P25xx fault codes: Auxiliary inputs and charging

The charging system, the low-pressure fuel sensor and the position sensor of the turbo's boost control: inputs that feed the engine control unit.

How to read this code

The letter P names the system: Powertrain. The next digit, 5, locates the fault: auxiliary inputs and charging.

These codes are generic: they mean the same thing on every make. Some manufacturer tools display them with a two-digit suffix, such as P0101-00 or P010100: the suffix refines the fault type, and the base code keeps its meaning.

The codes of this family, part by part

Alternator (charging system)

• P2500Generator Lamp/L-Terminal Circuit Low
• P2501Generator Lamp/L-Terminal Circuit High
• P2502Charging System Voltage
• P2503Charging System Voltage Low
• P2504Charging System Voltage High

Fuel pump

• P2539Low Pressure Fuel System Sensor Circuit
• P2540Low Pressure Fuel System Sensor Circuit Range/Performance

Turbo boost control

• P2563Turbocharger Boost Control Position Sensor A Circuit Range/Performance
• P2564Turbocharger Boost Control Position Sensor A Circuit Low
• P2565Turbocharger Boost Control Position Sensor A Circuit High