What does code P1203 mean?

Q: What does code P1203 mean?

(Alternative Fuel) Gas Mass Sensor Circuit High Frequency. P1203 on Chrysler vehicles indicates that the powertrain control module (PCM) has detected an abnormally high frequency signal from 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 this frequency input against expected values and sets the code when the signal exceeds the calibrated high threshold, often due to a sensor or wiring fault.

DTC codes / Chrysler codes / P1203

P1203 · Chrysler(Alternative Fuel) Gas Mass Sensor Circuit High Frequency

P1203 on Chrysler vehicles indicates that the powertrain control module (PCM) has detected an abnormally high frequency signal from 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 this frequency input against expected values and sets the code when the signal exceeds the calibrated high threshold, often due to a sensor or wiring fault.

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.