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Engine-Codes – RAM – U0140 RAM

U0140 RAM Code - Lost Communication With Body Control Module

Quick Answer

The U0140 diagnostic trouble code indicates that the vehicle's engine control module (ECM) has lost communication with the body control module (BCM). Common causes include Faulty wiring or connectors, Malfunctioning BCM or ECM, Software glitches or coding errors. 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 RAM indicates Lost Communication With Body Control Module.
Common causes
Common causes include Faulty wiring or connectors, Malfunctioning BCM or ECM, Software glitches or coding errors.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code U0140 RAM Description

The U0140 diagnostic trouble code indicates that the vehicle's engine control module (ECM) has lost communication with the body control module (BCM). The body control module is responsible for managing various functions related to the vehicle's body, such as the lights, windows, mirrors, and door locks. When communication between the ECM and BCM is lost, it can lead to a range of issues that affect the vehicle's performance, safety, and overall functionality.

OBDII Code U0140 RAM - Lost Communication With Body Control Module
U0140 RAM Code - Lost Communication With Body Control Module

Common Causes of U0140 RAM

  1. Faulty wiring or connectors
  2. Malfunctioning BCM or ECM
  3. Software glitches or coding errors
  4. Water damage or corrosion in the electrical system
  5. Electrical interference from aftermarket accessories

Symptoms of U0140 RAM

  1. Loss of functionality in lights, windows, mirrors, or door locks
  2. Vehicle may not start or experience difficulty starting
  3. Engine may run rough or stall unexpectedly
  4. Dashboard warning lights may illuminate
  5. Vehicle may go into limp mode

How to Fix U0140 RAM

  1. Conduct a thorough diagnostic scan to retrieve the trouble codes and pinpoint the communication failure between the ECM and BCM.
  2. Inspect the wiring and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Check for any software updates or reprogramming that may be required to resolve the communication issue.
  4. Test the BCM and ECM for proper functionality and replace any faulty components.
  5. Clear the trouble codes, reset the system, and perform a final test drive to ensure the issue has been resolved.

Cost to Fix U0140 RAM

The cost of repairing a U0140 code can vary depending on the specific cause of the communication failure and the parts and labor required to address it. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. However, it is essential to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check with local auto repair shops to get a more precise estimate for this repair.

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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 U0140 RAM Code

1. What does OBD-II code U0140 on a RAM vehicle mean?

U0140 indicates the vehicle has lost communication with the Body Control Module (BCM), which manages various electrical systems.

2. What are the common symptoms of code U0140 in a RAM vehicle?

Symptoms may include malfunctioning interior lights, power windows, locks, or issues with the dashboard displays and gauges.

3. What causes the U0140 code in RAM vehicles?

Common causes include damaged wiring or connectors, a faulty BCM, or problems with the power supply to the BCM.

4. Can a dead battery trigger the U0140 code in RAM vehicles?

Yes, a dead or weak battery can disrupt communication with the BCM and trigger this code.

5. How do you diagnose the U0140 code in a RAM vehicle?

Start by checking the BCM’s wiring and connectors for damage or corrosion. Use a scan tool to verify communication with the BCM.

6. Can a faulty BCM cause the U0140 code?

Yes, if the BCM itself is defective, it may fail to communicate with other modules, triggering the U0140 code.

7. Is it safe to drive a RAM vehicle with the U0140 code?

While the vehicle may still be drivable, electrical malfunctions can affect safety systems, so it’s best to address the issue promptly.

8. How do you fix the U0140 code in a RAM vehicle?

Repair or replace damaged wiring, connectors, or the BCM itself. Clear the code and retest the system.

9. Does the U0140 code require BCM replacement?

Not always; it’s best to thoroughly inspect wiring and connectors first, as they are common culprits before considering BCM replacement.

10. How much does it cost to fix the U0140 code in a RAM vehicle?

Costs vary depending on whether the issue is simple wiring repair or BCM replacement, which can range from $200 to $1,000 or more.

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