Code Definition

P1159 — Fuel Stepper Motor Malfunction

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

About P1159

P1159 is a manufacturer-specific powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

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.

P1159 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 code sets when the powertrain control module (PCM) detects a malfunction in the fuel stepper motor, which is typically used in alternative fuel systems (such as CNG or LPG) to regulate fuel flow. A failure in this component can lead to improper fuel metering, rough running, or fuel delivery issues.

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