Fault Family System: Powertrain (P-Codes) 88 SAE Codes

HV Battery Temperature Sensor

Diagnostic & Technical Explanation

Code P0A9B sets when the battery management system compares one cell-group thermistor in the pack's thermistor string against its neighboring cell-group readings and the coolant-inlet reference, and finds a value that disagrees by more than the allowed spread. Each thermistor is threaded through the module stack on a shared ribbon harness, so the most common causes are a connector pin at the module-level junction that backed out or corroded, a thermistor bead that delaminated from the cell-group busbar it monitors, and — because these readings feed the BMS's current-derating logic — a genuinely hot module whose cooling contact has degraded rather than a sensor fault at all. Cell-median plausibility checks are what distinguish a single bad sensor from real thermal spread across the pack.

These 88 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 88 times.

Codes in this family (88)

Code	Definition	Repair coverage
P0A9B	Hybrid/EV Battery Temperature Sensor A Circuit	4 ranked fixes
P0A9C	Hybrid/EV Battery Temperature Sensor A Circuit Range/Performance	4 ranked fixes
P0A9D	Hybrid/EV Battery Temperature Sensor A Circuit Low	4 ranked fixes
P0A9E	Hybrid/EV Battery Temperature Sensor A Circuit High	4 ranked fixes
P0A9F	Hybrid/EV Battery Temperature Sensor A Circuit Intermittent/Erratic	4 ranked fixes
P0AC5	Hybrid/EV Battery Temperature Sensor B Circuit	4 ranked fixes
P0AC6	Hybrid/EV Battery Temperature Sensor B Circuit Range/Performance	4 ranked fixes
P0AC7	Hybrid/EV Battery Temperature Sensor B Circuit Low	4 ranked fixes
P0AC8	Hybrid/EV Battery Temperature Sensor B Circuit High	4 ranked fixes
P0AC9	Hybrid/EV Battery Temperature Sensor B Circuit Intermittent/Erratic	4 ranked fixes
P0ACA	Hybrid/EV Battery Temperature Sensor C Circuit	4 ranked fixes
P0ACB	Hybrid/EV Battery Temperature Sensor C Circuit Range/Performance	4 ranked fixes
P0ACC	Hybrid/EV Battery Temperature Sensor C Circuit Low	4 ranked fixes
P0ACD	Hybrid/EV Battery Temperature Sensor C Circuit High	4 ranked fixes
P0ACE	Hybrid/EV Battery Temperature Sensor C Circuit Intermittent/Erratic	4 ranked fixes
P0AE8	Hybrid/EV Battery Temperature Sensor D Circuit	4 ranked fixes
P0AE9	Hybrid/EV Battery Temperature Sensor D Circuit Range/Performance	4 ranked fixes
P0AEA	Hybrid/EV Battery Temperature Sensor D Circuit Low	4 ranked fixes
P0AEB	Hybrid/EV Battery Temperature Sensor D Circuit High	4 ranked fixes
P0AEC	Hybrid/EV Battery Temperature Sensor D Circuit Intermittent/Erratic	4 ranked fixes
P0BC2	Hybrid/EV Battery Temperature Sensor E Circuit	4 ranked fixes
P0BC3	Hybrid/EV Battery Temperature Sensor E Circuit Range/Performance	4 ranked fixes
P0BC4	Hybrid/EV Battery Temperature Sensor E Circuit Low	4 ranked fixes
P0BC5	Hybrid/EV Battery Temperature Sensor E Circuit High	4 ranked fixes
P0BC6	Hybrid/EV Battery Temperature Sensor E Circuit Intermittent/Erratic	4 ranked fixes
P0C33	Hybrid/EV Battery Temperature Sensor F Circuit	4 ranked fixes
P0C34	Hybrid/EV Battery Temperature Sensor F Circuit Range/Performance	4 ranked fixes
P0C35	Hybrid/EV Battery Temperature Sensor F Circuit Low	4 ranked fixes
P0C36	Hybrid/EV Battery Temperature Sensor F Circuit High	4 ranked fixes
P0C37	Hybrid/EV Battery Temperature Sensor F Circuit Intermittent/Erratic	4 ranked fixes
P0C6E	Hybrid/EV Battery Temperature Sensor A/B Correlation	4 ranked fixes
P0C6F	Hybrid/EV Battery Temperature Sensor B/C Correlation	4 ranked fixes
P0C70	Hybrid/EV Battery Temperature Sensor C/D Correlation	4 ranked fixes
P0C71	Hybrid/EV Battery Temperature Sensor D/E Correlation	4 ranked fixes
P0C72	Hybrid/EV Battery Temperature Sensor E/F Correlation	4 ranked fixes
P0C7C	Hybrid/EV Battery Temperature Sensor G Circuit	4 ranked fixes
P0C7D	Hybrid/EV Battery Temperature Sensor G Circuit Range/Performance	4 ranked fixes
P0C7E	Hybrid/EV Battery Temperature Sensor G Circuit Low	4 ranked fixes
P0C7F	Hybrid/EV Battery Temperature Sensor G Circuit High	4 ranked fixes
P0C80	Hybrid/EV Battery Temperature Sensor G Circuit Intermittent/Erratic	4 ranked fixes
P0C81	Hybrid/EV Battery Temperature Sensor H Circuit	4 ranked fixes
P0C82	Hybrid/EV Battery Temperature Sensor H Circuit Range/Performance	4 ranked fixes
P0C83	Hybrid/EV Battery Temperature Sensor H Circuit Low	4 ranked fixes
P0C84	Hybrid/EV Battery Temperature Sensor H Circuit High	4 ranked fixes
P0C85	Hybrid/EV Battery Temperature Sensor H Circuit Intermittent/Erratic	4 ranked fixes
P0C86	Hybrid/EV Battery Temperature Sensor F/G Correlation	4 ranked fixes
P0C87	Hybrid/EV Battery Temperature Sensor G/H Correlation	4 ranked fixes
P0C88	Hybrid/EV Battery Temperature Sensor I Circuit	4 ranked fixes
P0C89	Hybrid/EV Battery Temperature Sensor I Range/Performance	4 ranked fixes
P0C8A	Hybrid/EV Battery Temperature Sensor I Circuit Low	4 ranked fixes
P0C8B	Hybrid/EV Battery Temperature Sensor I Circuit High	4 ranked fixes
P0C8C	Hybrid/EV Battery Temperature Sensor I Circuit Intermittent/Erratic	4 ranked fixes
P0C8D	Hybrid/EV Battery Temperature Sensor J Circuit	4 ranked fixes
P0C8E	Hybrid/EV Battery Temperature Sensor J Range/Performance	4 ranked fixes
P0C8F	Hybrid/EV Battery Temperature Sensor J Circuit Low	4 ranked fixes
P0C90	Hybrid/EV Battery Temperature Sensor J Circuit High	4 ranked fixes
P0C91	Hybrid/EV Battery Temperature Sensor J Circuit Intermittent/Erratic	4 ranked fixes
P0C92	Hybrid/EV Battery Temperature Sensor K Circuit	4 ranked fixes
P0C93	Hybrid/EV Battery Temperature Sensor K Range/Performance	4 ranked fixes
P0C94	Hybrid/EV Battery Temperature Sensor K Circuit Low	4 ranked fixes
P0C95	Hybrid/EV Battery Temperature Sensor K Circuit High	4 ranked fixes
P0C96	Hybrid/EV Battery Temperature Sensor K Circuit Intermittent/Erratic	4 ranked fixes
P0C97	Hybrid/EV Battery Temperature Sensor L Circuit	4 ranked fixes
P0C98	Hybrid/EV Battery Temperature Sensor L Range/Performance	4 ranked fixes
P0C99	Hybrid/EV Battery Temperature Sensor L Circuit Low	4 ranked fixes
P0C9A	Hybrid/EV Battery Temperature Sensor L Circuit High	4 ranked fixes
P0C9B	Hybrid/EV Battery Temperature Sensor L Circuit Intermittent/Erratic	4 ranked fixes
P0CA8	Hybrid/EV Battery Temperature Sensor M Circuit	4 ranked fixes
P0CA9	Hybrid/EV Battery Temperature Sensor M Circuit Range/Performance	4 ranked fixes
P0CAA	Hybrid/EV Battery Temperature Sensor M Circuit Low	4 ranked fixes
P0CAB	Hybrid/EV Battery Temperature Sensor M Circuit High	4 ranked fixes
P0CAC	Hybrid/EV Battery Temperature Sensor M Circuit Intermittent/Erratic	4 ranked fixes
P0CAD	Hybrid/EV Battery Temperature Sensor N Circuit	4 ranked fixes
P0CAE	Hybrid/EV Battery Temperature Sensor N Circuit Range/Performance	4 ranked fixes
P0CAF	Hybrid/EV Battery Temperature Sensor N Circuit Low	4 ranked fixes
P0CB0	Hybrid/EV Battery Temperature Sensor N Circuit High	4 ranked fixes
P0CB1	Hybrid/EV Battery Temperature Sensor N Circuit Intermittent/Erratic	4 ranked fixes
P0CB2	Hybrid/EV Battery Temperature Sensor O Circuit	4 ranked fixes
P0CB3	Hybrid/EV Battery Temperature Sensor O Circuit Range/Performance	4 ranked fixes
P0CB4	Hybrid/EV Battery Temperature Sensor O Circuit Low	4 ranked fixes
P0CB5	Hybrid/EV Battery Temperature Sensor O Circuit High	4 ranked fixes
P0CB6	Hybrid/EV Battery Temperature Sensor O Circuit Intermittent/Erratic	4 ranked fixes
P0CB7	Hybrid/EV Battery Temperature Sensor P Circuit	4 ranked fixes
P0CB8	Hybrid/EV Battery Temperature Sensor P Circuit Range/Performance	4 ranked fixes
P0CB9	Hybrid/EV Battery Temperature Sensor P Circuit Low	4 ranked fixes
P0CBA	Hybrid/EV Battery Temperature Sensor P Circuit High	4 ranked fixes
P0CBB	Hybrid/EV Battery Temperature Sensor P Circuit Intermittent/Erratic	4 ranked fixes
P0ECA	Hybrid/EV Battery Temperature Sensor System - Multiple Sensor Correlation	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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