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Powertrain code references — Page 87.

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

9,891 code references in powertrain

Generic OBD-II
P2A4E

Alternative Fuel Temperature Sensor Circuit High

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Generic OBD-II
P2A4F

Alternative Fuel Temperature Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P2A50

Alternative Fuel Vaporizer A Outlet Temperature Sensor Circuit

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Generic OBD-II
P2A51

Alternative Fuel Vaporizer A Outlet Temperature Sensor Range/Performance

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Generic OBD-II
P2A52

Alternative Fuel Vaporizer A Outlet Temperature Sensor Circuit Low

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Generic OBD-II
P2A53

Alternative Fuel Vaporizer A Outlet Temperature Sensor Circuit High

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Generic OBD-II
P2A54

Alternative Fuel Vaporizer A Outlet Temperature Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P2A55

Alternative Fuel Vaporizer B Outlet Temperature Sensor Circuit

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Generic OBD-II
P2A56

Alternative Fuel Vaporizer B Outlet Temperature Sensor Range/Performance

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Generic OBD-II
P2A57

Alternative Fuel Vaporizer B Outlet Temperature Sensor Circuit Low

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Generic OBD-II
P2A58

Alternative Fuel Vaporizer B Outlet Temperature Sensor Circuit High

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Generic OBD-II
P2A59

Alternative Fuel Vaporizer B Outlet Temperature Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P2A5A

Alternative Fuel Vaporizer C Outlet Temperature Sensor Circuit

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Generic OBD-II
P2A5B

Alternative Fuel Vaporizer C Outlet Temperature Sensor Range/Performance

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Generic OBD-II
P2A5C

Alternative Fuel Vaporizer C Outlet Temperature Sensor Circuit Low

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Generic OBD-II
P2A5D

Alternative Fuel Vaporizer C Outlet Temperature Sensor Circuit High

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Generic OBD-II
P2A5E

Alternative Fuel Vaporizer C Outlet Temperature Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P2A5F

Alternative Fuel Tank B Level Sensor Circuit

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Generic OBD-II
P2A60

Alternative Fuel Tank B Level Sensor Range/Performance

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Generic OBD-II
P2A61

Alternative Fuel Tank B Level Sensor Circuit Low

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Generic OBD-II
P2A62

Alternative Fuel Tank B Level Sensor Circuit High

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Generic OBD-II
P2A63

Alternative Fuel Tank B Level Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P2A64

Alternative Fuel Tank C Level Sensor Circuit

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Generic OBD-II
P2A65

Alternative Fuel Tank C Level Sensor Range/Performance

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Generic OBD-II
P2A66

Alternative Fuel Tank C Level Sensor Circuit Low

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Generic OBD-II
P2A67

Alternative Fuel Tank C Level Sensor Circuit High

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Generic OBD-II
P2A68

Alternative Fuel Tank C Level Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P2A69

Alternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Circuit

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Generic OBD-II
P2A6A

Alternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Range/Performance

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Generic OBD-II
P2A6B

Alternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Circuit Low

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Generic OBD-II
P2A6C

Alternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Circuit High

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Generic OBD-II
P2A6D

Alternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P2A6E

Alternative Fuel Rail Pressure Regulator Inlet Pressure Too Low

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Generic OBD-II
P2A6F

Alternative Fuel Rail Pressure Regulator Inlet Pressure Too High

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Generic OBD-II
P2A70

Alternative Fuel Hydraulic Fuel Pump Select Valve Control Circuit

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Generic OBD-II
P2A71

Alternative Fuel Hydraulic Fuel Pump Select Valve Control Range/Performance

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Generic OBD-II
P2A72

Alternative Fuel Hydraulic Fuel Pump Select Valve Control Circuit Low

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Generic OBD-II
P2A73

Alternative Fuel Hydraulic Fuel Pump Select Valve Control Circuit High

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Generic OBD-II
P2A74

Alternative Fuel Hydraulic Fuel Pump Select Valve Control Circuit Intermittent/Erratic

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Generic OBD-II
P2A75

Alternative Fuel Hydraulic Pump Pressure Sensor Circuit

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Generic OBD-II
P2A76

Alternative Fuel Hydraulic Pump Pressure Sensor Range/Performance

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Generic OBD-II
P2A77

Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Low

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Generic OBD-II
P2A78

Alternative Fuel Hydraulic Pump Pressure Sensor Circuit High

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Generic OBD-II
P2A79

Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P2A7A

Alternative Fuel Hydraulic Pressure Sensor Circuit

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Generic OBD-II
P2A7B

Alternative Fuel Hydraulic Pressure Sensor Range/Performance

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Generic OBD-II
P2A7C

Alternative Fuel Hydraulic Pressure Sensor Circuit Low

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Generic OBD-II
P2A7D

Alternative Fuel Hydraulic Pressure Sensor Circuit High

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Generic OBD-II
P2A7E

Alternative Fuel Hydraulic Pressure Sensor Circuit Intermitttent/Erratic

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Generic OBD-II
P2A7F

Alternative Fuel Pump A Compression Stroke Valve Control Circuit/Open

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Generic OBD-II
P2A80

Alternative Fuel Pump A Compression Stroke Valve Control Circuit Range/Performance

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Generic OBD-II
P2A81

Alternative Fuel Pump A Compression Stroke Valve Control Circuit Low

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Generic OBD-II
P2A82

Alternative Fuel Pump A Compression Stroke Valve Control Circuit High

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Generic OBD-II
P2A83

Alternative Fuel Pump B Compression Stroke Valve Control Circuit/Open

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Generic OBD-II
P2A84

Alternative Fuel Pump B Compression Stroke Valve Control Circuit Range/Performance

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Generic OBD-II
P2A85

Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low

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Generic OBD-II
P2A86

Alternative Fuel Pump B Compression Stroke Valve Control Circuit High

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Generic OBD-II
P2A87

Alternative Fuel Pump C Compression Stroke Valve Control Circuit/Open

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Generic OBD-II
P2A88

Alternative Fuel Pump C Compression Stroke Valve Control Circuit Range/Performance

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Generic OBD-II
P2A89

Alternative Fuel Pump C Compression Stroke Valve Control Circuit Low

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Generic OBD-II
P2A8A

Alternative Fuel Pump C Compression Stroke Valve Control Circuit High

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Generic OBD-II
P2A8B

Alternative Fuel Vaporizer A Performance

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Generic OBD-II
P2A8C

Alternative Fuel Vaporizer B Performance

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Generic OBD-II
P2A8D

Alternative Fuel Vaporizer C Performance

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Generic OBD-II
P2A8E

Alternative Fuel Pump A Performance

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Generic OBD-II
P2A8F

Alternative Fuel Pump B Performance

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Generic OBD-II
P2A90

Alternative Fuel Pump C Performance

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Generic OBD-II
P2A91

Alternative Fuel Tank Select Valve A Control Circuit/Open

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Generic OBD-II
P2A92

Alternative Fuel Tank Select Valve A Control Performance

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Generic OBD-II
P2A93

Alternative Fuel Tank Select Valve A Control Circuit Low

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Generic OBD-II
P2A94

Alternative Fuel Tank Select Valve A Control Circuit High

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Generic OBD-II
P2A95

Alternative Fuel Tank Select Valve B Control Circuit/Open

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Generic OBD-II
P2A96

Alternative Fuel Tank Select Valve B Control Circuit Performance

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Generic OBD-II
P2A97

Alternative Fuel Tank Select Valve B Control Circuit Low

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Generic OBD-II
P2A98

Alternative Fuel Tank Select Valve B Control Circuit High

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Generic OBD-II
P2A99

Alternative Fuel Tank Select Valve C Control Circuit/Open

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Generic OBD-II
P2A9A

Alternative Fuel Tank Select Valve C Control Circuit Performance

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Generic OBD-II
P2A9B

Alternative Fuel Tank Select Valve C Control Circuit Low

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Generic OBD-II
P2A9C

Alternative Fuel Tank Select Valve C Control Circuit High

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Generic OBD-II
P2A9D

Alternative Fuel High Pressure System Small Leak

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Generic OBD-II
P2A9E

Alternative Fuel Return Line Valve Control Circuit/Open

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Generic OBD-II
P2A9F

Alternative Fuel Return Line Valve Control Circuit Range/Performance

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Generic OBD-II
P2AA0

Alternative Fuel Return Line Valve Control Circuit Low

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Generic OBD-II
P2AA1

Alternative Fuel Return Line Valve Control Circuit High

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Generic OBD-II
P2AA2

Alternative Fuel Return Line Insufficient Flow

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Generic OBD-II
P2AA3

Cold Start EGR B Flow Insufficient Detected

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Generic OBD-II
P2AA4

Cold Start EGR B Flow Excessive Detected

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Generic OBD-II
P2AA5

EGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 1

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Generic OBD-II
P2AA6

EGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 2

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Generic OBD-II
P2AA7

Engine Coolant Bypass Valve B Position Sensor Circuit

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Generic OBD-II
P2AA8

Engine Coolant Bypass Valve B Position Sensor Circuit Range/Performance

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Generic OBD-II
P2AA9

Engine Coolant Bypass Valve B Position Sensor Circuit Low

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Generic OBD-II
P2AAA

Engine Coolant Bypass Valve B Position Sensor Circuit High

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Generic OBD-II
P2AAB

Engine Coolant Bypass Valve B Position Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P2AAC

Diesel Fuel Presence Sensor Circuit

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Generic OBD-II
P2AAD

Diesel Fuel Presence Sensor Circuit Range/Performance

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Generic OBD-II
P2AAE

Diesel Fuel Presence Sensor Circuit Low

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Generic OBD-II
P2AAF

Diesel Fuel Presence Sensor Circuit High

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Generic OBD-II
P2AB0

Particulate Matter Sensor Processor Performance

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Generic OBD-II
P2AB1

Catalyst Heater Control Module Performance

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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.