U0140 Mercury Code - Lost Communication With Body Control Module
Quick Answer
The Powertrain Control Module (PCM) continuously monitors Controller Area Network (CAN) for messages from Body Control Module (BCM). Common causes include Communication error, Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted. 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
- U0140 Mercury indicates Lost Communication With Body Control Module.
- Common causes
- Common causes include Communication error, Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted.
- 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.
Code U0140 Mercury Description
What are the Possible Causes of the DTC U0140 Mercury?
- Communication error
- Faulty Body Control Module (BCM)
- Body Control Module (BCM) harness is open or shorted
- Body Control Module (BCM) circuit poor electrical connection
How to Fix the DTC U0140 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 U0140 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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Frequently Asked Questions about U0140 Mercury Code
1. What does the OBDII code U0140 mean on a Mercury?
The U0140 code means the vehicle has lost communication with the Body Control Module (BCM), which manages various electronic systems.
2. What are common symptoms of the U0140 code on a Mercury?
Symptoms include malfunctioning interior lights, power windows, door locks, or other electronic systems controlled by the BCM.
3. What causes the U0140 code to appear on a Mercury vehicle?
Common causes include a faulty BCM, damaged wiring or connectors, power supply issues, or network communication faults.
4. Can a dead battery trigger the U0140 code on a Mercury?
Yes, a dead or disconnected battery can cause a loss of communication with the BCM, triggering the U0140 code.
5. How can I diagnose the U0140 code on my Mercury?
Use an OBDII scanner to confirm the code, then inspect BCM wiring, connectors, and fuses for damage or corrosion.
6. Can I drive my Mercury with the U0140 code present?
Driving may be possible, but compromised BCM communication can lead to issues with safety features or other critical systems.
7. How do you fix the U0140 code on a Mercury?
Repairs may involve reconnecting loose wires, replacing damaged connectors, or replacing the BCM if it’s defective.
8. Does the U0140 code always mean the BCM is faulty?
No, the code can also occur due to wiring issues, power interruptions, or network communication faults unrelated to the BCM itself.
9. How much does it cost to repair the U0140 code on a Mercury?
Repair costs vary depending on the issue but can range from $100 for simple wiring fixes to $1,000 or more for BCM replacement.
10. Can clearing the U0140 code fix the problem on a Mercury?
Clearing the code may temporarily reset the system, but the underlying issue must be addressed to prevent the code from returning.
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