Fault Family System: Powertrain (P-Codes) 10 SAE Codes

HV Battery Pack Air Temp Sensor

Diagnostic & Technical Explanation

Code P0AAC sets when the control module detects an implausible reading from the sensor measuring cooling-air temperature entering the HV battery pack's air-cooled duct — the value disagrees with cabin/ambient temperature or the blower's commanded speed. Because this sensor sits in open airflow rather than potted against a cell or coolant line, its most common failure modes are dust or debris coating the sensing element inside the duct, a loose or disconnected duct segment letting unconditioned air bypass the sensor, and a corroded connector at the duct-mounted housing. A clogged cabin-air or pack-inlet filter restricting blower flow can also produce a plausible-looking but incorrect reading without any sensor fault.

These 10 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 10 times.

Codes in this family (10)

Code	Definition	Repair coverage
P0AAC	Hybrid/EV Battery Pack Air Temperature Sensor A Circuit	4 ranked fixes
P0AAD	Hybrid/EV Battery Pack Air Temperature Sensor A Circuit Range/Performance	4 ranked fixes
P0AAE	Hybrid/EV Battery Pack Air Temperature Sensor A Circuit Low	4 ranked fixes
P0AAF	Hybrid/EV Battery Pack Air Temperature Sensor A Circuit High	4 ranked fixes
P0AB0	Hybrid/EV Battery Pack Air Temperature Sensor A Circuit Intermittent/Erratic	4 ranked fixes
P0AB1	Hybrid/EV Battery Pack Air Temperature Sensor B Circuit	4 ranked fixes
P0AB2	Hybrid/EV Battery Pack Air Temperature Sensor B Circuit Range/Performance	4 ranked fixes
P0AB3	Hybrid/EV Battery Pack Air Temperature Sensor B Circuit Low	4 ranked fixes
P0AB4	Hybrid/EV Battery Pack Air Temperature Sensor B Circuit High	4 ranked fixes
P0AB5	Hybrid/EV Battery Pack Air Temperature Sensor B Circuit Intermittent/Erratic	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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