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Powertrain code references — Page 77.

Engine, transmission and powertrain diagnostic references. Exact vehicle and module context still matters.

9,891 code references in powertrain

Generic OBD-II
P254F

Engine Hood Switch Circuit

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Generic OBD-II
P2550

Torque Management Request Input Signal B Low

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Generic OBD-II
P2551

Torque Management Request Input Signal B High

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Generic OBD-II
P2552

Throttle/Fuel Inhibit A Circuit

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Generic OBD-II
P2553

Throttle/Fuel Inhibit A Circuit Range/Performance

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Generic OBD-II
P2554

Throttle/Fuel Inhibit A Circuit Low

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Generic OBD-II
P2555

Throttle/Fuel Inhibit A Circuit High

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Generic OBD-II
P2556

Engine Coolant Level Sensor/Switch Circuit

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Generic OBD-II
P2557

Engine Coolant Level Sensor/Switch Circuit Range/Performance

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Generic OBD-II
P2558

Engine Coolant Level Sensor/Switch Circuit Low

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Generic OBD-II
P2559

Engine Coolant Level Sensor/Switch Circuit High

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Generic OBD-II
P255A

PTO Speed Selector Sensor/Switch 2 Circuit/Open

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Generic OBD-II
P255B

PTO Speed Selector Sensor/Switch 2 Range/Performance

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Generic OBD-II
P255C

PTO Speed Selector Sensor/Switch 2 Circuit Low

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Generic OBD-II
P255D

PTO Speed Selector Sensor/Switch 2 Circuit High

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Generic OBD-II
P255E

PTO Speed Selector Sensor/Switch 2 Circuit Intermittent/Erratic

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Generic OBD-II
P255F

A/C Request A Circuit Range/Performance

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Generic OBD-II
P2560

Engine Coolant Level Low

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Generic OBD-II
P2561

A/C Control Module Requested MIL Illumination

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Generic OBD-II
P2562

Turbocharger Boost Control Position Sensor A Circuit

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Generic OBD-II
P2563

Turbocharger Boost Control Position Sensor A Circuit Range/Performance

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Generic OBD-II
P2564

Turbocharger Boost Control Position Sensor A Circuit Low

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Generic OBD-II
P2565

Turbocharger Boost Control Position Sensor A Circuit High

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Generic OBD-II
P2566

Turbocharger Boost Control Position Sensor A Circuit Intermittent

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Generic OBD-II
P2567

Direct Ozone Reduction Catalyst Temperature Sensor Circuit

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Generic OBD-II
P2568

Direct Ozone Reduction Catalyst Temperature Sensor Circuit Range/Performance

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Generic OBD-II
P2569

Direct Ozone Reduction Catalyst Temperature Sensor Circuit Low

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Generic OBD-II
P256A

Engine Idle Speed Selector Sensor/Switch Circuit/Open

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Generic OBD-II
P256B

Engine Idle Speed Selector Sensor/Switch Range/Performance

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Generic OBD-II
P256C

Engine Idle Speed Selector Sensor/Switch Circuit Low

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Generic OBD-II
P256D

Engine Idle Speed Selector Sensor/Switch Circuit High

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Generic OBD-II
P256E

Engine Idle Speed Selector Sensor/Switch Circuit Intermittent/Erratic

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Generic OBD-II
P256F

A/C Request B Circuit Range/Performance

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Generic OBD-II
P2570

Direct Ozone Reduction Catalyst Temperature Sensor Circuit High

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Generic OBD-II
P2571

Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P2572

Direct Ozone Reduction Catalyst Deterioration Sensor Circuit

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Generic OBD-II
P2573

Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance

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Generic OBD-II
P2574

Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Low

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Generic OBD-II
P2575

Direct Ozone Reduction Catalyst Deterioration Sensor Circuit High

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Generic OBD-II
P2576

Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P2577

Direct Ozone Reduction Catalyst Efficiency Below Threshold

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Generic OBD-II
P2578

Turbocharger/Supercharger Speed Sensor A Circuit

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Generic OBD-II
P2579

Turbocharger/Supercharger Speed Sensor A Circuit Range/Performance

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Generic OBD-II
P257A

Vacuum Reservoir Control Circuit/Open

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Generic OBD-II
P257B

Vacuum Reservoir Control Circuit Low

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Generic OBD-II
P257C

Vacuum Reservoir Control Circuit High

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Generic OBD-II
P257D

Engine Hood Switch Circuit Range/Performance

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Generic OBD-II
P257E

Engine Hood Switch Circuit Low

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Generic OBD-II
P257F

Engine Hood Switch Circuit High

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Generic OBD-II
P2580

Turbocharger/Supercharger Speed Sensor A Circuit Low

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Generic OBD-II
P2581

Turbocharger/Supercharger Speed Sensor A Circuit High

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Generic OBD-II
P2582

Turbocharger/Supercharger Speed Sensor A Circuit Intermittent

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Generic OBD-II
P2583

Cruise Control Front Distance Range Sensor Single Sensor or Center

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Generic OBD-II
P2584

Fuel Additive Control Module Requested MIL Illumination

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Generic OBD-II
P2585

Fuel Additive Control Module Warning Lamp Request

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Generic OBD-II
P2586

Turbocharger Boost Control Position Sensor B Circuit

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Generic OBD-II
P2587

Turbocharger Boost Control Position Sensor B Circuit Range/Performance

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Generic OBD-II
P2588

Turbocharger Boost Control Position Sensor B Circuit Low

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Generic OBD-II
P2589

Turbocharger Boost Control Position Sensor B Circuit High

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Generic OBD-II
P258A

Vacuum Pump Control Circuit A/Open

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Generic OBD-II
P258B

Vacuum Pump Control Circuit A Range/Performance

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Generic OBD-II
P258C

Vacuum Pump Control Circuit A Low

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Generic OBD-II
P258D

Vacuum Pump Control Circuit A High

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Generic OBD-II
P258E

PTO Enable Switch Performance

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Generic OBD-II
P258F

Torque Management Request Output Signal

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Generic OBD-II
P2590

Turbocharger Boost Control Position Sensor B Circuit Intermittent/Erratic

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Generic OBD-II
P2591

Cruise Control Front Distance Range Sensor Left

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Generic OBD-II
P2592

Cruise Control Front Distance Range Sensor Right

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Generic OBD-II
P2593

Turbocharger Speed Sensor B Circuit

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Generic OBD-II
P2594

Turbocharger Speed Sensor B Circuit Range/Performance

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Generic OBD-II
P2595

Turbocharger Speed Sensor B Circuit Low

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Generic OBD-II
P2596

Turbocharger Speed Sensor B Circuit High

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Generic OBD-II
P2597

Turbocharger Speed Sensor B Circuit Intermittent

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Generic OBD-II
P2598

Turbocharger Boost Control Position Sensor A Performance - Stuck Low

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Generic OBD-II
P2599

Turbocharger Boost Control Position Sensor A Performance - Stuck High

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Generic OBD-II
P259A

Turbocharger Boost Control Position Sensor B Performance - Stuck Low

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Generic OBD-II
P259B

Turbocharger Boost Control Position Sensor B Performance - Stuck High

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Generic OBD-II
P259C

Excessive Time To Enter Closed Loop Turbocharger A Boost Control

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Generic OBD-II
P259D

Excessive Time To Enter Closed Loop Turbocharger B Boost Control

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Generic OBD-II
P259E

Turbocharger A Boost Control Position At Low Limit

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Generic OBD-II
P259F

Turbocharger A Boost Control Position At High Limit

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Generic OBD-II
P25A0

Turbocharger B Boost Control Position At Low Limit

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Generic OBD-II
P25A1

Turbocharger B Boost Control Position At High Limit

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Generic OBD-II
P25A2

Brake System Control Module A Requested MIL Illumination

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Generic OBD-II
P25A3

Engine Hood Open

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Generic OBD-II
P25A4

Fuel Mode Select Switch Circuit

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Generic OBD-II
P25A5

Fuel Mode Select Switch Performance

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Generic OBD-II
P25A6

Fuel Mode Select Switch Circuit Low

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Generic OBD-II
P25A7

Fuel Mode Select Switch Circuit High

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Generic OBD-II
P25A8

Fuel Mode Select Switch Circuit Intermittent/Erratic

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Generic OBD-II
P25A9

Piston Cooling Oil Control Circuit/Open

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Generic OBD-II
P25AA

Piston Cooling Oil Control Circuit Low

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Generic OBD-II
P25AB

Piston Cooling Oil Control Circuit High

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Generic OBD-II
P25AC

Piston Cooling Oil Control Circuit Performance/Stuck Off

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Generic OBD-II
P25AD

Piston Cooling Oil Control Circuit Stuck On

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Generic OBD-II
P25AE

Piston Cooling Oil Pressure Too Low

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Generic OBD-II
P25AF

Coolant Temperature Control Module Requested MIL Illumination

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Generic OBD-II
P25B0

Fuel Level Sensor A Stuck

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Generic OBD-II
P25B1

Fuel Level Sensor B Stuck

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Generic OBD-II
P25B2

Fuel Level Sensor A or B Stuck

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These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.