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P2789 is a diagnostic trouble code (DTC) for "Clutch 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 for $69.99. 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.
When the P2789 code applies to vehicles with dual clutch automated manual transmissions. When it is saved, it indicates that the powertrain control module (PCM) has detected an abnormality in the clutch’s adaptive learning system and that some error has occurred in the clutch system’s adaptive learning capabilities.
To adapt to the vehicle owner’s style of driving, the dual clutch system, controlled by the vehicle’s computer, learns and adapts, thanks to input from a number of actuators and sensors. When the clutch adaptive learning system is unable to continue to learn and adapt, the P2789 code is saved, alerting the driver through an illuminated Check Engine Light or MIL (Malfunction Indicator Light), that the clutch adaptive learning system is not performing normally.
The P2789 code is caused when the desired normal amount of adaptive response exceeds its predetermined limit. Depending upon the make and model of the vehicle, the P2789 code may not be stored until several failure cycles have occurred, but after this the code will be stored and the MIL or Check Engine Light will illuminate.
There may be no noticeable symptoms besides the illuminated MIL. This symptom, however, may also come alongside others, including:
Other codes may also accompany the P2789 code, including DTC codes for:
To diagnose a P2789 code, a mechanic will use a code reader (or scanner) and a digital volt/ohmmeter. Upon scanning for Diagnostic Trouble Codes, other codes related to the clutch and transmission system should be diagnosed and fixed first, as one or more of these may be the cause of the P2789 code.
Mechanical clutch failure is a common cause of the P2789 code. So, after checking for other codes, the mechanic will diagnose and repair any defective solenoids, sensors, and/or actuators. The mechanic will also take steps to check for insufficient fluid pressure, as well as transmission diagnostics.
The most common mistakes when diagnosing the P2789 code generally involve overlooking malfunctions in the shift solenoid, pressure control solenoid, and/or wiring. When these are missed, a clutch or transmission replacement or rebuild is often done when it is not called for, costing the vehicle owner more while failing to solve the problem.
While some instances of the P2789 code come with no symptoms at all, this is a serious problem that can get worse if left undiagnosed. Hard shifts, a clutch that will not disengage or engage, and/or an engine that stalls at idle can put the driver in significant danger, depending on where and when these malfunctions happen.
Some common repairs for the P2789 code include:
A test must be done after each repair to determine whether or not the mechanic has found the cause of the P2789 code.
Failure to continue to learn and adapt to your driving style may not seem like a major problem, but considering how many other issues can be triggered by the P2789 code and codes associated with it, it is definitely not one to leave alone. An undiagnosed P2789 code problem could put you in serious danger and could cause other problems for your transmission and clutch. If you’ve experienced one or more of the symptoms of this code and your MIL or Check Engine light has illuminated, you should get it diagnosed and repaired immediately.
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 1-800-701-6230.