AutoCodes – Mercury – U0201 Mercury

U0201 Mercury Code - Lost Communication With Driver Rear Door Module

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 Driver Rear Door Module (DRDM), Driver Rear Door Module harness is open or shorted, Driver Rear Door Module 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: U0201 Mercury indicates Lost Communication With Driver Rear Door Module.
Common causes: Common causes include Faulty Driver Rear Door Module (DRDM), Driver Rear Door Module harness is open or shorted, Driver Rear Door Module 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.

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Code Popularity 472

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 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0201 Mercury 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 Driver Rear Door Module (DRDM) has not been received.

OBDII Code U0201 Mercury - Lost Communication With Driver Rear Door Module - AutoCodes.com — U0201 Mercury Code - Lost Communication With Driver Rear Door Module

What does this mean?

What are the Possible Causes of the DTC U0201 Mercury?

Faulty Driver Rear Door Module (DRDM)
Driver Rear Door Module harness is open or shorted
Driver Rear Door Module circuit poor electrical connection

How to Fix the DTC U0201 Mercury?

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 U0201 Mercury 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.

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Need more information on how to fix the U0201 Mercury code? Get Access to Factory Service Manuals

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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 U0201 Mercury Code

1. What are the common symptoms of OBDII code U0201 in a Mercury related to lost communication with the driver rear door module?

Symptoms may include non-functional power windows or door locks on the driver rear door, interior lights not working, and issues with the door ajar warning system.

2. What are some possible causes of the U0201 code in a Mercury?

Common causes include a faulty driver rear door module, damaged wiring or connectors leading to the module, or issues with the vehicle's communication network.

3. How can I diagnose the U0201 code in my Mercury?

Diagnosis involves checking the wiring and connectors leading to the driver rear door module for any damage, testing the module itself for functionality, and using a scan tool to communicate with the module and identify the communication issue.

4. Is it safe to continue driving my Mercury with the U0201 code present?

It is generally not recommended to drive the vehicle with the U0201 code as it can affect crucial functions related to the driver rear door, compromising safety and convenience.

5. Can I repair the U0201 code in my Mercury by resetting the vehicle's computer?

Simply resetting the vehicle's computer may not resolve the U0201 code. Proper diagnosis and repair of the underlying communication issue with the driver rear door module are necessary.

6. Are there any common DIY repair tips for fixing the U0201 code in a Mercury?

DIY repair tips may include checking and repairing any damaged wiring or connectors leading to the driver rear door module, ensuring proper grounding connections, and following a detailed repair manual.

7. What should I do if I suspect the driver rear door module is faulty in my Mercury?

If you suspect the driver rear door module is faulty, it is recommended to have it professionally inspected and tested to determine if it needs to be repaired or replaced.

8. Can extreme weather conditions contribute to the U0201 code in a Mercury?

Extreme weather conditions such as excessive heat or moisture can potentially damage the wiring or connectors leading to the driver rear door module, leading to communication issues and triggering the U0201 code.

9. How much can I expect to pay to repair the U0201 code in a Mercury at a dealership or mechanic?

Costs for repairing the U0201 code can vary depending on the exact cause of the issue, but you can generally expect to pay for diagnostic time, parts, and labor, which may range from a few hundred to over a thousand dollars.

10. Is the U0201 code specific to Mercury vehicles, or can it occur in other car makes and models?

The U0201 code related to lost communication with the driver rear door module is not specific to Mercury vehicles and can occur in other car makes and models equipped with OBDII systems.