OBD code P0488

The throttle valve associated with EGR or intake control is not reaching the position expected by the ECU.

Estimated severity

Medium

Common symptoms

Check engine light on
Power loss or limp mode
Rough shutdown or engine shudder when switching off
Smoke or hesitation at low load
Associated EGR or air-flow codes

Likely causes

Dirty or sticking EGR/intake throttle flap
Faulty throttle actuator
Position sensor out of range
Wiring or connector issue
Intake soot and oil buildup restricting movement

Recommended checks

1. Check commanded and actual throttle position with a scanner.
2. Inspect the throttle body or EGR throttle for carbon and oil deposits.
3. Check actuator connector, wiring and power supply.
4. Clean and adapt the throttle if the manufacturer procedure allows it.
5. Check EGR codes and intake leaks before replacing the assembly.

What does code P0488 mean?

P0488 is related to the throttle flap used on many diesel engines to manage EGR flow, intake air and smooth shutdown. If it sticks or reports the wrong position, EGR control becomes inaccurate and the engine may lose power, run roughly or set additional emissions codes.

Try assisted diagnostics