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P0034 fault code: what it means

P0034: Haval turbo petrol: turbo bypass valve control circuit low.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. bypass valve
  2. wiring short

P0034 by make

Haval

Haval turbo petrol: turbo bypass valve control circuit low.

Usual causes: bypass valve; wiring short

Mazda

Diesel turbo compressor bypass solenoid circuit low (SKYACTIV-D two-stage turbo). Boost control is affected; i-stop is disabled and power may drop.

Usual causes: compressor bypass solenoid valve or connector; open or shorted power supply wiring (ENGINE2 fuse); PCM

MG

On MG turbo petrols: turbo bypass valve control circuit low.

Usual causes: bypass valve; wiring short

Not sure what P0034 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.