AutoCodes – Generic – U0199

U0199 Code - Lost Communication With Door Control Module 'A'

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Door Control Module 'A', Door Control Module 'A' harness is open or shorted, Door Control Module 'A' circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U0199 indicates Lost Communication With Door Control Module 'A'.
Common causes: Common causes include Faulty Door Control Module 'A', Door Control Module 'A' harness is open or shorted, Door Control Module 'A' circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 24,139

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U0199 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Door Control Module 'A' has not been received.

OBDII Code U0199 - Lost Communication With Door Control Module 'A' - AutoCodes.com — U0199 Code - Lost Communication With Door Control Module 'A'

What does this mean?

What are the Possible Causes of the DTC U0199?

Faulty Door Control Module 'A'
Door Control Module 'A' harness is open or shorted
Door Control Module 'A' circuit poor electrical connection

How to Fix the DTC U0199?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0199 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U0199 code?

Need more information on how to fix the U0199 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0199 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0199 Acura — Immobilizer-Keyless Control Unit Lost Communication With Door Multiplex Control Unit
U0199 Chrysler — Lost Communication With Door Control Module
U0199 Dodge — Lost Communication With Door Control Module
U0199 Fiat — Lost Communication With Door Control Module
U0199 Ford — Lost Communication With Door Control Module 'A'
U0199 Honda — Immobilizer-Keyless Control Unit Lost Communication With Door Multiplex Control Unit
U0199 Jeep — Lost Communication With Door Control Module
U0199 Lincoln — Lost Communication With Door Control Module 'A'
U0199 Mercury — Lost Communication With Door Control Module 'A'
U0199 RAM — Lost Communication With Door Control Module

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U0199 Code

1. What are the common symptoms of OBDII code U0199?

When this code is present, you may experience issues such as power door locks not working, windows not functioning properly, interior lights not turning on, or other related problems.

2. What could cause the OBDII code U0199 to appear?

The code U0199 typically indicates a communication problem between the vehicle's main computer and the door control module 'A'. This can be caused by a faulty wiring connection, a defective door control module, or a malfunctioning main computer.

3. How can I diagnose the root cause of OBDII code U0199?

A thorough diagnostic process involving checking the wiring connections, testing the door control module, and inspecting the main computer is usually necessary to pinpoint the exact cause of the communication failure.

4. Can I still drive my vehicle with the U0199 code showing?

While it may be possible to drive the vehicle with this code, it is recommended to address the issue promptly to prevent further electrical system problems and ensure the proper functioning of your vehicle's door control features.

5. Are there any simple repair tips for resolving code U0199?

Sometimes, simply checking and securing the wiring connections related to the door control module 'A' can help resolve the communication issue. However, if the problem persists, professional diagnosis and repair may be required.

6. Is it safe to attempt repairing the U0199 code myself?

If you have experience working with automotive electrical systems and feel confident in your abilities, you may attempt simple checks like inspecting wiring connections. For complex issues or if you're unsure, it's best to consult a qualified mechanic.

7. Can extreme weather conditions contribute to the U0199 code appearing?

Yes, extreme temperatures or moisture exposure can potentially affect the electrical connections and components related to the door control module, leading to communication problems and triggering the U0199 fault code.

8. Will resetting the OBDII system clear the U0199 code?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the communication failure is not addressed, the code is likely to reappear once the problem is detected again.

9. How much can I expect to pay to repair the U0199 code?

The cost of repairing the U0199 code can vary depending on the exact cause of the communication failure. Simple fixes like securing wiring connections may be inexpensive, while replacing a faulty door control module or main computer can be more costly.

10. Can the U0199 code affect other vehicle systems besides the door controls?

While the primary impact of the U0199 code is on the door control module 'A', communication issues within the vehicle's electrical system can potentially affect other systems and components, leading to additional malfunctions.