OBD A Camshaft Position Control Performance Bank 1
What it means
P25DF stands for A Camshaft Position Control Performance Bank 1. P25DF is a P code, so the fault sits in the engine, transmission and emissions systems. For P25DF, the second digit places it in speed and idle control. For P25DF, work through the cause list below, cheapest checks first.
What to check first
For P25DF, compare the reading on bank 1 against the other bank on the same scan tool, because a bank that reads differently from its twin is the fault.
Check these first
- P25DF: Faulty sensor or actuator in the control circuit
- P25DF: Wiring, connector, or fuse problem for the affected output
- P25DF: Low or unstable system voltage from the battery or charging system
- P25DF: Failed PCM/ECM or a software error
- P25DF: Poor ground connection for the control module
What to do next
P25DF is a fault in the speed and idle control system. The steps below are general, so what actually failed on your vehicle may not be what P25DF names.
- P25DF: Verify battery voltage and charging system health first
- P25DF: Read all related module codes with an OBD-II scanner
- P25DF: Inspect wiring, connectors, and grounds for the affected circuit
- P25DF: Test the sensor or actuator with live data and actuation commands
- P25DF: Check for PCM software updates or TSBs before replacing modules
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.