P1211 BUICK, CADILLAC, CHEVROLET, GMC: MASS AIR FLOW CIRCUIT INTERMITTENT HIGH
POST UPDATED IN June, 2023
P1211 BUICK, CADILLAC, CHEVROLET, GMC: MASS AIR FLOW CIRCUIT INTERMITTENT HIGH
The MAF (Mass Air Flow Sensor) is a device installed in the intake manifold that assists the fuel injection system. The MAF sensor measures how much air enters the engine. Then, it sends that data via an electrical signal to the PCM (Powertrain Control Module) to determine the amount of fuel that needs to be injected to achieve a stoichiometric air/fuel mixture.
When the engine is idling, a certain amount of air passes near a wire of the MAF sensor. This wire is electronically heated, so a level of current is required to be sent at idle to maintain this temperature. When the accelerator pedal is depressed, more air flows around the wire, so more current is required to keep the wire at its proper temperature, which happens to be proportional to the airflow.
When the DTC P1211 OBDII code is set, it is due to out-of-range voltages has been found in the MAF Sensor circuit, becoming excessively above the allowed values.
The P1211 OBD2 diagnostic code is set for one of the following reasons:
To solve the P1211 OBDII fault code, try this: