What it means
A module reports a software version mismatch with parking assist module B — typically after replacing one of the modules without programming the new unit to match the rest of the network.
How it works
A vehicle controller checks the software and configuration reported by parking assist control module B for compatibility with the rest of the vehicle network. U031E sets when module B's reported version or configuration does not match what the checking controller expects, often after a replacement or programming change.
Common causes
Most likely first.
- Module replaced without programming
- Wrong part number for the vehicle
- Gateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Scan all modules and preserve freeze-frame or event data, noting which controller logged U031E and any parking assist or communication codes.
- Check the service history for replacement, software updates, or configuration work involving parking assist control module B or related controllers.
- Inspect module B's connector and wiring for poor seating, corrosion, moisture, or physical damage that could interfere with network messages.
- Read module B's identity, software version, and configuration with a scan tool and compare these with the vehicle's required information.
- Review gateway and network records for faults specifically affecting messages to or from parking assist control module B.
- Apply the correct module software and configuration under the manufacturer's procedure, then rescan to confirm the fault does not return.
Common fixes
- Reconnect or repair a damaged or corroded connector at parking assist control module B.
- Program or configure a replacement parking assist module B to match the vehicle.
- Replace an incorrectly specified module with the correct compatible unit.
- Correct gateway routing or configuration if it is interfering with module B communication.
Can I keep driving?
If the fault is limited to parking assistance, drive cautiously and treat the affected parking sensors or alerts as unavailable. Do not rely on them when manoeuvring, and get the vehicle checked promptly if other warnings or functions are affected.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.