U0201

Lost Communication With Door Control Module C

Q: Is it safe to drive with U0201?

Yes. Only that door's power features (window, lock, mirror) are affected. Confirm the door can still lock and latch, and the car is fine to drive.

Q: Can I just clear U0201?

It returns while the module stays offline. The wiring — usually in the flexing door-jamb harness — or the module itself needs repair.

Communication network (door module) Generic OBD-II Low

What it means

U0201 means the network has lost communication with door control module C, the unit that runs one door's power window, lock, and mirror. With it offline those features on that door stop working, often because the wiring in the flexing door-jamb harness has broken. The car drives normally and the fix is usually a harness or connector repair at that door.

Low

Can I keep driving? Yes — one door's power features may not work, but the car drives normally. Just make sure that door still locks manually.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Power window, lock, or mirror on that door dead or intermittent
Door control module C unreachable when scanned
Possible warning message for that door's functions
No effect on how the engine or brakes drive

Common causes

Most likely first

Open, shorted, or chafed wiring in the door jamb harness (flexes every time the door opens)Likely
Corroded or loose connector at the door moduleCommon
Blown fuse or lost power/ground to the moduleCommon
Failed door control moduleLess often
Bus fault preventing the module from reportingLess often

How to diagnose & fix

Work through it in order

Scan all modules and confirm door module C is offline.
Inspect the door-jamb harness boot where wires flex for breaks or chafing.
Check the module's power, ground, and fuse feeds.
Test the connector and bus lines at the door module for open or short.
If wiring and power are good, replace the door control module, clear the code, and confirm the door's features work.

FAQ

Quick answers

Is it safe to drive with U0201?+

Yes. Only that door's power features (window, lock, mirror) are affected. Confirm the door can still lock and latch, and the car is fine to drive.

Can I just clear U0201?+

It returns while the module stays offline. The wiring — usually in the flexing door-jamb harness — or the module itself needs repair.

Read & clear U0201 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX