P CODE FAMILY

Powertrain code references — Page 27.

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

Generic OBD-II

P0AAF

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.

Very cold inlet-air data can be the battery sensor’s high-circuit fault

Hybrid/EV Battery Pack Air Temperature Sensor A Circuit Intermittent/Erratic

Hybrid/EV Battery Pack Air Temperature Sensor B Circuit

Outlet air is checked against the battery’s hottest module with the fan on

Battery outlet circuit low includes a cooler-module reference

The battery outlet sensor has an absolute cold-limit check

Hybrid/EV Battery Pack Air Temperature Sensor B Circuit Intermittent/Erratic

Active mount B open-circuit evidence belongs to the B control path

A low mount B circuit result needs its exact channel and failure type

Mount B circuit high is a controller-reported electrical category

This hybrid-performance entry describes a failed automatic engine transition

Hybrid/EV Battery Pack Voltage Sense A Circuit

Pack voltage must agree with the sum of its block measurements

Low pack-voltage sense is evaluated after the contactors close

A high pack-voltage signal has a circuit-specific monitor

Hybrid/EV Battery Pack Voltage Sense A Circuit Intermittent/Erratic

Hybrid/EV Battery Pack Current Sensor A Circuit

Battery-current plausibility uses offset, range agreement and voltage change

The battery-current circuit-low label corresponds to positive range limits here

Negative current-range limits identify the opposing battery-sensor extreme

Hybrid/EV Battery Pack Current Sensor A Circuit Intermittent/Erratic

The ECM is reporting a hybrid-controller request for the warning lamp

Hybrid/EV Battery Temperature Sensor B Circuit

Battery temperature input two must disagree with each of its peers

Battery input two is judged hot relative to at least one cooler channel

Battery input two has an independent extreme-cold circuit check

Sensor B's intermittent temperature signal

Hybrid/EV Battery Temperature Sensor C Circuit

Battery input three is tested as an outlier among four temperatures

Battery input three circuit low combines a hot value with a cooler peer

An absolute cold limit defines battery sensor-three circuit high

Battery temperature sensor C has an unstable signal

Hybrid/EV Battery Pack Cooling Fan 3 Control Circuit/Open

Hybrid/EV Battery Pack Cooling Fan 3 Performance/Stuck Off

Hybrid/EV Battery Pack Cooling Fan 3 Stuck On

Hybrid/EV Battery Pack Cooling Fan 3 Control Circuit Low

Hybrid/EV Battery Pack Cooling Fan 3 Control Circuit High

Wagoneer battery-airflow indication and BPCM software

Hybrid/EV Battery Pack Air Flow Valve A Control Circuit/Open

Hybrid/EV Battery Pack Air Flow Valve A Control Circuit Range/Performance

Hybrid/EV Battery Pack Air Flow Valve A Control Circuit Low

Hybrid/EV Battery Pack Air Flow Valve A Control Circuit High

positive-contactor driver response does not match the command

Hybrid/EV Battery Positive Contactor Control Circuit Range/Performance

Contactor control-low classification uses high feedback duty

Contactor control-high classification uses low feedback duty

negative-contactor control feedback fails its state comparison

Hybrid/EV Battery Negative Contactor Control Circuit Range/Performance

Negative contactor control is low during an on command

Negative contactor output stays high when commanded off

Hybrid/EV Battery Precharge Contactor Circuit

precharge path appears closed from the bus-to-battery ratio

Precharge bus voltage did not rise as expected

precharge driver feedback is inconsistent with its command

Hybrid/EV Battery Precharge Contactor A Control Circuit Range/Performance

Precharge contactor control is low while enabled

Precharge contactor driver reads high when off

Hybrid/EV Battery Temperature Sensor D Circuit

Battery temperature input four must differ from all three references

Battery input four circuit low requires a contrasting temperature pattern

Battery input four circuit high is an extreme-cold signal diagnosis

Temperature sensor D's changes exceed the stability test

Drive Motor Inverter Temperature Sensor A Circuit

Inverter-A temperature input zero is compared with the inverter average

Inverter-A sensor circuit low produces a hot indicated temperature

Inverter-A circuit high is a cold indication with a startup qualification

Drive Motor Inverter Temperature Sensor A Circuit Intermittent/Erratic

Drive Motor Inverter Temperature Sensor B Circuit

The generic B-temperature code maps to inverter-B sensor one in this document

Inverter-B input zero can fail electrically low while reading hot

Inverter-B sensor high is a cold-limit test with warmup context

Drive Motor Inverter Temperature Sensor B Circuit Intermittent/Erratic

The auxiliary power module reports excessive internal temperature

Battery and generator-controller voltage measurements disagree

Hybrid/EV Battery System Voltage Unstable

Hybrid output voltage falls below its monitored minimum

Battery voltage is compared with a safety limit rather than one fixed value

Hybrid/EV Battery Pack Sensor Module

Hybrid/EV Battery Pack Temperature Too Low

Hybrid/EV Battery System Voltage Too Low for Voltage Step Up Conversion