Code Definition

P1271 — Accelerator pedal position sensor 1/2 signal fault

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

About P1271

P1271 is a manufacturer-specific powertrain diagnostic trouble code recorded for Isuzu vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1271 is stored, the module has detected 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.

P1271 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

The accelerator pedal in an electronic throttle system contains two accelerator pedal position sensors that report the driver demand to the ECM, providing redundancy for this safety critical input. DTC P1271 sets when the ECM detects that the accelerator pedal position sensor 1 and sensor 2 signals do not agree within their expected relationship. The two sensors operate on separate references and grounds and move with a defined ratio so the ECM can verify pedal demand, and a loss of correlation makes the ECM disregard the input and limit power. The driver typically experiences reduced power, p...

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