P0488 Exhaust Gas Recirculation Throttle Position Control Range/Performance

P0488 indicates a range or performance issue in the EGR throttle position control system. The throttle response does not match the commanded EGR support position.

Code details

Generic OBD-II · P0

System: Emissions
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace sensors until the EGR throttle mechanism and airflow response have been checked.

Symptoms of P0488

Check-engine light, often with no obvious change in how the car drives.
A failed emissions test or incomplete readiness monitors.
Sometimes a faint fuel-vapour smell (on EVAP codes).

Common causes of P0488

A worn catalytic converter or an oxygen/air-fuel sensor reading out of range.
EVAP leaks — a loose or failed gas cap, cracked hose, or purge/vent valve.
Exhaust leaks, fuel-trim problems, or a fault in a related monitor.

Useful checks before replacing parts

Compare commanded and actual EGR throttle position, MAP or MAF response, EGR duty cycle, idle quality, and freeze-frame operating conditions.
Inspect carbon buildup, sticking throttle plates, actuator strength, feedback sensor accuracy, wiring resistance, connector damage, and intake restriction.
Check whether the throttle is slow, limited, over-traveling, or inconsistent during commanded movement.

Related OBD-II codes

These nearby emissions entries can help compare wording and pin down the fault area.