P0488: Exhaust Gas Recirculation Throttle Control Circuit A Range/Performance
What to do
Usually driveable. Cleaning rather than replacement often fixes this properly. If the vehicle does mostly short, cold journeys, expect it to recur — that driving pattern is what produces the deposits.
What this code means
The EGR throttle valve is moving, but not to the commanded position or not quickly enough. Carbon build-up on the butterfly and its bore is the dominant cause — the valve closes onto its own deposits and cannot reach the position the module expects.
Cleaning is frequently a genuine repair here rather than a temporary measure, provided the deposits are removed properly and whatever produced them is addressed. Heavy carbon in the intake usually indicates high EGR flow over many short journeys, so the driving pattern is part of the diagnosis.
Likely causes
Start here
- Carbon-coated EGR throttle valve · moderate
- Failed EGR throttle actuator · moderate
Less common
- Faulty throttle position sensor · easy
- Carbon-blocked EGR passage · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about P0488.