U0421

Invalid Data Received From Suspension Control Module A

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine Light Is On
Incorrect suspension operation
Reduced riding comfort
Errors in other systems
Additional fault codes appear

Causes

Problems with wiring to the suspension module
Suspension control module malfunction
Bad contacts in connectors
Software errors in the module
Problems with the CAN bus

How to Fix

Check connections and wiring to suspension module
Scan all modules for additional errors
Update suspension module software
Check power supply and grounding of the module
Replace suspension control module if necessary

Related codes

U0422 U0401 U0121