P0877 — Transmission Fluid Pressure Sensor/Switch D Circuit Low

P0877: Transmission Fluid Pressure Sensor/Switch D Circuit Low — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Transmission Fluid Pressure Sensor/Switch D Circuit Low. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • The transmission has detected a low electrical signal from fluid-pressure sensor D.
  • A warning, delayed gear changes or a protective transmission mode may occur.

Possible causes

  • A shorted signal wire, loose connector or faulty sensor can lower the electrical signal.
  • This does not independently prove that the actual oil pressure is low.

What to check

  • Read related codes and the live pressure-sensor signal.
  • Inspect wiring and test reference voltage, ground and signal with the model-specific circuit diagram.

Also written as: P0877-00, P087700, PO877 (some scan tools add the fault-type byte, e.g. -00).