What this code means

The turbo compressor recirculation valve (CRV) that prevents compressor surge during rapid throttle closure is not functioning within specification.

Symptoms

• Compressor flutter or chirping on throttle lift
• Reduced turbo longevity
• Slight hesitation on re-acceleration after lift
• Turbo surge noise under certain conditions
• Boost response delayed after throttle reapplication

Common causes

• CRV diaphragm torn
• CRV spring tension incorrect
• Vacuum actuator line leaking
• Solenoid control circuit fault
• Valve stuck partially open reducing boost

Diagnostic steps

1. Listen for compressor surge during throttle transitions
2. Test CRV vacuum actuator operation
3. Inspect CRV diaphragm and spring
4. Check control solenoid operation
5. Monitor boost recovery after throttle lift

Repair notes

Replace compressor recirculation valve. Check vacuum lines to actuator. Upgraded aftermarket valves are available but must match boost specifications.

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