P1212 BUICK, CADILLAC, CHEVROLET, GMC: MASS AIR FLOW CIRCUIT INTERMITTENT LOW
POST UPDATED IN February, 2023
P1212 BUICK, CADILLAC, CHEVROLET, GMC: MASS AIR FLOW CIRCUIT INTERMITTENT LOW
The electric fuel injection system has the MAF sensor (Mass Air Flow Sensor). This sensor is installed between the intake manifold and the air filter. It measures how much air enters the engine or the airflow. An electronic chip is installed inside the sensor, which translates the current into a voltage signal that is provided to the Powertrain Control Module (PCM). The PCM uses it to calculate how much fuel to inject to maintain the air-fuel ratio at its optimum level.
The Air Mass Flow Sensor has a wire that is electronically heated. This is known as a hot wire. When the engine is idling, a small amount of air flows around the wire, so a very low current is necessary to keep the wire warm. When the throttle is pressed, the throttle opens and allows more air to flow over the wire, requiring more electric current to keep it hot, which is proportional to the amount of airflow.
The P1212 OBDII diagnostic code setting occurs when an irregular operation is detected in the mass airflow circuit, which has experienced voltages that are not within the manufacturer’s allowable voltages.
Reasons for setting the P1212 OBD2 DTC P1212 OBD2 code:
Steps for troubleshooting the P1212 OBDII fault code: