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Engine-Codes – GMC – P0802 GMC

P0802 GMC Code - Transmission Control System MIL Request Circuit Open

Quick Answer

The P0802 diagnostic trouble code for GMC vehicles indicates a problem with the Transmission Control System MIL Request Circuit being open. Common causes include Faulty wiring or connectors in the Transmission Control System circuit, Malfunctioning Transmission Control Module (TCM), Faulty sensor within the transmission system. 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
P0802 GMC indicates Transmission Control System MIL Request Circuit Open.
Common causes
Common causes include Faulty wiring or connectors in the Transmission Control System circuit, Malfunctioning Transmission Control Module (TCM), Faulty sensor within the transmission system.
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 11, 2024
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Code P0802 GMC Description

The P0802 diagnostic trouble code for GMC vehicles indicates a problem with the Transmission Control System MIL Request Circuit being open. The MIL (Malfunction Indicator Lamp) is also commonly known as the Check Engine Light. This code means that the Transmission Control Module (TCM) has detected an issue with the circuit responsible for requesting the illumination of the Check Engine Light. The Transmission Control System is vital for the proper functioning of the vehicle's transmission, as it controls the shifting of gears and overall performance.

OBDII Code P0802 GMC - Transmission Control System MIL Request Circuit Open
P0802 GMC Code - Transmission Control System MIL Request Circuit Open

Common Causes of P0802 GMC

  1. Faulty wiring or connectors in the Transmission Control System circuit
  2. Malfunctioning Transmission Control Module (TCM)
  3. Faulty sensor within the transmission system
  4. Issues with the Powertrain Control Module (PCM)
  5. Corrosion or water damage in the electrical connections

Symptoms of P0802 GMC

  1. Check Engine Light is illuminated
  2. Harsh shifting between gears
  3. Delayed engagement when shifting
  4. Transmission not shifting at all
  5. Decreased fuel efficiency

How to Fix P0802 GMC

  1. Use a scan tool to retrieve the fault codes and diagnose the issue
  2. Inspect the wiring and connectors related to the Transmission Control System for any damage or corrosion
  3. Test the TCM and sensors to determine if they are functioning correctly
  4. Repair or replace any faulty components identified during diagnosis
  5. Clear the fault codes and reset the Check Engine Light

Cost to Fix P0802 GMC

The cost of repairing a P0802 code can vary depending on the exact cause of the issue and the labor rates of the auto repair shop. On average, the repair cost for this issue can range from $100 to $300 for parts and labor. However, it's important to note that the specific 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's advisable to check with local shops for a more accurate estimate.

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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 P0802 GMC Code

1. What are the common symptoms of OBDII code P0802 GMC?

The common symptoms of code P0802 GMC include the Check Engine Light (MIL) being illuminated on the dashboard and potential issues with the transmission control system.

2. What can cause the OBDII code P0802 GMC to appear?

The P0802 code typically appears due to a malfunction in the transmission control system MIL request circuit being open. This can be caused by wiring issues, a faulty transmission control module, or a poor electrical connection.

3. How serious is the OBDII code P0802 GMC?

While the P0802 code may not cause immediate drivability issues, it is important to address it promptly to prevent potential transmission problems in the future. Ignoring the code could lead to more severe issues over time.

4. How can I diagnose the OBDII code P0802 GMC?

Diagnosing the P0802 code involves using a professional OBDII scanner to retrieve the code and then inspecting the transmission control system components, wiring, and connectors for any visible issues. It may also require testing the circuit for proper voltage and continuity.

5. Can I still drive my vehicle with the OBDII code P0802 GMC present?

In most cases, it is safe to drive your vehicle with the P0802 code present, especially if you are not experiencing any noticeable transmission problems. However, it is recommended to have the issue diagnosed and repaired as soon as possible.

6. What are some repair tips for fixing the OBDII code P0802 GMC?

Repairing the P0802 code may involve checking and repairing any damaged wiring or connectors in the transmission control system circuit. It may also require replacing a faulty transmission control module if necessary.

7. How much does it typically cost to repair the OBDII code P0802 GMC?

The cost of repairing the P0802 code can vary depending on the extent of the issue and the specific components that need to be replaced. It is recommended to consult with a professional mechanic for an accurate diagnosis and cost estimate.

8. Can a DIY enthusiast fix the OBDII code P0802 GMC at home?

While some DIY enthusiasts may be able to diagnose and repair the P0802 code themselves, it is recommended to have a professional mechanic handle the repair to ensure it is done correctly and to prevent any further issues down the line.

9. Will resetting the OBDII code P0802 GMC make it go away permanently?

Resetting the P0802 code may temporarily turn off the Check Engine Light, but if the underlying issue is not addressed and repaired, the code is likely to reappear. It is important to diagnose and fix the root cause of the problem to prevent it from coming back.

10. How long does it take to repair the OBDII code P0802 GMC?

The repair time for the P0802 code can vary depending on the complexity of the issue and the availability of parts. In some cases, it may be a quick fix, while in others, it could take several hours or even days to fully diagnose and repair the problem.

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