OBD Alternative Fuel Rail Pressure Sensor Circuit Low
What it means
P01A5 stands for Alternative Fuel Rail Pressure Sensor Circuit Low. P01A5 is a P code, so the fault sits in the engine, transmission and emissions systems. For P01A5, the second digit places it in fuel and air metering. For P01A5, work through the cause list below, cheapest checks first.
Where it lives
For P01A5, the sensor sits on the circuit this code reports. The description of P01A5 reports a fault at the sensor.
What to check first
For P01A5, pull the connector and inspect the terminals for spread, corrosion or backed-out pins before testing anything else.
Check these first
- P01A5: Faulty or contaminated sensor in the fuel/air metering circuit
- P01A5: Damaged or shorted wiring or connector for the affected circuit
- P01A5: Vacuum leak or intake system restriction
- P01A5: Failing fuel pump, injector, or fuel pressure regulator
What to do next
P01A5 belongs to the fuel and air metering system. These are the general steps for P01A5, and the exact cause on your vehicle can differ.
- P01A5: Read freeze frame data and related codes with an OBD-II scanner
- P01A5: Inspect the affected sensor wiring and connector for damage
- P01A5: Compare live sensor readings (fuel trim, airflow, temperatures) to manufacturer specs
- P01A5: Smoke test the intake system if lean or vacuum conditions are suspected
- P01A5: Replace the failed component after confirming it with live data
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.