P1101: Intake Air Flow System Performance (GM)
Severity: moderate
What it means: On many GM vehicles, P1101 means the measured airflow (MAF/MAP correlation) does not match what the PCM expects for the throttle and RPM.
Safe to drive? Often drivable but can stall or run rough, especially with vacuum leaks, dirty sensors, or cold-weather intake icing on 1.4L turbos.
Common symptoms
- Check engine light
- Rough idle
- Hesitation or stalling
- Other lean/airflow codes
Likely causes, ranked
- MAF/MAP performance or contaminationDIY
- Intake/boost leaksShop
- PCV/icing issues on some 1.4L turbosShop
Vehicle-specific notes
- 2015–2018 Chevrolet Trax: P1101 appeared with cold-weather stalling and lean codes on Trax Forum; related to airflow metering when the intake path is compromised. Read the full answer · Source
What it means: On many GM vehicles, P1101 means the measured airflow (MAF/MAP correlation) does not match what the PCM expects for the throttle and RPM.
Severity: Moderate. Safe to drive? Often drivable but can stall or run rough, especially with vacuum leaks, dirty sensors, or cold-weather intake icing on 1.4L turbos.
DIY or shop?
DIY for air filter and basic hose checks; shop for smoke testing and turbo intake work.
Before you replace parts
- Read all stored codes and freeze-frame data, not just this one.
- Check your VIN for recalls, service bulletins and extended coverage.
- Inspect wiring and connectors for the related sensor or part before buying parts.
- Clear the code only after a repair, then confirm it stays off.
Safety / mechanic note
Verify with a mechanic. Stalling risk if airflow metering is far off. A code points to a circuit or system, not always a specific part.