P2788 Fault Code

Auto Shift Manual Adaptive Learning at Limit

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

The P2788 fault code indicates that the transmission control module (TCM) has detected a situation where the Adaptive Learning feature for the auto shift manual transmission has reached its limit. This system helps optimize the shifting of gears based on the driving style and conditions. When learning is at its limit, the transmission may not be able to adapt effectively to changes in driving preferences or conditions.

What are the symptoms of the P2788 code?

Common symptoms associated with the P2788 code may include:

• Difficulty shifting gears or erratic shifting behavior
• Slipping transmission or loss of power during acceleration
• Unusual noises coming from the transmission when shifting
• Check Engine Light (CEL) illuminated on the dashboard.
• Poor fuel economy due to inefficient shifting.

What causes the P2788 code?

The potential causes of this code can include:

• Faulty transmission control module (TCM)
• Issues with the wiring or connectors related to the TCM
• Malfunctioning sensors that provide input to the TCM
• Internal transmission problems affecting shift quality
• Calibration issues resulting from recent repairs or transmission replacement.

How to fix P2788?

To resolve the P2788 fault code, consider the following steps:

• Inspect and repair any damaged wiring or connectors associated with the TCM.
• Check the transmission fluid level and condition; replace if dirty or low.
• Perform a thorough diagnostic scan to check for other related codes.
• Reset the TCM and perform a relearning procedure as per the manufacturer's guidelines.
• If necessary, replace the TCM or consult with a professional for further diagnosis.