VIN / Build Split
VIN pos 4-8 identifies series/body/engine. GM WMI: 1G1 (Chevy car), 1GC (Chevy truck), 3GN (Chevy SUV). Position 8 = engine code. Position 10 = model year code.
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2021 Chevrolet Tahoe Supported Services
2021 Chevrolet Tahoe
ADAS calibration, module programming, and security relearns
Multiple trim levels available. ADAS feature availability varies by trim and options package. Contact us for specific trim calibration requirements.
Technical snapshot
- Platform GMT T1XX (5th Gen Full-Size SUV)
- CAN Architecture GMLAN (HS-CAN + MS-CAN), Ethernet backbone on select modules; OBD2 DLC Pin 6/14 HS-CAN 500kbps
- Security GM PASS-Key III+ - BCM PKE passive entry, RKE 315MHz 128-bit rolling code; GDS2 + TIS2WEB for AKL
OVERVIEW
Expert ADAS calibration, module programming, and diagnostic recovery for the 2021 Chevrolet Tahoe. On this vehicle we cover documented systems include Forward Camera (Monocular), Forward Radar (77GHz), and Blind Spot Monitor Sensor - Left (BSM), this GMT T1XX (5th Gen Full-Size SUV) platform vehicle, GM PASS-Key III+ (T1XX Gen 3) immobilizer support, Chevrolet Infotainment 3 infotainment programming. Mobile across the DFW Metroplex; mail-in module work is temporarily unavailable.
Platform
GMT T1XX (5th Gen Full-Size SUV)
Production
2000-present
Trim Levels
Multiple trim levels available. ADAS feature availability varies by trim and options package. Contact us for specific trim calibration requirements.
Drivetrain
RWD / AWD / 4WD
Engine
-
CAN Speed
GMLAN (HS-CAN + MS-CAN), Ethernet backbone on select modules; OBD2 DLC Pin 6/14 HS-CAN 500kbps
YEAR-SPECIFIC NOTES
Infotainment
Chevrolet Infotainment 3
Exact-year service summary for 2021 Chevrolet Tahoe
ADAS coverage
This 2021 Chevrolet Tahoe page documents 7 ADAS systems, including Forward Camera (Monocular), Forward Radar (77GHz), Blind Spot Monitor Sensor - Left (BSM), and Blind Spot Monitor Sensor - Right (BSM).
View ADAS dataCalibration triggers
Documented calibration triggers include Windshield Replacement (Forward Camera Equipped), Forward Camera Replacement, Forward Radar (77GHz) Replacement, and Surround View Camera Replacement (any of 4). Use the ADAS tab for the full trigger list.
View triggersProgrammable modules
This page indexes 27 programmable module records across SRS, ECU, BCM, TCU/TCM, ABS, and IPC coverage.
View modulesGateway and security
This page includes 11 gateway, immobilizer, or key-security records for this 2021 Chevrolet Tahoe.
View securityCore Auto Logic capability
Core Auto Logic supports exact-year diagnostics, ADAS calibration, module programming, and security-access planning for the 2021 Chevrolet Tahoe using the documented systems and module data on this page.
Choose a sectionWhat changes on this exact year
Feature availability
GM Co-Pilot360: Forward Collision Alert/Automatic Emergency Braking, Lane Change - Available; Immobilizer: GM PASS-Key III+ (T1XX Gen 3) - Standard; Platform: GMT T1XX (5th Gen Full-Size SUV) - Confirmed
Driver-assist suite
GM Co-Pilot360: Forward Collision Alert/Automatic Emergency Braking, Lane Change Alert w/Blind Spot Monitoring, Rear Cross-Traffic Alert, HD Rear Camera, Front Camera Safety Package, Surround View (available), Super Cruise (High Country RPO KSG)
VIN and build split
VIN pos 4-8 identifies series/body/engine. GM WMI: 1G1 (Chevy car), 1GC (Chevy truck), 3GN (Chevy SUV). Position 8 = engine code. Position 10 = model year code.
Infotainment context
Chevrolet Infotainment 3; Chevrolet Infotainment 3 Premium - 10.2" touchscreen standard; 15" diagonal portrait display on High Country; Apple CarPlay + Android Auto
Network and access
CAN: GMLAN (HS-CAN + MS-CAN), Ethernet backbone on select modules; OBD2 DLC Pin 6/14 HS-CAN 500kbps
Tool access for this exact year
Representative tool access paths for this exact model year, gated by the vehicle data and source packet we currently trust.
Factory scan, coding, and calibration access
GM GDS2 / GM Tech2Win / GM MDI 2
Factory routines and secure server authorization control this path when aftermarket coverage is not enough for the VIN.
OEM subscription required
Make-level OEM tool map plus exact-year gateway and ADAS fields.
ADAS scan, setup, and verification
Autel, Launch Tech, Topdon
Used where aftermarket coverage supports the procedure; OEM software remains required for locked factory routines.
Tool subscription required
Service-level scanner-vendor source packet plus exact-year ADAS records.
Bench cloning and chip-level recovery
Alientech / Autotuner / Orange5 / Scanmatik / Flex / VVDI2 / PCMFlash / CGDI / X-Prog
Used only when the module, donor data, EEPROM, MCU, or crash-data workflow requires bench or chip-level handling.
Bench/chip-level only
Bench programmer source packet plus exact-year module/security records.
Choose a section to view data
SUPPORTED SYSTEMS
What we service on this vehicle
Documented module coverage for the 2021 Chevrolet Tahoe. Counts reflect modules our techs have programmed or calibrated on this exact platform.
ADAS Calibration
7 modules documented
Forward camera, radar, surround-view and lane-keep recalibration after windshield, suspension or fascia work.
Open ADAS tabEngine / ECU Programming
6 modules documented
Powertrain reprogramming, calibration updates, replacement ECU configuration and security access.
Open Modules tabBCM / Body Programming
4 modules documented
Body control module, gateway and accessory programming. Includes feature-bit reconfiguration.
Open Modules tabGateway / Security Access
6 modules documented
Secure gateway module identification, bypass workflow and security-access planning before programming.
Open Security tabTCU / Transmission
1 module documented
Transmission control module reprogramming, adaptive learning reset and replacement TCM clone.
Open Modules tabSRS / Airbag Reset
3 modules documented
Crash-data clear, hard-code reset and replacement airbag module configuration.
Open Modules tabABS / Brake Module
6 modules documented
ABS / EBCM bleed support, replacement module coding and yaw-rate sensor calibration.
Open Modules tabKey Security & Immobilizer
3 modules documented
Immobilizer modules, key/fob types, add-key + all-keys-lost (AKL) capability and security overview.
Open Security tabIPC, SAS & Other Modules
2 modules documented
Instrument cluster cloning, steering angle sensor calibration and other supporting modules.
Open Modules tabConnectivity & Accessories
5 modules documented
Infotainment radio, surround view, remote start, trailer brake controller and other equipped systems.
Open Modules tabRecalibration Triggers
16 modules documented
Service events that require ADAS recalibration on this vehicle. Tap to see what triggers what.
Open ADAS tabNeed something not listed? Most undocumented modules can still be programmed.
Get a QuoteFeature availability 3
GM Co-Pilot360: Forward Collision Alert/Automatic Emergency Braking, Lane Change
AvailableCalibration required after windshield replacement, camera/radar service, or structural repair affecting sensor alignment.
Immobilizer: GM PASS-Key III+ (T1XX Gen 3)
StandardKey programming requires manufacturer-level tool access.
Platform: GMT T1XX (5th Gen Full-Size SUV)
ConfirmedVerify platform code matches when cross-referencing part numbers across model years.
WHAT WE RESOLVE
Common issues on this vehicle
Common Chevrolet Tahoe issues we resolve on this platform: Forward Camera (Monocular), Forward Radar (77GHz), Blind Spot Monitor Sensor - Left (BSM), and Blind Spot Monitor Sensor - Right (BSM) recalibration after windshield/bumper/suspension/CCM service. Module programming for replacement ECU/PCM, BCM, TCU, or accessory modules - GMT T1XX (5th Gen Full-Size SUV) platform uses GMLAN (HS-CAN + MS-CAN), Ethernet backbone on select modules; OBD2 DLC Pin 6/14 HS-CAN 500kbps. Key programming and immobilizer faults - GM PASS-Key III+ (T1XX Gen 3) immobilizer; all-keys-lost supported.
ADAS CALIBRATION MATRIX
ADAS systems on this vehicle
GM Co-Pilot360: Forward Collision Alert/Automatic Emergency Braking, Lane Change Alert w/Blind Spot Monitoring, Rear Cross-Traffic Alert, HD Rear Camera, Front Camera Safety Package, Surround View (available), Super Cruise (High Country RPO KSG)
Scroll for part numbers and Details
| System | Type | Category | Cal. Type | Supported | Part # | Actions |
|---|---|---|---|---|---|---|
| Forward Camera (Monocular) | Camera | ADAS | Static | YES | 84394 (APPROX - VERIFY GMDB) | |
| Forward Radar (77GHz) | Radar | ADAS | Static + Dynamic | YES | 84277 (APPROX) | |
| Blind Spot Monitor Sensor - Left (BSM) | Radar | ADAS | Static + Dynamic | YES | 23234 (APPROX) | |
| Blind Spot Monitor Sensor - Right (BSM) | Radar | ADAS | Static + Dynamic | YES | 23234 | |
| Surround View Camera System (4-camera) | Camera | ADAS | Static | YES | 84 (EACH CAMERA - VERIFY GMDB) | |
| HD Rear Camera | Camera | ADAS | Static | YES | 84495 (APPROX) | |
| Super Cruise Camera/Sensor Suite (High Country RPO KSG) | Software | ADAS | None | YES | - |
ADAS SYSTEM
YES Supported
Identification
- System type
- Module category
- Sensor location
Part Numbers
- OEM
- Alternative
Calibration & Triggers
- Calibration type
- Programming approach
- Requires PMI
- Trigger events
Technical Notes
- Chip / MCU
- Service notes
Need this calibrated?
Get a quote for ADAS calibration WHEN IS CALIBRATION REQUIRED?
Triggers for ADAS recalibration
Windshield Replacement (Forward Camera Equipped)
Forward camera static calibration required via GDS2 after any windshield replacement. Level surface. GM-specified forward target chart at WSM distance. Camera and radar calibrated sequentially. Confirm FCA, AEB, Lane Change Alert all operational.
Forward Camera Replacement
GDS2 camera initialization + static calibration. Inspect windshield bracket - do not reuse damaged bracket. Confirm Forward Collision Alert and AEB functional.
Forward Radar (77GHz) Replacement
GDS2 radar alignment. Level surface, 10 ft front clearance, no metallic obstructions in radar FOV. Remove bumper fascia before confirming alignment complete.
Surround View Camera Replacement (any of 4)
All 4 surround view cameras must be recalibrated together. Calibration mat J-49878 required on flat, level surface per WSM placement diagram. GDS2 surround view calibration procedure. Partial calibration not acceptable.
BZA Rear Radar Replacement (either side)
GDS2 BZA module initialization. No physical aiming - fixed mount. Verify RCTA + BZA DTC clear. Road verify at 20+ mph both sides.
BCM Replacement
SPS programming (TIS2WEB) + VIN + all vehicle options (Surround View, Super Cruise RPO KSG, BSM, remote start, trailer, heated seats) + PASS-Key III+ key relearn with ALL keys present.
ECM Replacement (any engine)
SPS programming (TIS2WEB) + VIN + PASS-Key parameter transfer + idle/throttle relearn. L84: AFM adaptation reset. L87: DFM adaptation reset. LM2 diesel: DPF adaptation reset + DEF system check + injector calibration.
EBCM / ABS Module Replacement
GDS2 ABS/ESC initialization + 4-wheel brake bleed + steering angle sensor zero-point calibration. Drive straight at 35+ mph on level surface. StabiliTrak warning remains until SAS learning completes.
Steering Angle Sensor / Wheel Alignment
GDS2 SAS zero-point reset after alignment or SAS replacement. Drive straight at 35+ mph. StabiliTrak and LKAS may be limited until calibration completes.
Super Cruise System Service (High Country)
GDS2 Super Cruise initialization required after any sensor replacement. Active OnStar subscription must be verified. RPO KSG must be present in BCM. System requires LiDAR map coverage for operation.
Any Front-End Collision
Inspect and recalibrate forward camera after any front-end collision using GDS2/MDI2.
Front Bumper Repair or Replacement
Forward radar angular alignment required after front bumper R&R. Use GDS2/MDI2.
Forward Radar Replacement
Radar module replacement requires alignment/calibration using GDS2/MDI2.
Rear Bumper Repair or Replacement
BSD radar alignment required after rear bumper R&R. Use GDS2/MDI2.
BSM Sensor Replacement
Blind spot monitoring sensor replacement requires calibration using GDS2/MDI2.
Mirror Replacement
Surround view mirror camera recalibration required after mirror R&R. Use GDS2/MDI2.
SRS MODULES
SRS Modules
Sensing & Diagnostic Module (SDM) 13518546
- PART
- 13518546
- LOCATION
- Under center console
- MFG
- Continental
- NOTES
- Requires GM GDS2 / Tech2 or J2534 for SRS reset. DTC B0100 common after crash events. Wait 90 seconds after ignition off before disconnecting battery.
Sensing & Diagnostic Module (SDM) 84396838
- PART
- 84396838
- LOCATION
- Under center console
- MFG
- Continental
- NOTES
- Requires GM GDS2 / Tech2 or J2534 for SRS reset. DTC B0100 common after crash events. Wait 90 seconds after ignition off before disconnecting battery.
Sensing & Diagnostic Module (SDM) 84396837
- PART
- 84396837
- LOCATION
- Under center console
- MFG
- Continental
- NOTES
- Requires GM GDS2 / Tech2 or J2534 for SRS reset. DTC B0100 common after crash events. Wait 90 seconds after ignition off before disconnecting battery.
ECU MODULES
ECU Modules
ECM - L84 5.3L V8 EcoTec3 (standard engine) 12694 (APPROX - VERIFY GMDB BY VIN)
- PART
- 12694 (APPROX - VERIFY GMDB BY VIN)
- NOTES
- SPS programming via TIS2WEB. VIN tie required. PASS-Key III+ security parameter transfer from old ECM. AFM (Active Fuel Management) adaptation reset after ECM replacement. Cam phaser relearn via GDS2. Injector balance rate reset. Idle relearn procedure.
ECM - L87 6.2L V8 EcoTec3 (High Country / RST) 12697 (APPROX - VERIFY SUFFIX BY VIN)
- PART
- 12697 (APPROX - VERIFY SUFFIX BY VIN)
- NOTES
- SPS programming via TIS2WEB. VIN tie. DFM (Dynamic Fuel Management) cylinder deactivation adaptation reset. Cam phaser relearn. PASS-Key parameter transfer.
ECM - LM2 3.0L Duramax Diesel (if equipped) 12708 (APPROX - VERIFY GMDB BY VIN)
- PART
- 12708 (APPROX - VERIFY GMDB BY VIN)
- NOTES
- SPS programming via TIS2WEB. VIN tie + PASS-Key parameter transfer. DIESEL-SPECIFIC: DPF (Diesel Particulate Filter) adaptation reset required after ECM replacement. Injector return flow calibration. Glow plug module communication check. DEF system check via GDS2. Diesel ECM programming takes longer - allow extra SPS time on TIS2WEB.
TCM - 10L80 10-Speed Automatic 24285 (APPROX)
- PART
- 24285 (APPROX)
- NOTES
- GDS2 TCM quick learn procedure after replacement. Transmission adaptive shift data reset. SPS programming if required per RPO. Verify smooth shift quality through all 10 gears on road test.
EBCM (Electronic Brake Control Module) 84 (CONTINENTAL
- PART
- 84 (CONTINENTAL
- NOTES
- GDS2 ABS/StabiliTrak initialization + 4-wheel manual bleed sequence after replacement. Steering angle sensor calibration required post-replacement - GDS2 SAS reset + drive straight at 35+ mph.
IOR / Infotainment Module (10.2" or 15") 84 (VERIFY SCREEN SIZE VARIANT)
- PART
- 84 (VERIFY SCREEN SIZE VARIANT)
- NOTES
- GDS2 radio/IOR setup after replacement. RKE remote pairing via GDS2 if radio-integrated. 15" High Country unit is a different part number.
BCM MODULES
BCM Modules
Body Control Module (BCM) 84252 (APTIV SECURECONNECT GEN 3)
- PART
- 84252 (APTIV SECURECONNECT GEN 3)
- NOTES
- SPS programming via TIS2WEB required after replacement. Configure all vehicle options in BCM calibration (trailer, heated seats, remote start, BSM, Surround View, Super Cruise RPO KSG if equipped). VIN programming required. OTA module on 2021+ - verify connectivity after replacement.
Trailer Brake Control Module (if equipped) 23360 (APPROX)
- PART
- 23360 (APPROX)
- NOTES
- Integrated trailer brake controller. GDS2 configuration for trailer type and weight class. User gain adjustment via IOR infotainment interface.
HVAC Control Module 84 (VERIFY GMDB)
- PART
- 84 (VERIFY GMDB)
- NOTES
- Tri-zone or dual-zone auto climate. GDS2 HVAC actuator calibration after replacement. Verify all zones operational.
IPM (Integrated Power Module) 84
- PART
- 84
- NOTES
- Fuse/relay distribution. SPS programming if module-equipped variant. Verify all circuits post-replacement.
TCU / TCM TRANSMISSION MODULES
TCU / TCM Transmission Modules
TCU - 10L90 10-Speed Auto 84632
- PART
- 84632
- PROTOCOL
- J2534
- CODING
- Yes
- CLONE
- Yes
- CHIP/MCU
- Continental TC1797
- NOTES
- Requires transmission adaptive relearn via Tech2Win or GM MDI. Use Dexron VI ATF. VIN coding mandatory.
ABS / BRAKE MODULES
ABS / Brake Modules
Electronic Brake Control Module (EBCM) 84 (CONTINENTAL
- PART
- 84 (CONTINENTAL
- NOTES
- GDS2 ABS/ESC initialization. 4-wheel brake bleed (pressure bleed preferred) or GDS2 automated bleed sequence after HCU-integrated EBCM replacement. Steering angle sensor zero-point calibration required - GDS2 SAS reset, then drive straight at 35+ mph on level surface. StabiliTrak warning will remain until SAS learning completes.
Wheel Speed Sensor - Front Left 13512 (APPROX)
- PART
- 13512 (APPROX)
- NOTES
- Active magnetic sensor. Torque to spec.
Wheel Speed Sensor - Front Right 13512 (APPROX)
- PART
- 13512 (APPROX)
- NOTES
- Same procedure as front left.
Wheel Speed Sensor - Rear Left 13512 (REAR VARIANT - APPROX)
- PART
- 13512 (REAR VARIANT - APPROX)
- NOTES
- Rear axle-mounted. Same procedure.
Wheel Speed Sensor - Rear Right 13512 (REAR VARIANT - APPROX)
- PART
- 13512 (REAR VARIANT - APPROX)
- NOTES
- Same procedure.
Brake Pressure Modulator (HCU) 84 (VERIFY GMDB)
- PART
- 84 (VERIFY GMDB)
- NOTES
- GDS2 automated bleed sequence strongly preferred after HCU replacement. Verify firm pedal feel - no spongy pedal before road test.
OTHER MODULES (IPC, SAS)
Other Modules (IPC, SAS)
Instrument Panel Cluster (IPC) 85119382
- PART
- 85119382
- CLONE
- Yes
- NOTES
- IPC cloning required for mileage preservation during replacement. Use Launch advanced programming tool or EEPROM programming tool for EEPROM read/write.
Steering Angle Sensor (SAS)
- CODING
- Yes
- NOTES
- INTEGRATED (SCM clock spring)
CONNECTIVITY & ACCESSORIES
Connectivity & Accessories
OnStar Module 84 (VERIFY GMDB)
- PART
- 84 (VERIFY GMDB)
- NOTES
- GDS2 OnStar initialization. Active OnStar subscription required for full remote features, Super Cruise, and OTA updates. Modem VIN-tied - replacement requires GDS2 + OnStar reactivation.
Trailer Brake Controller (integrated) 23360 (APPROX)
- PART
- 23360 (APPROX)
- NOTES
- GDS2 configuration for trailer type/weight. 7-pin and 4-pin trailer connector verification. IOR gain adjustment interface.
Remote Start (OEM RKE-based) (BCM PARAMETER - RPO UF8, AP9)
- PART
- (BCM PARAMETER - RPO UF8, AP9)
- NOTES
- BCM AsBuilt parameter for remote start enable. GDS2 BCM configuration. OEM remote start via RKE 315MHz fob sequence. Verify with original key fob.
Power Running Boards (if equipped) OEM GM (84)
- PART
- OEM GM (84)
- NOTES
- BCM controls power boards. GDS2 BCM calibration if boards are non-responsive after BCM replacement.
Power Liftgate / Power Rear Door
- NOTES
- GDS2 power liftgate module initialization after replacement. Height adjustment via IOR. Verify obstruction detection.
GATEWAY / SECURITY MODULES
Gateway / Security Modules
Central Gateway Module
- MFG
- Renesas
- SECURITY
- VIN-locked (UDS)
- VIN LOCKED
- Yes
- CODING
- Yes
- CHIP/MCU
- D70F3585
- NOTES
- Compatibility label: Chevrolet. Air conditioning Notes: Read/Write
Central Gateway Module
- MFG
- Renesas
- SECURITY
- VIN-locked (UDS)
- VIN LOCKED
- Yes
- CODING
- Yes
- CHIP/MCU
- D70F3558
- NOTES
- Compatibility label: Buick. BCM Notes: Read/Write
Central Gateway Module
- MFG
- Various / Unlisted
- SECURITY
- VIN-locked (UDS)
- VIN LOCKED
- Yes
- CODING
- Yes
- CHIP/MCU
- 1M12S
- NOTES
- Compatibility label: CRUZE. BCM Notes: Years: 2015-
Central Gateway Module
- MFG
- Various / Unlisted
- SECURITY
- VIN-locked (UDS)
- VIN LOCKED
- Yes
- CODING
- Yes
- CHIP/MCU
- 1M12S
- NOTES
- Compatibility label: Cavalier. BCM Notes: Years: 2015-
Central Gateway Module
- MFG
- Various / Unlisted
- SECURITY
- VIN-locked (UDS)
- VIN LOCKED
- Yes
- CODING
- Yes
- CHIP/MCU
- 1M12S
- NOTES
- Compatibility label: Excelle. BCM Notes: Years: 2015-
Central Gateway Module
- MFG
- Various / Unlisted
- SECURITY
- VIN-locked (UDS)
- VIN LOCKED
- Yes
- CODING
- Yes
- CHIP/MCU
- 1M12S
- NOTES
- Compatibility label: SAIL. BCM Notes: Years: 2015-
KEY SECURITY & IMMOBILIZER
Key Security & Immobilizer
- System GM PASS-Key III+ (T1XX Gen 3)
- Add Key Yes
- All Keys Lost Yes
GM PASS-Key III+ - BCM PKE passive entry, RKE 315MHz 128-bit rolling code; GDS2 + TIS2WEB for AKL
IMMOBILIZER MODULES
Immobilizer Modules
PassKey III+ Immobilizer
- NOTES
- GM PASS-Key III+ with PKE passive entry. GDS2 + TIS2WEB for add key or AKL. No pin code extraction via OBD. Dealer authorization required for AKL via TIS2WEB.
PassKey III+ Immobilizer 84252 (APTIV)
- PART
- 84252 (APTIV)
- NOTES
- SPS programming (TIS2WEB) + key relearn with ALL customer keys present mandatory.
ECM (PASS-Key Security Seed) 12694, 12697, 12708
- PART
- 12694, 12697, 12708
- NOTES
- ECM paired to BCM for PASS-Key III+ security. SPS programming after ECM replacement includes security parameter transfer. No standalone relearn without TIS2WEB.
KEY & FOB TYPES
Key & Fob Types
Proximity Smart Key Fob 13508771 (315MHZ - VERIFY CURRENT GM PART NUMBER)
- PART
- 13508771 (315MHZ - VERIFY CURRENT GM PART NUMBER)
- NOTES
- 315MHz RKE + passive entry (PKE). 128-bit rolling code. GDS2 + TIS2WEB dealer authorization for add key or AKL. Rolling code resync via GDS2 if key desynchronized after battery replacement. Battery: CR2032. Max keys per vehicle: verify BCM config - typically 8.
Remote Start Key Fob
- NOTES
- Factory remote start fob. GDS2 BCM pairing procedure. Verify remote start function after pairing.
Replacement Notes
BCM replacement requires SPS programming (TIS2WEB) + PASS-Key III+ relearn with all customer keys present. ECM replacement: SPS programming + VIN tie + PASS-Key parameter transfer. No key pin extraction via OBD. AKL: GDS2 + TIS2WEB dealer authorization required. Diesel ECM additionally requires DPF adaptation reset.
ARCHITECTURE & CONNECTIVITY
Architecture & Connectivity
- Body Construction
- Body-on-frame; high-strength steel ladder frame; SUV body
- OBD Protocol
- ISO 15765-4 CAN (500 kbps HS-CAN)
- CAN Architecture
- GMLAN (HS-CAN + MS-CAN), Ethernet backbone on select modules; OBD2 DLC Pin 6/14 HS-CAN 500kbps
- Infotainment
- Chevrolet Infotainment 3 Premium - 10.2" touchscreen standard; 15" diagonal portrait display on High Country; Apple CarPlay + Android Auto
- OTA Capable
- Yes
- Infotainment Name
- Chevrolet Infotainment 3
- ECU/TCM Unlocking
- Contact us
- ECU/TCM Flashing
- Confirmed
Reviewed coverage: 2021 - 5.3L V8 EcoTec III 16v (L84), 6.2L Ecotec III V8 (L87).
Confirm the exact engine, ECU, and any prerequisite access method before service.
OPENPILOT / COMMA.AI
Openpilot Compatibility
Not Supported
Not supported - tahoe not in openpilot support tree
Not in openpilot support tree as of April 2026.
FREQUENTLY ASKED QUESTIONS
FAQ
How much does ADAS calibration cost for a 2021 Chevrolet Tahoe?
ADAS calibration pricing for a 2021 Chevrolet Tahoe depends on which of its 7 documented systems need work after a repair. This vehicle is documented with Forward Camera (Monocular), Forward Radar (77GHz), Blind Spot Monitor Sensor - Left (BSM), Blind Spot Monitor Sensor - Right (BSM), and Surround View Camera System (4-camera). We provide a fixed quote after confirming the operations performed - send the VIN, the repair scope (windshield R&R, bumper work, alignment, collision), and any DTCs so the quote response can include a real number.
Can you reset the airbag light on a 2021 Chevrolet Tahoe?
Yes. The 2021 Chevrolet Tahoe uses a factory SRS control module that we support. We read and clear stored crash data, then restore the module to factory status so the airbag warning light goes out and the system returns to full operation. Reference part number on this vehicle: 13518546. Mobile diagnosis and programming are the active service path. Mail-in bench intake is temporarily unavailable. Send the part number and a description of what triggered the light, and we will provide a quote and scheduling window.
What is needed after replacing the windshield on a 2021 Chevrolet Tahoe?
After windshield replacement on a 2021 Chevrolet Tahoe, Forward Camera (Monocular), Forward Radar (77GHz), Surround View Camera System (4-camera), HD Rear Camera, and Super Cruise Camera/Sensor Suite (High Country RPO KSG) rely on the forward-facing camera and require recalibration before the systems return to operation. We perform the calibration on-site in the DFW Metroplex with OE target fixtures. Mail-in intake is temporarily unavailable.
How long does a 2021 Chevrolet Tahoe module service take?
Most 2021 Chevrolet Tahoe onsite jobs are typically scheduled within 24-48 hours once vehicle readiness, access, and route timing are confirmed. This vehicle has roughly 33 programmable modules documented in our database (6 ECU, 4 BCM, 1 TCU, 6 ABS, plus IPC/SAS/gateway/accessory). Mobile module work and ADAS calibration are scheduled in the DFW service area after quote review. Mail-in module intake is temporarily unavailable.
Do you cover the 2021 Chevrolet Tahoe on-site, or is this mail-in only?
We run a mobile unit across the DFW Metroplex for on-vehicle work (ADAS calibration, key programming, IMMO pairing, post-repair recoding, and supported module work). Mail-in module intake is temporarily unavailable. Quote the work and we will confirm the active service path for the 2021 Chevrolet Tahoe. Do not ship a module unless support confirms next steps.
What kind of warranty do you offer on 2021 Chevrolet Tahoe programming?
Every programming, cloning, and calibration job on the 2021 Chevrolet Tahoe is backed by a workmanship warranty covering the scope of work we performed: 1-year unlimited on all flashes, clones, and ADAS calibrations. If a module we programmed or a calibration we performed fails to function as expected, return it and we restore it at no charge. The warranty covers our work; it does not cover unrelated mechanical or electrical failure of the module itself.
Can you program a 2021 Chevrolet Tahoe with no working keys (all-keys-lost)?
Yes - all-keys-lost is supported on the 2021 Chevrolet Tahoe. Immobilizer generation on this platform: GM PASS-Key III+ (T1XX Gen 3). Adding a key (with a working key already in hand) is also supported - typically faster and less expensive than an all-keys-lost reset. Submit the VIN and we will confirm the procedure and quote before scheduling.
Which modules on a 2021 Chevrolet Tahoe can you actually service?
We program, clone, repair, or replace the full programmable-module stack on a 2021 Chevrolet Tahoe. For this vehicle our database documents:
- 6 engine control (ECU/PCM)
- 1 transmission control (TCU/TCM)
- 4 body control (BCM and related)
- 6 ABS / brake control (EBCM)
- 3 immobilizer / security
- 2 key & fob
- 1 instrument cluster (IPC)
- 1 steering angle sensor (SAS)
- 7 ADAS module
Infotainment on this platform: Chevrolet Infotainment 3. Send the VIN and the operations performed and we will confirm support and pricing.
OTHER CHEVROLET MODELS
Additional Module Part Numbers
Additional OEM-sourced part numbers for the 2021 Chevrolet Tahoe covering ADAS, ECU/PCM, BCM, TCU/TCM, SRS, ABS/EBCM, instrument cluster (IPC), gateway, and steering angle sensor modules when available. These reference numbers assist technicians with module identification and sourcing prior to programming.
- ADAS Module Part Numbers
- 84394, 84277, 23234, 84, 84495
- ECU / PCM Part Numbers
- 12694, 12697, 12708
- BCM / Body Module Part Numbers
- 84252 (APTIV SECURECONNECT GEN 3), 23360 (APPROX), 84 (VERIFY GMDB), 84
- TCU / TCM Part Numbers
- 84632
- SRS / Airbag Module Part Numbers
- 13518546, 84396838, 84396837
- ABS / EBCM Part Numbers
- 84528
- Instrument Cluster (IPC) Part Numbers
- 85119382
- Transmission Control Module (TCM) Part Numbers
- 84632
Part numbers are OEM base references. Verify exact suffix via VIN-specific build data before ordering. Core Auto Logic provides mobile programming services for all listed modules in the DFW area.
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Shared module fitment
Vehicles sharing modules with the 2021 Chevrolet Tahoe
These vehicles use one or more of the same replacement modules indexed for this vehicle.