U027A

Lost Communication With Battery Charger Control Module C

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Problems starting the engine
Reduced efficiency of the start-stop system
Incorrect battery level readings
Error messages in the on-board computer

Causes

Open or short circuit in the communication circuit
Problems with power supply to the charging module
Malfunction of the charging module itself
Wiring Harness Problems
Corrosion of contacts or connectors

How to Fix

Check the integrity of the communication circuit between the ECU and the charging module
Check power supply and grounding of the module
Inspect connectors and contacts for corrosion
Scan the charging module for internal errors
If necessary, replace the battery charging module

Related codes

U027B U0279 U028A