U012D

Lost Communication With Generator A Control Module

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine Light Is On
Irregular battery charging
Reduced generator efficiency
Possible voltage fluctuations in the on-board network

Causes

Broken or damaged wires between the ECM and the generator
Generator control module malfunction
Poor connection in connectors
Generator module power supply problems
Malfunction of the generator itself

How to Fix

Check the integrity of wiring and connectors
Diagnose the generator control module
Check the power and ground of the generator module
If necessary, replace the generator control module
Check the operation of the generator itself

Related codes

U012E U012C U012B