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Gearbox Light On

Gearbox Light On Brand: Peugeot and Citroen Models: All models fitted with AL4 automatic gearbox

Symptom

Customer complaint is that an instrument warning light is illuminated indicating problems with the transmission.

Cause

One potential cause of this is low internal oil pressure in the transmission. The fault code for this is P006 and the description of the fault code is “oil pressure regulation.”

Repair

  • Using your AssistPlus, go to GEARBOX MENU >> SELECT PARAMETERS >> SELECT MAIN VARIABLES.
  • Read the oil pressure value. 
  • The following readings are correct:
    • Engine at idle
      • Gear lever in D position, pressure = 3 to 21 bars
      • Gear lever in P position, pressure = 2.5 to 3 bars
    • Vehicle moving
      • During driving start off = 12 to 21 bars
      • During driving and changing gears =  3 to 12 bars​
If oil pressure readings are incorrect, the fault may be oil pressure EVM solenoid failure.
Strip hydraulic block and replace solenoid.
If necessary, obtain repair manual from PSA online service box website.
If oil pressure readings are correct, remove a sample of oil from the gearbox and check for metal swarf (chips or filings). If there is swarf present, consider internal component failure. 
Full gearbox strip required.
Obtain repair manual from Puegeot/Citroen online service box websites.
If no swarf is present, retest oil pressure.