System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Battery Charger Thermal Management
Code P0E85: Battery Charger B Temperature Too High
Diagnostic & Technical Explanation
Code P0E85 sets when the onboard charger's internal thermal-management system — the sensor and derate logic protecting its power-conversion stage — reports a temperature or cooling-performance value outside the range expected for the present charge rate. The most common physical causes are a restricted or air-locked charger coolant passage on liquid-cooled chargers, or a clogged or failed charger cooling fan on air-cooled units, a degraded thermal-interface path between the charger's power devices and its heatsink, and a corroded temperature-sensor connector inside the charger housing. Because sustained high-rate AC charging drives this component hardest, the fault often first appears as a derated charge rate before escalating to a full charge-session shutdown.
First-listed procedure
Rank #1
Review scan-tool live data and inspect the accessible onboard charger thermal management connector
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 2 procedure(s) are in the licensed dataset. Ordering context.
Full family: Battery Charger Thermal Management
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)