P0488 fault code: what it means

P0488: EGR throttle (diesel intake throttle) position control range/performance.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

carbon-jammed diesel throttle
failed throttle motor
wiring fault

P0488 by make

Isuzu

EGR throttle (diesel intake throttle valve) control range/performance. Often carbon build-up on the valve.

Usual causes: carboned intake throttle; failed actuator

Mazda

Diesel EGR valve control duty signal error: the EGR valve is not following its command. Often carbon build-up.

Usual causes: EGR valve sticking with carbon; EGR valve motor fault; wiring fault

Toyota

EGR / diesel throttle position control range/performance: the diesel throttle valve is not reaching its target position.

Usual causes: carbon-jammed diesel throttle valve; failed throttle motor; wiring fault

What the repair usually costs

EGR valve replacement or cleanNZ$350–NZ$1,710 · A$330–A$1,630
EV drive unit / motor replace (exchange or used)NZ$5,580–NZ$15,340 · A$6,120–A$16,200

Not sure what P0488 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.