Code Definition

P1144 — O2 Sensor Reading Rich or High Voltage (Bank 1 Sensor 3)

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: GM

About P1144

P1144 is a manufacturer-specific powertrain diagnostic trouble code recorded for GM vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1144 is stored, the module has detected a signal or supply voltage higher than the expected operating range; a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1144 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This General Motors specific code applies to the Bank 1 Sensor 3 oxygen sensor, the third sensor placed far down the exhaust on vehicles with an extra catalyst section, and it is the rich counterpart to P1143. P1144 sets when the PCM sees the Sensor 3 signal biased toward rich, staying at a high voltage rather than the value expected at that point in the exhaust. A persistently high reading can indicate a contaminated sensor, a signal wire shorted to voltage, or a genuinely rich exhaust reaching that far down the system. The sensor supports catalyst monitoring and trim, so symptoms are usually...

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