P0899

2017-10-10

Description:

  • The fault code P0899 indicates a high voltage condition in the transmission control system's MIL (Malfunction Indicator Lamp) request circuit. This code is often associated with a malfunction or fault within the transmission control module (TCM), causing the MIL to be continuously illuminated or stay on when it should be off.

Possible Symptoms:

  • Malfunction Indicator Lamp (MIL) continuously illuminated or staying on when it should be off.

  • Inability to turn off the MIL even after clearing fault codes.

  • Limited or no communication with the TCM through diagnostic tools.

  • Other associated transmission

  • related fault codes may be present.

  • No noticeable drivability issues are typically associated with this fault code.

Possible Causes:

  • Faulty transmission control module (TCM)

  • Wiring or electrical connection issues in the MIL request circuit

  • Short to voltage in the MIL request circuit

  • Malfunctioning MIL bulb or LED

  • Faulty instrument cluster or related components

Related Parts:

  • Transmission Control System: Gear system in the car

Possible Solutions:

  • Inspect the wiring and electrical connections in the MIL request circuit for any damage, loose connections, or short to voltage. Repair or replace as necessary.

  • Test and replace the faulty transmission control module (TCM), if necessary.

  • Verify the functionality of the MIL bulb or LED. Replace if it is defective.

  • Check for any faults or issues with the instrument cluster or related components. Repair or replace as needed.

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