Diagnostic Trouble Code
P1101 — Intake Air Flow System Performance
Intake Air Flow System Performance
Definition
The intake air flow system is not performing within the expected range. This is a manufacturer-specific code (common on GM vehicles) that indicates the actual airflow does not match the ECM's calculated expected airflow.
Common Causes
- Vacuum leak
- Dirty or faulty MAF sensor
- Restricted air filter
- Throttle body malfunction
- PCV system leak