AutoCodes – Mercury – U0100 Mercury

U0100 Mercury Code - Lost Communication With Powertrain Control Module

Quick Answer

The Powertrain Control Module (PCM) communicates with the scan tool through the High Speed Controller Area Network (HS-CAN). Common causes include Faulty Powertrain Control Module (PCM), PCM harness is open or shorted, PCM 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: U0100 Mercury indicates Lost Communication With Powertrain Control Module.
Common causes: Common causes include Faulty Powertrain Control Module (PCM), PCM harness is open or shorted, PCM 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 2,757

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 Mar 29, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0100 Mercury Description

The Powertrain Control Module (PCM) communicates with the scan tool through the High Speed Controller Area Network (HS-CAN). The U0100 code sets in continuous memory if data messages received from the PCM over the High Speed Controller Area Network (HS-CAN) are missing for greater than 5 seconds.

OBDII Code U0100 Mercury - Lost Communication With Powertrain Control Module - AutoCodes.com — U0100 Mercury Code - Lost Communication With Powertrain Control Module

What does this mean?

What are the Possible Causes of the DTC U0100 Mercury?

Faulty Powertrain Control Module (PCM)
PCM harness is open or shorted
PCM circuit poor electrical connection

How to Fix the DTC U0100 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 U0100 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.

Need more information about the U0100 Mercury code?

Need more information on how to fix the U0100 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0100 Mercury code diagnosed by a professional: Find a repair shop in your area

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 U0100 Mercury Code

1. What does the OBDII code U0100 for Mercury mean?

The U0100 code indicates a communication problem between the vehicle's PCM (Powertrain Control Module) and other control modules.

2. What are the common symptoms of a U0100 code on a Mercury vehicle?

Common symptoms include engine stalling, rough idling, poor acceleration, and potential issues with the transmission shifting.

3. What are some possible causes of the U0100 code on a Mercury vehicle?

Causes may include damaged wiring or connectors, a faulty PCM, issues with the CAN bus communication system, or a drained battery.

4. How can I diagnose a U0100 code on my Mercury?

To diagnose the U0100 code, you may need a professional OBDII scanner to read the code and perform further diagnostic tests on the vehicle's communication network.

5. Can I still drive my Mercury with a U0100 code?

It is not recommended to drive your vehicle with a U0100 code as it can lead to potential safety hazards and further damage to the vehicle's systems.

6. How can I repair a U0100 code on my Mercury?

Repairing a U0100 code may involve checking and repairing any damaged wiring, replacing faulty connectors, resetting the PCM, or seeking assistance from a professional mechanic.

7. Are there any DIY tips for fixing a U0100 code on a Mercury?

DIY tips may include checking for loose or disconnected wires, ensuring proper battery connections, and conducting a visual inspection of the PCM and related components.

8. Is it necessary to reset the PCM after repairing a U0100 code on a Mercury?

Yes, it is recommended to reset the PCM after repairing a U0100 code to clear the error code and ensure proper communication between the control modules.

9. How much does it typically cost to repair a U0100 code on a Mercury at a mechanic?

Repair costs for a U0100 code can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Can a U0100 code on a Mercury be prevented?

Regular maintenance, checking the vehicle's wiring and connectors, and addressing any electrical issues promptly can help prevent the occurrence of a U0100 code on your Mercury.