P0891

2017-10-10

Description:

  • The fault code P0891 indicates that there is an issue with the transmission control module (TCM) power relay sense circuit, which is registering a low voltage signal. This may result in transmission issues or failure to start.

Possible Symptoms:

  • Transmission issues, such as shifting problems or failure to shift gears

  • Illuminated check engine light

  • Failure to start

  • Reduced engine power or acceleration.

Possible Causes:

  • Faulty power relay sense circuit

  • Damaged wiring or connections in the circuit

  • Loose or corroded electrical connections

  • Failed TCM

Related Parts:

  • Traction Control Module (TCM): Most modern vehicles are equipped with anti-lock brakes and traction control. Traction Control Module (TCM) is the part of the car computer that controls the electronic stability system (ESC) of the car. Problem leads to inefficient braking, ABS not working

Possible Solutions:

  • Replace the faulty power relay sense circuit

  • Check and repair any damaged wiring or connections

  • Tighten or clean any loose or corroded electrical connections

  • Replace the TCM if necessary

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