U0140 GMC Code - Lost Communication With Body Control Module
Quick Answer
The U0140 code for GMC vehicles indicates that there is a communication issue between the Engine Control Module (ECM) and the Body Control Module (BCM). Common causes include Faulty Body Control Module, Damaged wiring harness, Loose or corroded connections. 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 GMC indicates Lost Communication With Body Control Module.
- Common causes
- Common causes include Faulty Body Control Module, Damaged wiring harness, Loose or corroded connections.
- 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 U0140 GMC Description
The U0140 code for GMC vehicles indicates that there is a communication issue between the Engine Control Module (ECM) and the Body Control Module (BCM). The Body Control Module is responsible for controlling various electrical systems in the vehicle, such as the lights, power windows, door locks, and other accessories. When communication is lost between the ECM and BCM, it can lead to malfunctions in these systems, affecting the overall performance and functionality of the vehicle.
Common Causes of U0140 GMC
- Faulty Body Control Module
- Damaged wiring harness
- Loose or corroded connections
- Software issue in ECM or BCM
Symptoms of U0140 GMC
- Erratic behavior of lights (flashing, flickering, or not working at all)
- Power windows not operating correctly
- Door locks malfunctioning
- Other electrical accessories not functioning as intended
How to Fix U0140 GMC
- Begin by performing a thorough inspection of the wiring harness and connections to check for any damage or corrosion. Repair or replace any damaged components.
- Use a diagnostic scan tool to communicate with the ECM and BCM to identify the specific communication issue. Reset any fault codes and recheck for the U0140 code.
- If the code persists, consider replacing the Body Control Module with a new or refurbished unit. Ensure that the replacement module is programmed and configured correctly for the vehicle.
- Clear any stored codes and perform a test drive to confirm that the communication between the ECM and BCM is restored, and the symptoms associated with the U0140 code have been resolved.
Cost to Fix U0140 GMC
The typical repair costs for addressing a U0140 code on a GMC vehicle can vary depending on the specific cause of the issue and the cost of parts and labor. In general, the cost of replacing a Body Control Module can range from $300 to $800, including parts and labor. However, additional diagnostic time and labor charges may apply, and the total cost could be higher based on the extent of the repair needed.
Tech Notes for U0140 GMC
2007-2010 GMC Sierra
2007-2010 GMC Yukon Models
2008-2010 GMC Sierra Hybrid
2008-2010 GMC Yukon Hybrid
GMC Factory Service Bulletin OBDII Code U0140
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Frequently Asked Questions about U0140 GMC Code
1. What are common symptoms of OBDII code U0140 (Lost Communication With Body Control Module) in a GMC vehicle?
- Common symptoms include issues with power windows, door locks, interior lights, and other body control functions.
2. What are possible causes of the U0140 trouble code in a GMC vehicle?
- Possible causes include a faulty body control module, wiring issues, loose connections, or a malfunctioning communication network.
3. How can I diagnose the U0140 code in my GMC vehicle?
- Diagnose the U0140 code by using a professional OBDII scanner to retrieve the specific details of the code and inspecting the body control module and related wiring for any visible issues.
4. Can I still drive my GMC vehicle with the U0140 code present?
- It is not recommended to drive the vehicle with the U0140 code present, as it may lead to further electrical malfunctions and safety concerns.
5. What are some repair tips for resolving the U0140 code in a GMC vehicle?
- Repair tips include checking and repairing any damaged wiring, ensuring all connections are secure, and, if needed, replacing the body control module.
6. Is it necessary to reset the U0140 code after making repairs in a GMC vehicle?
- Yes, it is important to clear the U0140 code after making repairs to ensure the issue has been resolved and to prevent any further confusion during future diagnostics.
7. How much does it typically cost to repair the U0140 code in a GMC vehicle?
- The cost of repairing the U0140 code can vary depending on the specific cause of the issue, but it may range from a couple of hundred to a few hundred dollars for parts and labor.
8. Can a DIY enthusiast fix the U0140 code issue in a GMC vehicle?
- While some DIY enthusiasts may have the skills to diagnose and repair the U0140 code, it is recommended to seek professional help due to the complexity of electronic systems in modern vehicles.
9. Are there any preventive measures to avoid the U0140 code in a GMC vehicle?
- Regularly inspecting and maintaining the electrical components in your GMC vehicle, such as checking for loose connections and addressing wiring issues promptly, can help prevent the U0140 code from occurring.
10. How long does it typically take to repair the U0140 code in a GMC vehicle?
- The repair time for the U0140 code can vary depending on the exact cause of the issue and the availability of parts, but it may take a few hours to a day for a professional technician to diagnose and repair the problem.
Discuss the causes and fixes for U0140 GMC OBDII Code
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2007 GMC YUKON i CANT START THE CAR ALL LIGHTS ON IN THE DASH BUT THE GAUGES NOT WORKING NO CRANKING AT ALL I PUT MY OBD MACHINE ON IT GIVE ME CODE U0140 LOST COMMUNICATION WITH BCM WHAT I HAVE TO START WITH
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Unfortunately there are many things that could cause the symptoms you have, but there is a factory service bulletin for you model year with the U0140 code. The factory recommends inspect the transmission connector. Make sure the connector and connectors pins are firmly secure
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