P0771 Code - Shift Solenoid 'E' Performance or Stuck Off

What does P0771 Mean?

OBD-II Code Transmission may not shift properly is defined as a Shift Solenoid "E" Performance/Stuck Off

The Transmission Control Module (TCM) uses Shift Solenoids to control the hydraulic pressure in the transmission which is needed to apply the various clutch packs in the transmission that provide the different gear ratios needed to efficiently propel the vehicle down the road. When the TCM detects a pressure control solenoid is not performing as desired, it will set code P0771.

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What are the common causes of P0771 ?

• Some aftermarket accessories and performance modifications
• A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
• Faulty IMRC actuator/sensor

How do you troubleshoot P0771 ?

There are currently two main types of cylinder deactivation used today, depending on the type of engine. P0771 code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.

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