Possible Causes
- Crankshaft Position (CKP) sensor malfunction.
- EGR boost sensor malfunction.
- Engine Coolant Temperature (ECT) sensor malfunction.
- Intake Air Temperature (IAT) sensor malfunction.
- Mass Airflow (MAF) sensor malfunction.
- PCM malfunction.
- Short circuit between PCM and VCTS solenoid valve.
- Throttle Position (TP) sensor malfunction.
- Variable Tumble Control System (VTCS) solenoid valve malfunction.
- VTCS shutter valve stuck closed.
- VTCS shutter valve actuator stuck closed.