GM ECU Modules and Addresses

Observations from the map

The GM map ranks 16 with 41 definitions; the largest module types are: ecu_module (13), steering module (4), high-voltage system modules (3).

24 of the addresses use 11-bit CAN identifiers and 17 use 29-bit identifiers. 1 definitions have scan priority 1; priority decides which module a scan starts from.

The map contains 5 safety-critical module definitions (ABS/brakes and airbag). Opening a diagnostic session on these can turn on a warning lamp; the vehicle must not be driven during the operation.

Modules in the map

Module name	Type	Address	Response	Priority
ECM (Engine)	Engine Control Unit	`7E0`	`7E8`	1
TCM (Transmission)	Transmission Control Unit	`7E2`	`7EA`	2
EBCM (ABS / StabiliTrak) safety-critical	ABS / ESP Module	`243`	`643`	3
SDM (Airbag) safety-critical	Airbag / SRS Module	`247`	`647`	4
IPC (Instrument Cluster)	Instrument Cluster	`24C`	`64C`	5
BCM (Body Control)	Body Control Module	`241`	`641`	6
HVAC (Climate)	Climate Control Module	`251`	`651`	7
Radio / EHU	Audio / Multimedia Module	`244`	`644`	8
HCP (Hybrid Control Processor)	High-Voltage System Modules	`7E1`	`7E9`	9
AOS (Occupant Sensing) safety-critical	Airbag / SRS Module	`245`	`645`	20
VCIM (OnStar)	Telematics Module	`24D`	`64D`	21
APA/UPA (Park Assist)	Park Assist Module	`259`	`659`	22
HMI / ETRS	—	`252`	`652`	23
EPS / TDM	Steering Module	`242`	`642`	24
Parking brake safety-critical	Brake Control Module	`254`	`654`	25
SIC	—	`246`	`646`	26
AHL/AFL	—	`249`	`649`	27
Continuous Damping Control	—	`24B`	`64B`	28
Drive Motor Control Module (DMCM) (29-bit)	High-Voltage System Modules	`14DA17F1`	`142AF117`	29
Drive Motor Control Module 2 (DMCM2) (29-bit)	High-Voltage System Modules	`14DA1DF1`	`142AF11D`	30
Brake system (BSCM/ABS) (29-bit) safety-critical	ABS / ESP Module	`14DA28F1`	`142AF128`	31
Rear wheel steering control (29-bit)	Steering Module	`14DA32F1`	`142AF132`	32
Power steering control module 1 (PSCM1) (29-bit)	Steering Module	`14DA31F1`	`142AF131`	33
Power steering control module 2 (PSCM2) (29-bit)	Steering Module	`14DA35F1`	`142AF135`	34
Battery control module (BECM2) (29-bit)	—	`14DACBF1`	`142AF1CB`	35
Battery control module 2 (BECM2) (29-bit)	—	`14DACDF1`	`142AF1CD`	36
Engine control unit (29 bit) (29-bit)	Engine Control Unit	`14DA11F1`	`142AF111`	37
Transmission control unit (29 bit) (29-bit)	Transmission Control Unit	`14DA18F1`	`142AF118`	38
Transfer case (29 bit) (29-bit)	AWD / Transfer Case Module	`14DA1AF1`	`142AF11A`	39
CCMA (29 bit) (29-bit)	—	`14DA13F1`	`142AF113`	40
BCM (29 bit) (29-bit)	Body Control Module	`14DA40F1`	`142AF140`	41
LCM (29 bit) (29-bit)	—	`14DA41F1`	`142AF141`	42
DMSM (29 bit) (29-bit)	—	`14DA6AF1`	`142AF16A`	43
Front view camera - windshield (29 bit) (29-bit)	Camera Module	`14DABDF1`	`142AF1BD`	44
Gear shift control module (29 bit) (29-bit)	Transmission Control Unit	`14DA46F1`	`142AF146`	45
Powertrain (OBD)	—	`7E3`	`7EB`	46
Powertrain (OBD)	—	`7E4`	`7EC`	47
Powertrain (OBD)	—	`7E5`	`7ED`	48
Powertrain (OBD)	—	`7E6`	`7EE`	49
HV Battery (Bolt cells)	High-Voltage Battery Module	`7E7`	`7EF`	50
Module	—	`726`	`72E`	51

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Data source: the CarCoding ECU scan map (ecuDatabase.ts). The addresses and names in the table are definitions from the map; they can differ depending on the hardware and software version in your vehicle.

Disclaimer: This page offers general information and does not replace an inspection by a qualified workshop. Any work carried out on the vehicle is your own responsibility.