U0200

Lost Communication With Door Control Module B

Q: Is it safe to drive with U0200?

Yes — the car runs normally. You may just lose power window, lock, or mirror function on that door until it's fixed.

Q: Can I just clear U0200?

You can, but it returns unless the module's power, ground, wiring (often a broken door-jamb wire), or the unit itself is repaired.

Communication network (body) Generic OBD-II Low

What it means

U0200 means the network has lost communication with door control module B — the unit that runs a door's powered features like the window, lock, and mirror. It doesn't affect how the car drives; the main symptom is that door's controls not working. A common cause is a broken wire in the door-jamb harness where it flexes each time the door opens.

Low

Can I keep driving? Safe to drive — this affects a door's powered features (window, lock, mirror). It doesn't change how the car runs, though a door's controls may not work.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of U0200 scans

U0199in 71.2% of scans

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 the affected door not working
Warning message about a door or body-control feature
Door control module B not responding to a scan tool
Intermittent operation of that door's controls

Common causes

Most likely first

Loss of power or ground to door control module BLikely
Blown fuse feeding the moduleCommon
Broken or corroded wiring in the door jamb harness (a common flex point)Common
Loose or corroded connectors, or water intrusion in the doorLess often
Failed door control moduleLess often

How to diagnose & fix

Work through it in order

Scan all modules and confirm door control module B is unreachable.
Check battery voltage and the module's fuse, power, and ground feeds first.
Inspect the door-jamb harness where it flexes between the body and door for broken wires.
Check the module's connectors for corrosion, looseness, or water intrusion.
If power, grounds, and wiring are good, suspect the module — replace and program it as required, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with U0200?+

Yes — the car runs normally. You may just lose power window, lock, or mirror function on that door until it's fixed.

Can I just clear U0200?+

You can, but it returns unless the module's power, ground, wiring (often a broken door-jamb wire), or the unit itself is repaired.

Read & clear U0200 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