P1589 fault code: what it means

P1589: Diesel intake shutter (throttle) valve opening larger than commanded. PCM restricts torque and stops EGR and DPF regeneration.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

intake shutter valve or position sensor
wiring shorted to ground
carbon build-up on the valve

P1589 by make

Mazda

Diesel intake shutter (throttle) valve opening larger than commanded. PCM restricts torque and stops EGR and DPF regeneration.

Usual causes: intake shutter valve or position sensor; wiring shorted to ground; carbon build-up on the valve

What the repair usually costs

Intake valve carbon clean (walnut blast, direct injection)NZ$530–NZ$1,190 · A$560–A$1,240

Not sure what P1589 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.