U1502 Code - Implausible Message Data Length Received From TCM
Quick Answer
The U1502 diagnostic trouble code (DTC) indicates that the Body Control Module (BCM) has received a message from the Transmission Control Module (TCM) with an implausible data length. Common causes include Faulty TCM: A malfunctioning Transmission Control Module can send incorrect data to the BCM, triggering this code, Wiring Issues: Damaged or corroded wiring connections between the TCM and BCM can disrupt communication and lead to this code, Software Glitch: A software bug or programming error in either the TCM or BCM can cause data length discrepancies. 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
- U1502 indicates Implausible Message Data Length Received From TCM.
- Common causes
- Common causes include Faulty TCM: A malfunctioning Transmission Control Module can send incorrect data to the BCM, triggering this code, Wiring Issues: Damaged or corroded wiring connections between the TCM and BCM can disrupt communication and lead to this code, Software Glitch: A software bug or programming error in either the TCM or BCM can cause data length discrepancies.
- 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 U1502 Description
The U1502 diagnostic trouble code (DTC) indicates that the Body Control Module (BCM) has received a message from the Transmission Control Module (TCM) with an implausible data length. This typically means that the data being communicated between these two modules is either incorrect or incomplete. This can lead to communication errors within the vehicle's network, causing issues with various systems and components. If left unresolved, it can potentially lead to further malfunctions in the vehicle's transmission system, affecting overall performance and drivability.
Common Causes of U1502
- Faulty TCM: A malfunctioning Transmission Control Module can send incorrect data to the BCM, triggering this code.
- Wiring Issues: Damaged or corroded wiring connections between the TCM and BCM can disrupt communication and lead to this code.
- Software Glitch: A software bug or programming error in either the TCM or BCM can cause data length discrepancies.
- Module Failure: A failure in either the TCM or BCM itself can result in faulty data transmission and trigger this code.
Symptoms of U1502
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
- Transmission Issues: The vehicle may experience shifting problems, such as harsh or delayed shifts, or even failure to shift gears.
- Loss of Power: The vehicle may exhibit a lack of power or acceleration due to communication errors affecting the transmission.
- Erratic Behavior: The vehicle may display erratic behavior, such as stalling, surging, or rough idling.
How to Fix U1502
- Diagnose: Use a diagnostic scanner to retrieve the specific code and investigate the communication between the TCM and BCM.
- Check Wiring: Inspect the wiring harness between the TCM and BCM for any damage, corrosion, or loose connections.
- Update Software: If a software glitch is suspected, reprogramming or updating the software in both modules may resolve the issue.
- Replace Module: If a faulty TCM or BCM is determined to be the cause, replacement of the affected module may be necessary.
- Clear Codes: Once the repair is completed, clear the codes and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix U1502
The cost of repairing a U1502 code can vary depending on the underlying cause and the specific components that need to be addressed. In general, the cost of parts for a TCM or BCM replacement can range from $200 to $800, excluding labor costs. Labor rates at auto repair shops typically range from $80 to $150 per hour. Therefore, the total repair cost for this issue could range from $300 to $1200 or more, depending on the extent of the repair needed. It's advisable to consult with a qualified mechanic or dealership to get an accurate estimate based on your vehicle's make and model.
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Code U1502 Information for Specific Makes
- U1502 Buick — Local Interconnect Network Bus Failure
- U1502 Cadillac — Local Interconnect Network Bus Failure
- U1502 Chevrolet — Local Interconnect Network Bus Failure
- U1502 Chrysler — Implausible Message Data Length Received From TCM
- U1502 Dodge — Implausible Message Data Length Received From TCM
- U1502 GMC — Local Interconnect Network Bus Failure
- U1502 Jeep — Implausible Message Data Length Received From TCM
- U1502 RAM — Implausible Message Data Length Received From TCM
Frequently Asked Questions about U1502 Code
1. What are common symptoms of OBDII code U1502?
- Common symptoms of OBDII code U1502 include transmission shifting issues, illuminated check engine light, and potential loss of communication with the transmission control module.
2. What causes the OBDII code U1502 to be triggered?
- The OBDII code U1502 is triggered when the Engine Control Module (ECM) receives an implausible message data length from the Transmission Control Module (TCM), indicating a communication error.
3. How can I diagnose the OBDII code U1502?
- Diagnosing the OBDII code U1502 involves checking the wiring and connections between the ECM and TCM, verifying the data sent and received, and performing a thorough inspection of the communication system.
4. What repair tips can help resolve the OBDII code U1502?
- Repair tips for resolving the OBDII code U1502 include checking and repairing any damaged wiring, ensuring proper connection between the ECM and TCM, and resetting the fault codes after making necessary repairs.
5. Can a faulty TCM cause the OBDII code U1502?
- Yes, a faulty Transmission Control Module (TCM) can potentially cause the OBDII code U1502 by sending incorrect message data length to the ECM, leading to a communication error.
6. Is it safe to continue driving with the OBDII code U1502 present?
- It is not recommended to continue driving with the OBDII code U1502 present, as it may result in transmission issues and other potential problems that can affect the vehicle's performance and safety.
7. How can I prevent the OBDII code U1502 from reoccurring?
- To prevent the OBDII code U1502 from reoccurring, it is essential to ensure proper maintenance of the vehicle's communication system, address any wiring issues promptly, and follow manufacturer-recommended service intervals.
8. Can a software update fix the OBDII code U1502 issue?
- In some cases, a software update provided by the vehicle manufacturer may help resolve the OBDII code U1502 issue by addressing communication errors between the ECM and TCM.
9. Will resetting the fault codes clear the OBDII code U1502?
- Resetting the fault codes may temporarily clear the OBDII code U1502, but it is crucial to address the underlying issue causing the communication error between the ECM and TCM to prevent the code from reoccurring.
10. How much does it typically cost to repair the OBDII code U1502?
- The cost of repairing the OBDII code U1502 can vary depending on the underlying cause, the extent of the repairs needed, and labor rates. It is recommended to consult with a professional mechanic for an accurate diagnosis and cost estimate.
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