Error code

OBD2 P0874

OBD2P0874
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Transmission Fluid Pressure Sensor/Switch 'C' Circuit Intermittent.

Severity

severeDo not drive as severe transmission damage could result.

Summary

P0874 indicates an intermittent issue with the transmission fluid pressure sensor or switch 'C' circuit in the automatic transmission system.

Symptoms

  • Check engine light
  • Transmission not engaging
  • Incorrect shifting
  • Burnt fluid smell

Common Causes

  • Low transmission fluid level
  • Dirty or contaminated transmission fluid
  • Faulty wiring or connection to the TFP sensor
  • Damaged TFP sensor
  • Internal transmission pressure pump malfunction

Diagnosis

  1. Check and top up the transmission fluid level.
  2. Inspect for leaks in the transmission system.
  3. Examine wiring connections to the TFP sensor for damage or corrosion.
  4. Test the voltage, ground, and resistance of the TFP sensor.
  5. Consult a professional if internal pump issues are suspected.

Fixes

  • Replace faulty wiring or repair leaks in the transmission system.
  • Replace the damaged TFP sensor.

FAQ

What should I do if my car enters 'limp home' mode with P0874?

Do not drive and seek professional help immediately to avoid severe transmission damage.

Can a faulty PCM cause this code?

A faulty PCM is extremely rare but possible. It should only be considered after ruling out other causes.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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