AutoCodes – Mercury – U0202 Mercury

U0202 Mercury Code - Lost Communication With Passenger 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 Passenger Rear Door Module (PRDM), Passenger Rear Door Module harness is open or shorted, Passenger 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: U0202 Mercury indicates Lost Communication With Passenger Rear Door Module.
Common causes: Common causes include Faulty Passenger Rear Door Module (PRDM), Passenger Rear Door Module harness is open or shorted, Passenger 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 541

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 U0202 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 Passenger Rear Door Module (PRDM) has not been received.

OBDII Code U0202 Mercury - Lost Communication With Passenger Rear Door Module - AutoCodes.com — U0202 Mercury Code - Lost Communication With Passenger Rear Door Module

What does this mean?

What are the Possible Causes of the DTC U0202 Mercury?

Faulty Passenger Rear Door Module (PRDM)
Passenger Rear Door Module harness is open or shorted
Passenger Rear Door Module circuit poor electrical connection

How to Fix the DTC U0202 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 U0202 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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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 U0202 Mercury Code

1. What are the common symptoms of OBDII code U0202 in a Mercury related to lost communication with the passenger rear door module?

- Common symptoms include malfunctioning power windows, door locks not working, and issues with interior lights in the affected door.

2. What are the typical causes of OBDII code U0202 in a Mercury?

- The code U0202 is usually triggered by a faulty passenger rear door module, damaged wiring, loose connections, or a problem with the vehicle's network communication system.

3. How can I diagnose the root cause of OBDII code U0202 in my Mercury?

- To diagnose the issue, you can start by checking the wiring and connections leading to the passenger rear door module, inspecting the module for any physical damage, and using a diagnostic tool to scan for specific error codes.

4. Is it safe to continue driving my Mercury with the U0202 code indicating lost communication with the passenger rear door module?

- While the vehicle may still operate, it is recommended to address the issue promptly to avoid potential safety hazards and further damage to the vehicle's electrical system.

5. Can I repair OBDII code U0202 in my Mercury by resetting the system or clearing the fault code?

- Simply clearing the fault code may temporarily eliminate the warning light, but it will not fix the underlying issue causing the lost communication with the passenger rear door module.

6. Are there any DIY tips for fixing OBDII code U0202 in a Mercury?

- DIY tips may include checking and securing the wiring connections, inspecting the module for damage, and ensuring proper power supply to the affected door module.

7. What's the typical cost to repair OBDII code U0202 in a Mercury at a professional automotive service center?

- The cost of repairing code U0202 can vary depending on the extent of the issue, but it may involve diagnostic fees, parts replacement, and labor costs, which can range from $100 to $500 or more.

8. Can a regular mechanic address the OBDII code U0202 issue in my Mercury, or do I need to visit a dealership?

- A skilled mechanic with experience in diagnosing and repairing electrical system issues should be able to address the U0202 code, so visiting a dealership is not always necessary.

9. Will fixing OBDII code U0202 improve the overall performance and safety of my Mercury?

- Yes, resolving the communication issue with the passenger rear door module can restore proper functionality to affected systems, ensuring optimal performance and safety of the vehicle.

10. How can I prevent OBDII code U0202 from recurring in my Mercury in the future?

- To prevent the U0202 code from coming back, ensure regular maintenance checks, address any electrical issues promptly, and keep an eye on the condition of the vehicle's wiring and modules.