Signal wire shorted to voltage; Faulty MAF sensor; Poor ground connection; Electrical interference from nearby components or aftermarket wiring.

Mass air flow (MAF)

P0103 Mass or Volume Air Flow (MAF) Circuit High Input

Q: What does P0103 mean?

Mass or Volume Air Flow (MAF) Circuit High Input. The ECU monitors the output signal of the MAF sensor. P0103 is set when the signal stays above the maximum expected value.

The ECU monitors the output signal of the MAF sensor. P0103 is set when the signal stays above the maximum expected value.

Common causes

Signal wire shorted to voltage
Faulty MAF sensor
Poor ground connection
Electrical interference from nearby components or aftermarket wiring

Typical symptoms

Check engine light (MIL) on
Rough running or hesitation
Reduced power or limp mode
Black smoke on diesel engines

P0103 and NuoVolta

If the MAF sensor has been removed for off-road or motorsport use, where permitted by law, the NuoVolta MAF Removal solution adjusts the ECU calibration to run without the MAF signal and the DTC removal feature can disable this code. Otherwise, check the sensor ground and wiring first.

MAF Removal Available for 234 ECUs

Related codes

P0101Mass or Volume Air Flow (MAF) Circuit Range/Performance P0102Mass or Volume Air Flow (MAF) Circuit Low Input

Diagnose and repair real faults first. Removing or disabling emission systems is only permitted where allowed by law, for example for off-road or motorsport use.