U0420

Invalid Data Received From Power Steering Control Module A

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–111 (est.)

Symptoms

Check engine light is on
Increased steering effort
Intermittent operation of the electric power steering
Loss of parking assistance functions

Causes

EPS control module malfunction
Problems with wiring or connectors
EPS module power problems
CAN bus fault
Software error in EPS module

How to Fix

Check EPS module fault codes
Inspect EPS module connectors and wiring
Check the power and ground of the EPS module
Check communication via CAN bus
Update EPS module software

Related codes

U0421 U0422 C0561