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U1502 RAM 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 an implausible message data length from the Transmission Control Module (TCM). Common causes include Faulty wiring or connectors between the BCM and TCM, Corrosion or damage to the communication lines, Software issues in either the BCM or TCM. 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 RAM indicates Implausible Message Data Length Received From TCM.
Common causes
Common causes include Faulty wiring or connectors between the BCM and TCM, Corrosion or damage to the communication lines, Software issues in either the BCM or TCM.
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 17, 2024
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Code U1502 RAM Description

The U1502 diagnostic trouble code (DTC) indicates that the Body Control Module (BCM) has received an implausible message data length from the Transmission Control Module (TCM). This means that the length of the data received by the BCM from the TCM does not match the expected length, leading to a communication error between these two modules. This communication error can disrupt the proper functioning of various vehicle systems that rely on data exchange between the BCM and TCM.

OBDII Code U1502 RAM - Implausible Message Data Length Received From TCM
U1502 RAM Code - Implausible Message Data Length Received From TCM

Common Causes of U1502 RAM

  1. Faulty wiring or connectors between the BCM and TCM
  2. Corrosion or damage to the communication lines
  3. Software issues in either the BCM or TCM
  4. Faulty BCM or TCM
  5. Electrical interference from other components

Symptoms of U1502 RAM

  1. Erratic shifting patterns
  2. Transmission slippage
  3. Poor fuel efficiency
  4. Check Engine Light illuminated
  5. Reduced performance

How to Fix U1502 RAM

  1. Begin by conducting a thorough inspection of the wiring and connectors between the BCM and TCM to check for any damage or corrosion. Repair or replace any faulty wiring or connectors.
  2. Check for any software updates or reprogramming that may be available for the BCM and TCM. Update the software as needed to ensure compatibility and proper communication.
  3. Test the BCM and TCM for any internal faults using diagnostic tools. Replace any faulty modules if necessary.
  4. Clear the DTC and perform a test drive to ensure that the communication error has been resolved and that the vehicle is operating normally.
  5. If the issue persists, consult a professional technician for further diagnosis and repair.

Cost to Fix U1502 RAM

The typical repair costs for addressing the U1502 code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair can range from $100 to $500, while labor costs can range from $100 to $300. Overall, the total repair cost for resolving the U1502 code may fall between $200 and $800. However, it's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and labor rates at the auto repair shop. It's recommended to obtain quotes from multiple shops to ensure a competitive price for the 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 U1502 RAM Code

1. What are the common symptoms of OBDII code U1502 RAM?

- Common symptoms include erratic shifting of the transmission, poor fuel efficiency, and the illumination of the Check Engine Light.

2. What does the OBDII code U1502 RAM mean?

- The code U1502 RAM indicates an implausible message data length received from the Transmission Control Module (TCM).

3. What are the possible causes of OBDII code U1502 RAM?

- Common causes include faulty TCM, wiring issues, software glitches, or communication errors within the vehicle's network.

4. How can I diagnose OBDII code U1502 RAM?

- Diagnosis typically involves using a diagnostic scanner to retrieve the code, checking for other related codes, and inspecting the TCM and associated wiring for any issues.

5. Can I continue driving with OBDII code U1502 RAM?

- It is not recommended to continue driving with this code as it can lead to further damage to the transmission system. It is best to address the issue promptly.

6. How can I repair OBDII code U1502 RAM?

- Repair methods may include resetting the code, checking and repairing any wiring issues, updating the TCM software, or replacing the TCM if necessary.

7. Is OBDII code U1502 RAM a serious issue?

- While it may not cause immediate breakdown, ignoring this code can lead to transmission problems and potentially costly repairs if not addressed in a timely manner.

8. Can a DIY enthusiast fix OBDII code U1502 RAM?

- Depending on the underlying cause, some DIY enthusiasts may be able to address this code by checking wiring connections, performing software updates, or replacing components like the TCM.

9. How long does it take to repair OBDII code U1502 RAM?

- The repair time can vary depending on the exact cause of the issue, but it may take anywhere from a few hours to a day for diagnosis and repair.

10. Will clearing the OBDII code U1502 RAM make it go away permanently?

- Clearing the code may temporarily turn off the Check Engine Light, but if the underlying issue is not addressed, the code is likely to return. It is essential to diagnose and repair the root cause.

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