U0502: Invalid Data Received From Door Control Module C

What it means

A control module received invalid data from door control module C. The code identifies a data validity fault; the specific affected function depends on the vehicle.

How it works

Door control module C manages door-related functions assigned to that module and sends status data to other modules. U0502 sets when a receiving module judges data from door control module C invalid; the letter C identifies the module, but its physical door assignment is vehicle-specific.

Common causes

Most likely first.

1. Fault in the transmitting module
2. Network wiring or connector fault
3. Module power or ground fault
4. Software or configuration mismatch

Symptoms

• One or more functions controlled by the affected door module may not work correctly
• Related communication codes or system warnings may appear

How to diagnose it

1. Save freeze-frame data and scan body modules to find which one reports invalid data from door control module C and whether communication faults accompany it.
2. Check the functions assigned to module C and compare their live status data with actual door, lock, or window operation.
3. Inspect module C's connector and door harness, especially the flexible wiring near the door hinge, for corrosion, loose terminals, moisture, or breaks.
4. Check module C's power and ground connections according to the manufacturer's procedure to rule out a supply problem.
5. If the network wiring and supply check out, verify module C's software and configuration, then test the module for an internal fault.

Common fixes

• Clean, dry, and secure the door control module C connector.
• Repair damaged wiring in module C's door harness.
• Fix a poor power or ground connection at module C.
• Correct an applicable software or configuration mismatch.
• Replace module C if testing confirms it is defective.

Can I keep driving?

Driving may be reasonable if the doors latch securely and the vehicle has no other warnings, but door functions assigned to module C can fail or behave intermittently. Confirm affected doors are closed and locked, and do not rely on faulty window or lock controls.