High-Voltage System Modules: what it does and what each make calls it

What does this module do?

This heading covers the high-voltage side of electric and hybrid vehicles: DC-DC converter, inverter, power distribution and safety monitoring units. High-voltage systems are not open to unauthorised intervention; this page only describes what the modules are and how they appear in the address map.

What do the makes call this module?

The name of a module doing the same job changes from make to make. The names below are the actual definition names used under this type in the CarCoding scan map (110 distinct names):

Module name	Address
48V Belt Starter Generator	`18DA55F1`
AHCP (29-bit)	`18DA12F1`
Air Coolant Actuator 1	`17FC16EF`
Air Coolant Actuator 1	`17FC16EF`
Air Coolant Actuator 2	`17FC16F0`
Air Coolant Actuator 2	`17FC16F0`
Air Coolant Actuator 3	`17FC16FB`
Air Coolant Actuator 3	`17FC16FB`
Auxiliary Hybrid Control	`76C`
Auxiliary Hybrid Control Processor	`76C`
Battery Charger	`744`
Battery Charger	`744`
Battery Heater/Cooler Box	`6C4`
CDU	`797`
CSHV High-Voltage Safety	`78A`
Coolant Pump 1	`17FC1789`
Coolant Pump 1	`17FC1789`
Coolant Pump 2	`17FC178A`
Coolant Pump 2	`17FC178A`
Coolant Pump 3	`17FC178B`
Coolant Pump 3	`17FC178B`
Coolant Pump 4	`17FC178C`
Coolant Pump 4	`17FC178C`
Coolant Valve	`17FC1727`
Coolant Valve	`17FC1727`
Coolant Valve 1	`17FC1747`
Coolant Valve 1	`17FC1747`
Coolant Valve 2	`17FC1748`
Coolant Valve 2	`17FC1748`
Coolant Valve 3	`17FC1749`
Coolant Valve 3	`17FC1749`
Coolant Valve 4	`17FC174A`
Coolant Valve 4	`17FC174A`
Coolant Valve 5	`17FC1751`
Coolant Valve 5	`17FC1751`
Coolant Valve 6	`17FC1752`
Coolant Valve 6	`17FC1752`
Coolant Valve 7	`17FC1753`
Coolant Valve 7	`17FC1753`
Coolant Valve 8	`17FC1754`
Coolant Valve 8	`17FC1754`
Coolant heating (MEB/EVO)	`17FC16C0`
Coolant heating (MEB/EVO)	`17FC16C0`
DC-DC Converter	`746`
DC-DC Converter (MEB)	`17FC00B9`
DC-DC Converter (MEB)	`17FC00B9`
DC-DC Converter / Supervisor	`756`
DC-DC Supervisor	`18DADDF1`
DC/DC Converter	`72A`
DCDC	`746`
DCDC	`746`
DCDC	`785`
DCDC (DC/DC Converter)	`746`
DCVDM	`702`
DMCU	`72E`
Direct Current to Direct Current Converter	`753`
Drive Motor 2	`743`
Drive Motor 2	`743`
Drive Motor Control Module	`7E6`
Drive Motor Control Module	`7E6`
Drive Motor Control Module (DMCM) (29-bit)	`14DA17F1`
Drive Motor Control Module 2 (DMCM2) (29-bit)	`14DA1DF1`
Drive Motor Converter	`741`
Drive Motor Converter	`741`
Drive/Vehicle Control (MEB)	`17FC0076`
Drive/Vehicle Control (MEB)	`17FC0076`
EHVC	`766`
EV Control Module (EVC)	`18DADAF1`
EV Control Module / SCR	`7E4`
Electric compressor (MEB/EVO)	`17FC170D`
Electric compressor (MEB/EVO)	`17FC170D`
Electric drive 2 (MEB/EVO)	`17FC00B8`
Electric drive 2 (MEB/EVO)	`17FC00B8`
Electro-engine (MEB/EVO)	`17FC007C`
Electro-engine (MEB/EVO)	`17FC007C`
FCV Fuel Cell (29-bit)	`18DA07F1`
Front Electric Power Inverter Converter	`747`
GMCU (Drive Motor)	`787`
HCP (Hybrid Control Processor)	`7E1`
HCP Hybrid Control (29-bit)	`18DA4BF1`
HV Motor	`18DA02F1`
HV Starter Generator	`18DAE3F1`
HV converter 2 (MEB/EVO)	`17FC00C7`
HV converter 2 (MEB/EVO)	`17FC00C7`
High voltage converter (MEB/EVO)	`17FC00B7`
High voltage converter (MEB/EVO)	`17FC00B7`
Hybrid Control (HCP)	`7E2`
Hybrid Control (KWP)	`7E2`
Hybrid Control (UDS)	`7D2`
Hybrid Control Processor	`7E2`
Hybrid Control Unit 1	`6A7`
Hybrid Control Unit 2	`6A6`
Hybrid Motor Control	`7E3`
Hydrogen Fuel Cell ECU	`18DA1DF1`
Inverter / Motor Controller	`784`
Inverter INV-ME (29-bit)	`18DADFF1`
Inverter control	`782`
LDC	`763`
LDC (DC-DC Converter)	`7C5`
MCPB Motor Control B (29-bit)	`18DA15F1`
MCU	`712`
MCU	`771`
MCU	`7F0`
MCU (Drive Motor)	`7E3`
MCU (Drive Motor)	`7E3`
MCU (Drive Motor) / EPS	`730`
MCU (Motor Inverter)	`7E3`
MCU/Front drive MCU/EDCM/VTOG_DSP2	`780`
MCU/P2M	`789`
MCU/Rear drive MCU	`785`
Main Inverter (INV-ME)	`18DADFF1`
Motor / Inverter	`725`
Motor Generator	`716`
Motor Generator 2	`724`
OBCC	`7D1`
Oil Pump Coolant Axle 1	`17FC17B3`
Oil Pump Coolant Axle 1	`17FC17B3`
Oil Pump Coolant Axle 2	`17FC17B4`
Oil Pump Coolant Axle 2	`17FC17B4`
PDM	`741`
PIM / Motor Control (Ultium)	`7E6`
Power Converter	`6BA`
Power Converter 2	`49B`
Power Electronic Box	`75A`
Primary Motor / Inverter	`7E6`
Rear Electric Power Inverter Converter	`746`
Rear Inverter 1	`18DAE5F1`
Rear Inverter 2	`18DAEAF1`
Rear Left Inverter	`18DAE9F1`
SGCM (EPICC)	`7E7`
SOBDM (BCCM)	`7E2`
Secondary Motor	`7E7`
Sensor High Voltage System 1	`17FC1732`
Sensor High Voltage System 1	`17FC1732`
Sensor High Voltage System 2	`17FC175A`
Sensor High Voltage System 2	`17FC175A`
Separated Starter Generator	`18DA14F2`
Starter Generator Control Module Sub	`17FC16E8`
Starter Generator Control Module Sub	`17FC16E8`
Starter generator (MEB/EVO)	`17FC0085`
Starter generator (MEB/EVO)	`17FC0085`
VCU	`711`
VCU	`742`
VCU	`743`
VCU	`7E3`
VCU	`7E6`
VCU #1 (29-bit)	`1DD01602`
VCU (Vehicle Control)	`7E3`
VCU / BMS	`78B`
VMCU / VCU	`7E2`
Vehicle Control Module	`797`
Vehicle Control Unit	`7E3`
Vehicle Control Unit (EV)	`6A2`

Which makes define it?

The map holds 153 definitions for this type, spread across 26 make groups:

Address and protocol

Every definition in the map is marked as UDS. 74 of the addresses are 11-bit CAN identifiers (three digits, such as 7E0) and 79 are 29-bit extended identifiers (such as 18DA10F1). The most frequent addresses for this type are: 7E3 (7), 746 (5), 7E2 (5), 7E6 (5).

An address being defined in the map does not mean the module can be read on every vehicle. Reaching modules outside the mandatory OBD-II emissions channel depends on the manufacturer protocol and on the vehicle itself.

Other module types

← All ECU modules

High-Voltage System Modules on your own vehicle

With an ELM327-based BLE OBD2 adapter, CarCoding scans the vehicle’s modules, reads fault codes from those it can reach and explains every code in plain language. Which modules are reachable depends on the make and on the vehicle. The app is free to download.

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Some advanced features require an in-app purchase.

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.