P25xx OBD-II Trouble Codes
P25xx OBD-II Trouble Codes
This is a list of P25xx OBD-II Diagnostic Trouble Codes (DTCs). They all start with P25 (eg P2502, P2509, etc.). The first two P2 characters denote that they are generic transmission-related codes. The codes below are considered generic as they apply to all makes / models of OBD-II vehicles, although the specific diagnostic and repair steps may differ.
We have literally thousands of other codes listed on the site, use the links below to navigate to other code lists. If you can't find what you are looking for, use our search engine or ask a question on the forums.
Quick links to other trouble codes (starting with): P00xx: P01xx: P02xx: P03xx: P04xx: P05xx: P06xx: P07xx: P08xx: P09xx: P0Axx: P0Bxx: P0Cxx: P1 ***: P20xx: P21xx: P22xx: P23xx: P24xx: P25xx: P26xx: P27xx: P28 / P29 / P2A / P2B: P34xx
For all other codes not listed in the links above or below, see our list of major trouble codes.
P2500-P2599 Fault codes
- P2500 Alternator Lamp / L-Terminal Circuit Low
- P2501 Alternator Lamp / L-Terminal Circuit High
- P2502 Charging System Voltage
- P2503 Low voltage charging system
- P2504 Charging system high voltage
- P2505 ECM / PCM Power Input Signal
- P2506 ECM / PCM Power Input Range / Performance
- P2507 ECM / PCM Power Input Signal Low
- P2508 ECM / PCM Power Input Signal High
- P2509 ECM / PCM Power Input Intermittent
- P250A Engine Oil Level Sensor Circuit
- P250B Engine oil level sensor circuit out of range / performance
- P250C Low engine oil level sensor circuit
- P250D Engine Oil Level Sensor Circuit High
- P250E Intermittent / Intermittent Engine Oil Level Sensor Circuit
- P250F Engine oil level too low
- P2510 ECM / PCM Power Relay Sensor Circuit Out of Performance Range
- P2511 ECM / PCM Power Relay Sensor Circuit Malfunction
- P2512 Event Data Logger Request Circuit / Open
- P2513 Event Data Logger Request Circuit Low
- P2514 Event data logger request circuit high
- P2515 Air Conditioner Refrigerant Pressure Sensor "B"
- P2516 A / C Refrigerant Pressure Sensor "B" Circuit Range / Performance
- P2517 Low indicator circuit of the refrigerant pressure sensor "B" of the air conditioning system
- P2518 A high air conditioner refrigerant pressure sensor "B"
- P2519 A/C Request "A" Circuit
- P251A PTO Enable Switch Circuit / Open
- P251B PTO Enable Switch Circuit Low
- P251C PTO Enable Switch Circuit High
- P251D PTO Engine Shutdown Circuit / Open
- P251E PTO Engine Shutdown Circuit Low
- P251F PTO Engine Shutdown Circuit High
- P2520 A / C Request «A» Circuit Low
- P2521 A / C Request «A» Circuit High
- P2522 A/C Request "B" Circuit
- P2523 A / C Request «B» Circuit Low
- P2524 A / C Request «B» Circuit High
- P2525 Vacuum Tank Pressure Sensor Circuit
- P2526 Vacuum reservoir pressure sensor circuit out of range / performance
- P2527 Low vacuum tank pressure sensor circuit
- P2528 A high vacuum tank pressure sensor circuit
- P2529 Vacuum Tank Pressure Sensor Circuit Malfunction
- P252A Engine Oil Quality Sensor Circuit
- P252B Engine Oil Quality Sensor Circuit Range / Performance
- P252C Low engine oil quality sensor circuit
- P252D High signal level in the engine oil quality sensor circuit
- P252E Unstable / unstable engine oil quality circuit
- P252F Engine oil level too high
- P2530 Ignition Switch Working Position Circuit
- P2531 Ignition Switch Run Position Circuit Low
- P2532 Ignition switch operates, circuit position high
- P2533 Ignition Switch Run / Start Position Circuit
- P2534 Ignition Switch Run / Start Position Circuit Low
- P2535 Ignition Switch Run / Start Position Circuit High
- P2536 Auxiliary Ignition Switch Position Circuit
- P2537 Ignition Switch Auxiliary Circuit Position Circuit Low
- P2538 Ignition Switch Auxiliary Circuit Position Circuit High
- P2539 Low Pressure Fuel System Sensor Circuit
- P253A Power take-off sensor circuit / open
- P253B PTO Sensor Circuit Range / Performance
- P253C PTO Sense Circuit Low
- P253D PTO Sense Circuit High
- P253E Unstable / unstable power take-off sensor circuit
- P253F Engine oil deteriorated
- P2540 Fuel System Sensor Circuit Low Pressure Out of Range / Performance
- P2541 Low pressure in the fuel system sensor circuit, low signal level
- P2542 Low pressure in the fuel system sensor circuit, high voltage
- P2543 Low pressure in the fuel system sensor circuit is intermittent
- P2544 Torque Control Request Input "A"
- P2545 Torque Control Request Input "A" Range / Performance
- P2546 Torque Control Request Input "A" Low
- P2547 Torque Control Request Input "A" High
- P2548 Torque Control Request Input "B"
- P2549 Torque Control Request Input "B" Range / Performance
- P254A PTO Speed Sensor / Switch 1 Circuit / Open
- P254B PTO Speed Sensor / Switch 1 Range / Performance
- P254C PTO speed selector / switch 1 circuit low signal
- P254D PTO Speed Sensor / Switch 1 Circuit High
- P254E Unstable / unstable sensor / PTO speed switch 1 circuit
- P254F Engine Bonnet Switch Circuit
- P2550 Torque Control Request Input "B" Low
- P2551 Torque Control Request Input "B" High
- P2552 Throttle / Fuel Lock Circuit
- P2553 Throttle / Fuel Lock Circuit Range / Performance
- P2554 Low Throttle / Fuel Lock Circuit
- P2555 Throttle / Fuel Lock Circuit High
- P2556 Engine Coolant Level Sensor / Switch Circuit
- P2557 Engine Coolant Level Sensor / Switch Range / Circuit Performance
- P2558 Engine Coolant Level Sensor / Switch Circuit Low
- P2559 High signal level sensor / engine coolant switch
- P255A PTO Speed Sensor / Switch 2 Circuit / Open
- P255B PTO Speed Sensor / Switch 2 Range / Performance
- P255C PTO speed selector / switch 2 circuit low signal
- P255D PTO Speed Sensor / Switch 2 Circuit High
- P255E Unstable / unstable sensor / PTO speed switch 2 circuit
- P255F A / C Request "A" Circuit Range / Performance
- P2560 Engine Coolant Level Low
- P2561 The air conditioning control module has requested a warning lamp backlight
- P2562 Turbocharger boost control position sensor "A"
- P2563 Turbocharger boost control position sensor "A" Circuit Range / Performance
- P2564 Turbocharger boost control position sensor "A", low signal
- P2565 Turbocharger boost control position sensor "A", high signal in the circuit
- P2566 Turbocharger Boost Control Position Sensor "A" Circuit Intermittent
- P2567 Direct Ozone Recovery Catalyst Temperature Sensor Circuit
- P2568 Ozone Direct Recovery Catalyst Temperature Sensor Circuit Out of Range / Performance
- P2569 Ozone Direct Recovery Catalyst Temperature Sensor Circuit Low
- P256A Engine idle speed sensor / switch circuit / open
- P256B Engine Idle Sensor / Switch Range / Performance
- P256C Low engine idle speed sensor / switch
- P256D High engine idle speed sensor / switch
- P256E Unstable / unstable engine idle speed switch sensor
- P256F A / C Request "B" Circuit Range / Performance
- P2570 Direct Ozone Reduction Catalyst Temperature Sensor Circuit High Signal
- P2571 Intermittent / unstable direct action ozone recovery catalyst temperature sensor circuit
- P2572 Ozone Direct Recovery Catalyst Wear Sensor Circuit
- P2573 Ozone Direct Recovery Catalyst Wear Sensor Circuit Out of Range / Performance
- P2574 Low Ozone Direct Recovery Catalyst Wear Sensor Circuit
- P2575 Direct Ozone Reduction Catalyst Wear Sensor Circuit High Signal
- P2576 Intermittent / intermittent signal of direct / unstable catalyst wear sensor circuit for reducing ozone emissions
- P2577 Efficiency of the catalyst for direct reduction of ozone below the threshold
- P2578 Turbocharger Speed Sensor Circuit
- P2579 Turbocharger Speed Sensor Circuit Range / Performance
- P257A Vacuum reservoir control circuit / open
- P257B Low rate of the vacuum reservoir control circuit
- P257C Vacuum reservoir control circuit - high
- P257D Engine Bonnet Switch Circuit Malfunction / Performance
- P257E Low engine hood switch circuit
- P257F Engine Bonnet Switch Circuit High
- P2580 Low turbocharger speed sensor circuit
- P2581 A high turbocharger speed sensor circuit
- P2582 Unstable Turbocharger Speed Sensor Circuit
- P2583 Cruise Control Front Distance Range Sensor Single Sensor or Center
- P2584 Fuel Additive Control Module Requested By MIL
- P2585 Fuel Additive Control Module Warning Lamp Request
- P2586 Turbocharger boost control position sensor "B"
- P2587 Turbocharger boost control position sensor "B" Circuit Range / Performance
- P2588 Turbocharger boost control position sensor "B" Low signal in the circuit
- P2589 Turbocharger boost control position sensor "B", high signal
- P258A Vacuum pump control circuit / open
- P258B Vacuum pump control range / performance
- P258C Low rate of the vacuum pump control circuit
- P258D Vacuum pump control circuit - high
- P258E PTO engaging switch operation
- P258F Torque Control Request Output
- P2590 Turbocharger boost control position sensor "B" Unstable / unstable circuit
- P2591 Cruise Control Front Distance Range Sensor Left
- P2592 Cruise Control Front Distance Range Sensor, Right
- P2593 - P25FF ISO/SAE Reserved
Next: Trouble Codes P2600-P2699
Quick links to other trouble codes (starting with): P00xx: P01xx: P02xx: P03xx: P04xx: P05xx: P06xx: P07xx: P08xx: P09xx: P0Axx: P0Bxx: P0Cxx: P1 ***: P20xx: P21xx: P22xx: P23xx: P24xx: P25xx: P26xx: P27xx: P28 / P29 / P2A / P2B: P34xx
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