Software Incompatibility With Suspension Control Module A

Where it lives

For U0321, start at the module the description names.

Check these first

• Software in the Suspension Control Module A that does not match the rest of the vehicle
• The Suspension Control Module A replaced without programming to the vehicle
• Corrupted or outdated calibration in the Suspension Control Module A
• A module programming step that did not complete

What to do next

1. Read stored codes on every module and note the mismatched part numbers
2. Record the software and calibration part numbers in the Suspension Control Module A
3. Reprogram the Suspension Control Module A with the latest calibration for the vehicle
4. Check for a service bulletin that covers the Suspension Control Module A software
5. Replace the Suspension Control Module A if programming will not complete
6. Clear the code and retest

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