P CODE FAMILY

Powertrain code references — Page 16.

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

Generic OBD-II

P05E0

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.

GM brake-pedal channels disagree

A/C Refrigerant Pressure Sensor A Circuit Intermittent/Erratic

A/C Refrigerant Pressure Sensor B Circuit Intermittent/Erratic

Park Brake Sensor/Switch Circuit

Park Brake Sensor/Switch Circuit Low

Park Brake Sensor/Switch Circuit High

Park Brake Sensor/Switch Circuit Range/Performance

Park Brake Sensor/Switch Circuit Intermittent/Erratic

Engine Oil Bypass Valve Control Circuit/Open

Engine Oil Bypass Valve Control Circuit Low

Engine Oil Bypass Valve Control Circuit High

Cold Start SCR NOx Catalyst Inlet Temperature Too Low

cold-start injection request and scheduling disagree

Reductant Heater Control Module Supply Voltage

Reductant Pump Supply Voltage Circuit/Open

Reductant Pump Supply Voltage Circuit Low

Reductant Pump Supply Voltage Circuit High

Reductant Pump Supply Voltage Circuit Stuck On

Reductant Pump Supply Voltage Circuit Stuck Off

Exhaust Aftertreatment Power Relay Control Circuit/Open

Exhaust Aftertreatment Power Relay Control Circuit Low

Exhaust Aftertreatment Power Relay Control Circuit High

Exhaust Aftertreatment Power Relay Control Circuit Stuck On

Exhaust Aftertreatment Power Relay Control Circuit Stuck Off

Reductant Heater Control Module Performance

Stop-Start Status Signal Circuit

Stop-Start Status Signal Circuit Low

Stop-Start Status Signal Circuit High

Cold Start Fuel Pressure Performance Bank 2

VGT drive electronics report excessive temperature

Active Grille Air Shutter C Performance/Stuck Off

Brake pressure and pedal information disagree in stop-start supervision

Internal transmission-controller serial communication faults

checksum and flash-memory integrity failures

programming status depends on which module reports it

nonvolatile-memory checks occur at both startup and shutdown

RAM integrity checks cover several different memory paths

A TCM flash-memory read error is different from a checksum complaint

processor-integrity faults require the reporting module

built-in self-tests and memory error counters

Control Module VSS Output A

Vehicle-speed output channel feedback disagrees with its command

Processor-performance codes need the reporting module identified

internal analog-conversion checks are not external sensor thresholds

redundant calculations reveal processor-performance problems

Pedal plausibility includes signal scaling and learned values

Throttle-angle monitoring inside the DME

Internal Control Module Coolant Temperature Performance

A TCM recovery reset differs from the generic vehicle-options label

This diesel injector-module fault monitors an internal voltage quantity

Fuel Injector Control Module Relay Control

TCM processor diagnosis can identify an operating-system startup fault

ECM/TCM Incompatible

starter relay open-circuit checking occurs with the driver off

starter relay low voltage is judged in the off state

starter relay high voltage during an on command

Alternative Fuel Control Module KAM Error

Alternative Fuel Control Module RAM/ROM Error

Torque supervision can fail without a check-engine light

One torque-calculation code can describe different supervised events

internal engine-speed calculation versus measured speed

Internal airmass supervision is different from a MAF sensor circuit code

Internal Control Module Brake Signal Performance

Throttle-controller supervision is a different layer from motor wiring

Alternator output monitoring and occurrence history

generator L-terminal integrity is a circuit check

generator field-feedback duty cycle needs operating context

Generator Lamp Control Circuit

Fuel Cap Lamp Control Circuit

A low generator F-terminal duty cycle is checked with the engine running

The high F-terminal test belongs to a stationary key-on starting state

feed-fuel-pump relay driver detects an open load

fuel-pump relay control short-to-ground signature

fuel-pump relay output stays high while commanded off

Lift-pump feedback leaves its narrow duty-cycle window

fuel-injector driver integrity has several internal failure paths

Vehicle-speed supervision is not simply a missing speed-sensor signal

injector-driver boost voltage outside its operating window

Bank-two injector-driver performance concerns the high-voltage supply

EEPROM performance is module specific