What does code P1212 mean?

Q: What does code P1212 mean?

Mass Airflow Circuit Intermittent Low. P1212 on a GM vehicle means the powertrain control module (PCM) has detected an intermittent low signal from the mass airflow (MAF) sensor circuit, where the reported airflow drops below the expected range for the current operating conditions. The PCM sets this code when the low signal is not constant but returns often enough to fail its rationality and continuity checks.

DTC codes / GM codes / P1212

P1212 · GMMass Airflow Circuit Intermittent Low

P1212 on a GM vehicle means the powertrain control module (PCM) has detected an intermittent low signal from the mass airflow (MAF) sensor circuit, where the reported airflow drops below the expected range for the current operating conditions. The PCM sets this code when the low signal is not constant but returns often enough to fail its rationality and continuity checks.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.