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P0771 is a diagnostic trouble code (DTC) for "Shift Solenoid E Performance or Stuck Off". 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 $79.99. 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.
The P0771 code signifies that the car’s computer has detected a problem with shift solenoid E.
A P0771 code means that there is a problem with the shift solenoid E in the automatic transmission. Your car’s transmission uses solenoids to automatically adjust the flow of transmission fluid to match driving needs and ensure smooth shifting. The problem can be due to electrical issues with the solenoid, or it could be contamination of the solenoid itself causing it to stick.
Code P0771 can be caused by many different factors, including the following:
You may experience a number of different symptoms with code P0771, including the following:
First, a mechanic will use an OBD II scanner to pull any codes from the car’s computer. Often, there are additional codes stored as well as the P0771 code. These can provide further guidance for the mechanic to determine the underlying problem.
The mechanic will also check the level and color of the transmission fluid to determine if the fluid is low, dirty or contaminated. This can also provide valuable guidance for further diagnostics, as well as determining the underlying cause of the trouble code.
If the fluid smells burnt or is very dark, the mechanic may pull the transmission fluid pan and inspect the fluid as well as the transmission for signs of damage from debris, such as clutch material. If no debris is found, the mechanic will then inspect the wiring harness and connection to shift solenoid E and replace any damaged wires, or clean corrosion and tighten connections.
The mechanic will also top off the transmission fluid (or change it completely in the case that it is dirty), and then clear the codes. The vehicle will be test driven for operation as well as to see if the code resets. Freeze frame data stored in the computer will also be used.
The shift solenoid E may also need to be tested mechanically and electrically. If it fails these tests, it will need to be replaced. The entire shift solenoid circuit should also be tested.
The most common mistake is replacing shift solenoid E without first testing the shift solenoid circuit. Often, a malfunction with the circuit due to wiring damage or loose connections is the actual cause, rather than failure of the solenoid. Debris clogging the solenoid is also a common culprit.
The P0771 code is serious, as it will affect whether the vehicle can be safely driven. If the transmission fluid is contaminated, further driving can cause damage to other system components, as well. Repair this problem as soon as possible.
In most instances, repairs to the shift solenoid wiring harness will fix the P0771 code, although replacing a faulty or clogged solenoid is also common. Adhering to the specified transmission service schedule can help to mitigate the risk of debris clogging the solenoid.
While it can be tempting to assume that the problem is the solenoid, mechanics should not forget that the circuit can play a significant role here, and should be tested before parts are replaced.
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.