P0488
PowertrainEgr Systemmoderate severityEGR Throttle Position Control Range/Performance
What P0488 Means
The PCM has detected that the EGR throttle position is out of the expected range. This performance fault affects EGR flow and emissions.
Symptoms
- Check engine light on
- Rough idle
- Increased emissions
Common Causes
- Carbon-clogged EGR throttle
- Faulty EGR actuator
- Damaged wiring or connector
- Faulty PCM
Diagnostic Steps
- Scan for stored codes
- Monitor EGR throttle position data
- Inspect for carbon buildup
- Test actuator response
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