U0438

Invalid Data Received From Trailer Brake Control Module

Severity

⚠️ Medium

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
No response from trailer brakes
Incorrect operation of trailer brakes
Errors in the braking system on the dashboard

Causes

Trailer brake control module malfunction
Damage to the wiring harness to the trailer module
Poor contact in connectors
Software error in trailer module
Problems with power supply to the trailer module

How to Fix

Check the integrity of the wiring harness to the trailer module
Inspect and clean the connector contacts
Check the power and ground of the trailer module
Test or replace trailer brake control module
Update trailer module software

Related codes

U0437 U0439 U0440