What does code P1144 mean?

Q: What does code P1144 mean?

HO2S Bank 1 Sensor 3 Rich Or High Voltage. P1144 on GM vehicles indicates that the powertrain control module has detected a rich condition or excessively high voltage signal from the downstream oxygen sensor on bank 1, sensor 3. This sensor monitors the efficiency of the catalytic converter, and a high voltage reading means the exhaust gas is richer than expected or the sensor circuit is reporting a false rich signal.

DTC codes / GM codes / P1144

P1144 · GMHO2S Bank 1 Sensor 3 Rich Or High Voltage

P1144 on GM vehicles indicates that the powertrain control module has detected a rich condition or excessively high voltage signal from the downstream oxygen sensor on bank 1, sensor 3. This sensor monitors the efficiency of the catalytic converter, and a high voltage reading means the exhaust gas is richer than expected or the sensor circuit is reporting a false rich signal.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

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