System: Powertrain (P-Code)
SAE Standard (Generic)
Family: HV Battery Pack Heater Performance
Code P2D38: Hybrid/EV Battery Pack Heater Performance
Diagnostic & Technical Explanation
Code P2D38 (Hybrid/EV Battery Pack Heater Performance) sets when the HV battery pack's internal heater is not raising pack temperature at the rate the battery management system expects in cold weather, hurting cold-weather range and charge acceptance. Causes are a partially failed heater element, a restricted coolant/heat-transfer path between the heater and the cells, or a control circuit fault limiting heater duty cycle.
First-listed procedure
Rank #1
Verify heater activation on a cold start
Professional Required
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: HV Battery Pack Heater Performance
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)