What this code means

The PCM has detected a malfunction in the EGR system monitor function. The EGR system is not operating within expected parameters during the PCM diagnostic monitoring cycle.

Symptoms

• Check Engine Light
• Failed emissions test
• Possible rough idle when EGR activates
• Engine knock at cruise speeds

Common causes

• Stuck or clogged EGR valve
• EGR passages blocked with carbon
• Faulty EGR valve position sensor
• EGR solenoid malfunction
• Vacuum supply issue

Diagnostic steps

1. Command EGR valve open with scan tool and check engine response
2. Inspect EGR valve and passages for carbon buildup
3. Test EGR solenoid operation
4. Check vacuum supply to EGR valve
5. Clean EGR valve and passages

Repair notes

Clean or replace the EGR valve and clean all EGR passages.

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