U0504: Invalid Data Received From Door Control Module E

What it means

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

How it works

Door control module E controls the door functions assigned to it and sends status messages to other modules. U0504 sets when a receiving module determines that data from door control module E is invalid; the code's letter does not specify the physical door on all vehicles.

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. Capture freeze-frame data and scan body modules for related communication faults to see which module detects invalid data from door control module E.
2. Review live data for module E and operate its assigned door functions, comparing reported lock, window, or door states with what the vehicle actually does.
3. Inspect module E's connector and harness for corrosion, moisture, loose pins, or broken wiring, including the section that flexes as the door opens.
4. Check module E's power and ground under the manufacturer's test procedure before suspecting the module.
5. If connections are sound, confirm the correct software and configuration are installed and test module E for an internal fault.

Common fixes

• Clean and secure a loose or corroded module E connector.
• Repair damaged door harness wiring associated with module E.
• Repair a poor power or ground connection to module E.
• Apply the correct software or configuration if a mismatch is found.
• Replace module E only if testing confirms failure.

Can I keep driving?

If affected doors close and secure normally, cautious driving is usually possible, but module E's assigned door functions may be unavailable or intermittent. Check door security before setting off and avoid using any faulty lock or window function while moving.