U007F

Control Module Communication Bus M Off

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$17–167 (est.)

Symptoms

Check engine light comes on
Disconnection or incorrect operation of vehicle systems
Problems starting the engine
Lost connection with diagnostic equipment
Spontaneous switching on/off of electronic systems

Causes

Open or short circuit in the CAN bus
Malfunction of one of the control modules
Poor contact in CAN bus connectors
Problems with module power supply
Corroded or damaged wiring

How to Fix

Check the integrity of the CAN bus wiring
Diagnose control modules for faults
Check CAN bus connections and connectors
Test the power supply and mass of the modules
Update module software (if required)

Related codes

U007D U007E U0080 U0081