P2799 Fault Code

Auxiliary Transmission Fluid Pump Control Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2799 fault code refers to an issue with the auxiliary transmission fluid pump control circuit. When this code is triggered, it indicates that the control circuit is experiencing high voltage levels, affecting the operation of the transmission fluid pump. This pump is essential for maintaining proper fluid pressure and temperature, which are critical for the smooth functioning of the transmission system.

What are the symptoms of the P2799 code?

When the P2799 code is present, the vehicle may exhibit the following symptoms:

• Sluggish or delayed shifting between gears.
• Warning lights illuminated on the dashboard, such as the check engine light.
• Overheating of the transmission fluid, potentially leading to further damage.
• Unusual noises from the transmission area, indicating mechanical distress.

What causes the P2799 code?

Several factors can trigger the P2799 code, including:

• A malfunctioning auxiliary transmission fluid pump.
• Short circuits or open circuits in the control wiring.
• Faulty electrical connectors or grounds.
• Issues within the transmission control module (TCM) that regulates the pump's operation.

How to fix P2799?

To resolve the P2799 fault code, the following steps should be taken:

1. Inspect the auxiliary transmission fluid pump for damage or failure.
2. Check all wiring and connectors for signs of shorts or disconnections.
3. Test the voltage and resistance in the control circuit to ensure they are within specifications.
4. If necessary, replace the faulty components, including the pump or the TCM, and reset the fault codes.
5. After repairs, monitor the transmission performance to ensure the issue is resolved.