P CODE FAMILY

Powertrain code references — Page 18.

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

Generic OBD-II

P06A8

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.

Sensor reference C needs its own circuit identification

Sensor Reference Voltage D Circuit Range/Performance

Control Module Internal Temperature B Too High

Control Module Internal Temperature Sensor B Circuit

Powerup temperature plausibility depends on two independent differences

A low powerup-temperature signal has load and speed prerequisites

An extreme powerup-temperature reading is a circuit diagnosis

engine shutdown code can reflect controller pattern monitoring

Sensor Power Supply A Circuit/Open

speed-sensor supply switch current or temperature fault

Motor A sensor power is a 15-volt rail in this implementation

Sensor Power Supply B Circuit/Open

Sensor supply B low may originate from a protective switch report

Motor B has a separate high sensor-supply diagnosis

the knock-monitor test circuit has its own diagnostic

The knock-processor test is not a measurement of engine knock

NVRAM monitoring differs from processor resets and missing solenoid data

Cylinder1 glow resistance is checked after basic electrical faults

Cylinder2 performance can fail after an open-circuit check passes

Cylinder3 resistance monitoring begins after the basic fault checks

A cylinder4 glow performance fault is not just an open-circuit result

Cylinder5 glow resistance requires more evidence than continuity

Cylinder6 performance monitoring follows the open and short checks

The cylinder7 resistance check is explicitly limited to the V8 example

Cylinder8 glow performance needs the operating resistance test

Cylinder 9 Glow Plug Circuit Range/Performance

Cylinder 10 Glow Plug Circuit Range/Performance

Cylinder 11 Glow Plug Circuit Range/Performance

Cylinder 12 Glow Plug Circuit Range/Performance

cylinder 1 glow-plug resistance rationality

why cylinder 2 can fail the glow-plug rationality test

cylinder 3 glow-plug performance judged by resistance

cylinder 4 glow-plug incorrect versus an electrical short

cylinder 5 glow-plug rationality with a source-label caveat

cylinder 6 glow-plug rationality and inconsistent source wording

An incorrect-glow-plug code can be a live resistance-rationality result

Cylinder 8 glow-plug rationality depends on both voltage and current feedback

Cylinder 9 Glow Plug Incorrect

Cylinder 10 Glow Plug Incorrect

Cylinder 11 Glow Plug Incorrect

Cylinder 12 Glow Plug Incorrect

Ignition-control performance can be an internal SPI communication error

the fifth sensor reference is monitored for low supply voltage

Reference E low identifies the VSS2 speed-sensor supply

Reference E high uses the VSS2 rail’s own voltage scale

Reference E uses an internal bandgap check, not the external five-volt limits

Sensor Reference Voltage F Circuit/Open

Sensor Reference Voltage F Circuit Low

Sensor Reference Voltage F Circuit High

Sensor Reference Voltage F Circuit Range/Performance

oil-pressure control open circuit is an electrical monitor

oil-pump control voltage is low in the off state

oil-pump control circuit stays high when driven on

two-stage oil-pump response remains in the high-pressure state

a two-stage oil pump fails to leave its low-pressure state

Ford glow-plug module memory checksum fault

Cylinder 11 Glow Plug Control Circuit Low

Cylinder 11 Glow Plug Control Circuit High

Cylinder 12 Glow Plug Control Circuit Low

Cylinder 12 Glow Plug Control Circuit High

Pacifica wake-up performance and permanent-code clearing

glow-control performance can be judged by calculated ground offset

Sensor Power Supply C Circuit/Open

the auxiliary-pump controller sees its 15-volt sensor supply low

sensor supply C is above the ATPC limit

Compass starter performance and market-specific PCM logic

Ford upstream NOx sensor processor performance fault

Ford downstream NOx sensor processor performance fault

Fuel Injector Control Module Requested MIL Illumination

Engine RPM Output Circuit Low

Engine RPM Output Circuit High

Wrangler restart performance and coordinated PCM/ABS software

Reductant Control Module Internal Temperature Sensor Circuit

Reductant Control Module Internal Temperature Sensor Range/Performance

Reductant Control Module Internal Temperature Sensor Circuit Low

Reductant Control Module Internal Temperature Sensor Circuit High

Stop-Start Mode Lamp Control Circuit

Glow Plug Control Module 2

Glow Plug Control Module 2 Control Circuit/Open

Glow Plug Control Module 2 Control Circuit Low