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P004C fault code: what it means

P004C: Diesel turbo wastegate solenoid valve circuit low. Boost may be uncontrolled or low; i-stop is disabled.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. wastegate solenoid valve or connector
  2. open or shorted supply wiring
  3. PCM

P004C by make

Mazda

Diesel turbo wastegate solenoid valve circuit low. Boost may be uncontrolled or low; i-stop is disabled.

Usual causes: wastegate solenoid valve or connector; open or shorted supply wiring; PCM

Not sure what P004C means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.