U0199 — Lost Communication With Door Control Module A

Q: "What causes communication codes?"

"Usually a wiring issue, corroded connector, failed module, or dead battery. The CAN bus network connects all your car's computers."

Q: "Can a bad battery cause network codes?"

"Yes. Low voltage can cause communication failures between modules. Always check battery health first — it's the cheapest potential fix."

What Does U0199 Mean?

U0199 is a diagnostic trouble code indicating: Lost Communication With Door Control Module A. This code relates to the network communication system. It has been reported in NHTSA complaints across 2 different vehicle models.

Common Causes

🔍 Sensor or control module malfunction

U0199 Reports by Year

2020

1

2018

1

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"WHEN MY 2017 HONDA PILOT TOURING ENTERS IDLE STOP MODE, IT HAS BEGUN TO STALL WHEN YOU RELEASE THE BRAKE TO RE-ENGAGE THE ENGINE. THIS HAPPENED FIRST IN A PARKING LOT ON 6/17/20 WHEN LEAVING PARKING AREA TO ENTER MAIN ROAD. VEHICLE SHIFTS INTO NEUTRAL. MUST PUT IT INTO PARK. THEN HIT START BUTTON. T"
— Honda Pilot owner, 06/17/2020

"MY 2013 FORD FUSION IS EXPERIENCING AN ISSUE WITH THE CLIMATE CONTROL SYSTEM AND THE WINDOW CONTROLS. I HAVE LOST COMMUNICATION WITH THE 'FRONT CONTROL INTERFACE MODULE', 'DOOR CONTROL MODULE A', AND 'DOOR CONTROL MODULE B'. WHEN THIS HAPPENS, MY ECM DISPLAYS THE FOLLOWING CODES, P193E: A/C CLUTCH R"
— Ford Fusion owner, 07/30/2018

Source: NHTSA Complaints Database

Most Reported Vehicles for U0199

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	HONDA PILOT
2	FORD FUSION

Frequently Asked Questions

What causes communication codes?

Usually a wiring issue, corroded connector, failed module, or dead battery. The CAN bus network connects all your car's computers.

Can a bad battery cause network codes?

Yes. Low voltage can cause communication failures between modules. Always check battery health first — it's the cheapest potential fix.

What To Do Next

Possible Fixes

🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
🔧 Test the relevant sensor(s) with a multimeter before replacing
🔧 Check battery voltage and ground connections; inspect CAN bus wiring
🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

U0199: Lost Communication With Door Control Module A