What does code P1201 mean?

P1201 · Chrysler(Alternative Fuel) Gas Mass Sensor Circuit Range/Performance

P1201 on Chrysler vehicles indicates that the powertrain control module (PCM) has detected a range or performance fault in the gas mass sensor circuit, which is used on alternative fuel vehicles to measure the mass of gaseous fuel entering the engine. The PCM compares the sensor signal against expected values and sets this code when the reading falls outside the acceptable range or behaves erratically.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

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