U0421
Invalid Data Received From Suspension Control Module A
U0421 is an OBD-II diagnostic trouble code meaning: Invalid Data Received From Suspension Control Module A. Common causes: problems with wiring to the suspension module, suspension control module malfunction. Estimated repair cost: $56–278.
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
Error U0421 by Vehicle Brand
FAQ
What does the U0421 code mean?
U0421 is an OBD-II diagnostic trouble code that indicates: Invalid Data Received From Suspension Control Module A
What causes a U0421 error code?
The most common causes of U0421 include: Problems with wiring to the suspension module; Suspension control module malfunction; Bad contacts in connectors; Software errors in the module.
How do I fix a U0421 diagnostic trouble code?
To fix U0421: Check connections and wiring to suspension module. Scan all modules for additional errors. Update suspension module software. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0421?
Yes, but get it checked soon
How much does it cost to fix U0421?
The estimated repair cost for U0421 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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