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P2788 is a diagnostic trouble code (DTC) for "Auto Shift Manual Adaptive Learning at Limit". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
This DTC represents Auto Shift Manual Adaptive Learning at Limit.
Your vehicle adapts to your specific driving habits via adaptive transmission. This function is controlled by the PCM (powertrain control module) or TCM (transmission control module), using a variety of data obtained from sensors, actuators, and hydraulic pressure information. The purpose of the system is to improve torque application and devise an efficient shifting strategy according to the driving conditions.
When the computer detects an anomaly in the adaptive learning system of the transmission, P2788 will set. The degree by which the adaptive response must exceed the expected limitations varies by make and model. In general, code-setting parameters are based upon throttle position, engine speed, engine load, and vehicle speed calculations.
A problem with the automatic shifting manual adaptive learning system may be caused by:
There may be a range of signs from no noticeable symptoms at all, all the way to completely disabled shifting function. Other possible problems include stalling at idle, harsh shifting, transmission overheating or slipping, and decreased fuel economy. The MIL (malfunction indicator lamp) may illuminate, and the code will store. There may also be other torque converter clutch, shift solenoid, gear ratio, or transmission slippage codes present.
Diagnosis may involve:
Sometimes the transmission is rebuilt/replaced without checking all associated solenoids, wiring, and connections. This is a very expensive error to make, so be sure your technician is carrying out a thorough diagnostic process.
You should generally regard any transmission code as serious. Even if the problem is simply faulty wiring or a solenoid, this may lead to the transmission not functioning properly, which can eventually cause severe damage within the mechanical components.
Possible fixes for this DTC include:
One of the first steps in determining the severity of this issue is to check the transmission fluid. If it looks or smells burned or abnormal in any way, this is a sign that the transmission has run in a low fluid condition for at least some amount of time, and there is a chance it may already have experienced catastrophic internal damage.
Dealing with transmission diagnoses and repairs can be a major undertaking, particularly if there is damage to the transmission itself. When dealing with a code like P2788 it’s best to leave the dirty work to a professional. A qualified technician has the required tools and expertise to find the source of the problem and fix it.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.