DOCUMENTED DIAGNOSTIC CONTEXT

Diagnostic code articles — Page 32.

Understand what the recorded fault means, which findings change the diagnosis, and what the cited documentation can confirm. Each article states the system or vehicle scope it covers.

Some sources leave details unresolved. Those articles include a visible source note; a code match alone does not establish applicability to your vehicle.

DPF regeneration starts too often relative to modeled soot

The cooler-bypass open check requires an off driver but a non-closed request

EGR bypass performance is checked through temperature response

EGR cooler bypass circuit low and H-bridge overcurrent

EGR cooler bypass circuit high under motor command

Digital pressure sensor B circuit status differs from an analog voltage fault

Pressure-sensor B performance is assessed after electrical checks

Low pressure-sensor B voltage does not directly prove low filter pressure

High pressure-sensor B voltage is not a filter-restriction measurement

Intermittent pressure-sensor B faults need a time record, not one good reading

DPF soot estimate reaches the service-regeneration range

coolant-loss diagnosis in Ford’s 2.0L EcoBoost EGR-cooler case

DPF restriction reaches the forced-power-limitation threshold

Ford DPF pressure sensors disagree under exhaust flow

identify exhaust-temperature sensor 4 before trusting its display label

Exhaust sensor 4 fails to warm plausibly after a soak

Exhaust temperature sensor 4 below its valid input range

High-range exhaust temperature sensor 4 input

EGT sensor 4 intermittent signal and rapid-change monitoring

Ford exhaust-temperature sensor 1 exceeds engineering range

Ford exhaust-temperature sensor 2 high engineering-range fault

Ford exhaust-temperature sensor 3 exceeds its upper range

Ford exhaust-temperature sensor 4 upper-range fault

EGT sensor 5 circuit low across analog and digital systems

EGT sensor 5 circuit high and architecture-specific thresholds

EGT sensor 5 response plausibility after an engine-off soak

EGT sensor 5 intermittent signal and temperature-step evidence

Reductant heater A supply low in the GM tank-heater monitor

Reductant heater A supply high relative to the powertrain relay

Reductant heater B supply low in the GM line-heater monitor

A DEF heater sense-high result is a voltage comparison

EGR bypass tracking depends on completed offset learning

Low EGR bypass feedback is different from a closed valve

High bypass-sensor voltage does not establish full opening

reductant pressure takes too long to enter closed-loop control

closed-loop reductant estimate indicates insufficient dosing

closed-loop reductant estimate indicates excessive dosing

DPF regeneration spends too little time in closed-loop control

DPF regeneration temperature remains below its target

DPF regeneration temperature exceeds its target

Incomplete DPF regeneration is judged by soot remaining afterward

DPF loading reaches the severe restriction threshold

The EGR bypass fails to return after drive is removed

Particulate-sensor current stays too high after sensor regeneration

particulate sensor state feedback disagrees with its command

particulate sensor electrode response is too small

particulate sensor electrode signal shorted to power

The particulate-sensor heater is checked while regeneration heating is on

Unexpected heater voltage appears while the particulate sensor is measuring

particulate sensor heater reports a ground-short condition

particulate sensor heater remains electrically active when off

Particulate-sensor heater resistance changes with temperature

EVAP pressure correlation compares the vented system with ambient pressure

Leak-detection pressure sensor voltage is below its electrical range

Leak-detection pressure sensor voltage exceeds its upper boundary

Super Duty exhaust-temperature faults and the PCM software case

An EGR bypass learning limit is not the normal travel limit

Particulate-sensor temperature circuit faults use electrical limits

particulate sensor temperature disagrees with its model

particulate sensor temperature circuit reports an electrical fault

Particulate-sensor supply voltage is judged by voltage drop under heater demand

particulate sensor regeneration does not achieve its thermal goal

the EVAP pressure-sensor number may be misleading

particulate sensor heater response suggests an exhaust-sample problem

Control-module wake-up output is open in its off state

Wake-up output voltage is low during an on command

Wake-up circuit remains high with the command off

An incorrect SCR catalyst code uses cumulative conversion evidence

Charging-system voltage fault with several hybrid battery triggers

Low voltage at a Mazda M Hybrid charging-system node

High voltage across the hybrid charging network

Interrupted permanent ECM supply affects engine-off timing

Mazda transport-mode starts can leave a low-voltage history code

Ford internal ECU five-volt supply is too high

Oil-level sensor errors can also result from excessive oil

Hyundai oil-level circuit-low warning and ROM matching

Venue oil-level warning: the dipstick decides the branch

ECM relay faults can mean power ends too late or too early

Low-side refrigerant pressure must respond after compressor start

Low-side refrigerant sensor voltage is below its valid range