Fault Family System: Powertrain (P-Codes) 22 SAE Codes

Battery Charger Coupler Temp Sensor

Diagnostic & Technical Explanation

Code P0D99 (Battery Charger Coupler Temperature Sensor A Circuit) sets when the charging control module detects a fault in the charge-inlet coupler's temperature-sensing circuit, or an actual overheating condition at the coupler during an AC or DC charge session. Circuit-fault codes point to an open, shorted, or out-of-range thermistor signal from the coupler's temperature sensor, while a Temperature Too High condition code indicates the coupler pins are genuinely overheating — almost always from corroded, loose, or high-resistance pin contacts, or debris in the charge inlet preventing full mating. Because sustained high resistance at the pins can damage the connector, the module derates or aborts the charge session as a protective measure until the fault clears; this circuit is diagnosed and serviced on the low-voltage sensor side without exposing the HV bus.

These 22 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 22 times.

Codes in this family (22)

Code	Definition	Repair coverage
P0D99	Battery Charger Coupler Temperature Sensor A Circuit	4 ranked fixes
P0D9A	Battery Charger Coupler Temperature Sensor A Circuit Range/Performance	4 ranked fixes
P0D9B	Battery Charger Coupler Temperature Sensor A Circuit Low	4 ranked fixes
P0D9C	Battery Charger Coupler Temperature Sensor A Circuit High	4 ranked fixes
P0D9D	Battery Charger Coupler Temperature Sensor A Circuit Intermittent/Erratic	4 ranked fixes
P0E5F	Battery Charger Coupler Temperature A Too High	4 ranked fixes
P0EE7	Battery Charger Coupler Temperature Sensor B Circuit	4 ranked fixes
P0EE8	Battery Charger Coupler Temperature Sensor B Circuit Range/Performance	4 ranked fixes
P0EE9	Battery Charger Coupler Temperature Sensor B Circuit Low	4 ranked fixes
P0EEA	Battery Charger Coupler Temperature Sensor B Circuit High	4 ranked fixes
P0EEB	Battery Charger Coupler Temperature Sensor B Circuit Intermittent/Erratic	4 ranked fixes
P0EEE	Battery Charger Coupler Temperature B Too High	4 ranked fixes
P2E4A	Battery Charger Coupler Temperature Sensor C Circuit	4 ranked fixes
P2E4B	Battery Charger Coupler Temperature Sensor C Circuit Range/Performance	4 ranked fixes
P2E4C	Battery Charger Coupler Temperature Sensor C Circuit Low	4 ranked fixes
P2E4D	Battery Charger Coupler Temperature Sensor C Circuit High	4 ranked fixes
P2E4E	Battery Charger Coupler Temperature C Too High	4 ranked fixes
P2E4F	Battery Charger Coupler Temperature Sensor D Circuit	4 ranked fixes
P2E50	Battery Charger Coupler Temperature Sensor D Circuit Range/Performance	4 ranked fixes
P2E51	Battery Charger Coupler Temperature Sensor D Circuit Low	4 ranked fixes
P2E52	Battery Charger Coupler Temperature Sensor D Circuit High	4 ranked fixes
P2E53	Battery Charger Coupler Temperature D Too High	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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