OBD Fuel Mode Select Switch Circuit High
What it means
P25A7 stands for Fuel Mode Select Switch Circuit High. P25A7 is a P code, so the fault sits in the engine, transmission and emissions systems. For P25A7, the second digit places it in speed and idle control. For P25A7, work through the cause list below, cheapest checks first.
Where it lives
For P25A7, the switch sits on the circuit this code reports. The description of P25A7 reports a fault at the switch.
What to check first
For P25A7, pull the connector and inspect the terminals for spread, corrosion or backed-out pins before testing anything else.
Check these first
- P25A7: Faulty sensor or actuator in the control circuit
- P25A7: Wiring, connector, or fuse problem for the affected output
- P25A7: Low or unstable system voltage from the battery or charging system
- P25A7: Failed PCM/ECM or a software error
- P25A7: Poor ground connection for the control module
What to do next
P25A7 reports from the speed and idle control system. These steps cover P25A7 in general, and the exact cause on your vehicle can differ from the cause named above.
- P25A7: Verify battery voltage and charging system health first
- P25A7: Read all related module codes with an OBD-II scanner
- P25A7: Inspect wiring, connectors, and grounds for the affected circuit
- P25A7: Test the sensor or actuator with live data and actuation commands
- P25A7: Check for PCM software updates or TSBs before replacing modules
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.