Fault Family System: Powertrain (P-Codes) 26 SAE Codes

HV Battery Pack Coolant Pump

Diagnostic & Technical Explanation

Code P0C32 sets when the control module commands the HV battery pack's dedicated coolant pump on or off and does not see the matching current draw, tachometer feedback, or pack-temperature response within the diagnostic window. The most common physical causes are a blown fuse or failed relay feeding this pump specifically, separate from the drive-motor or power-electronics pumps, impeller wear or cavitation from age, and a corroded low-current connector at the pump. Because the pack has its own coolant loop on most liquid-cooled platforms, this fault should not be diagnosed by servicing the drive-motor or power-electronics cooling pumps.

These 26 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 26 times.

Codes in this family (26)

Code	Definition	Repair coverage
P0C32	Hybrid/EV Battery Cooling System A Performance	3 ranked fixes
P0C47	Hybrid/EV Battery Pack Coolant Pump A Control Circuit/Open	3 ranked fixes
P0C48	Hybrid/EV Battery Pack Coolant Pump A Control Circuit Low	3 ranked fixes
P0C49	Hybrid/EV Battery Pack Coolant Pump A Control Circuit High	3 ranked fixes
P0C4A	Hybrid/EV Battery Pack Coolant Pump A Control Performance	3 ranked fixes
P0C4B	Hybrid/EV Battery Pack Coolant Pump A Supply Voltage Circuit/Open	3 ranked fixes
P0C4C	Hybrid/EV Battery Pack Coolant Pump A Supply Voltage Circuit Low	3 ranked fixes
P0C4D	Hybrid/EV Battery Pack Coolant Pump A Supply Voltage Circuit High	3 ranked fixes
P0CFF	Hybrid/EV Battery Pack Coolant Pump A Stuck/Stalled	3 ranked fixes
P0E1A	Hybrid/EV Battery Pack Coolant Pump B Control Circuit/Open	3 ranked fixes
P0E1B	Hybrid/EV Battery Pack Coolant Pump B Control Circuit Low	3 ranked fixes
P0E1C	Hybrid/EV Battery Pack Coolant Pump B Control Circuit High	3 ranked fixes
P0E1D	Hybrid/EV Battery Pack Coolant Pump B Control Performance	3 ranked fixes
P0E1E	Hybrid/EV Battery Pack Coolant Pump B Control Circuit Driver Current/Temperature Too High	3 ranked fixes
P0E1F	Hybrid/EV Battery Pack Coolant Pump A Control Circuit Driver Current/Temperature Too High	3 ranked fixes
P0E3B	Hybrid/EV Battery Coolant Pump Overspeed	3 ranked fixes
P0E3C	Hybrid/EV Battery Coolant Pump Underspeed	3 ranked fixes
P2B28	Hybrid/EV Battery Pack Coolant Pump A Performance	3 ranked fixes
P2B29	Hybrid/EV Battery Pack Coolant Pump A Overspeed - Dry Run	3 ranked fixes
P2CF3	Hybrid/EV Battery Pack Coolant Pump A Underspeed	3 ranked fixes
P2CF4	Hybrid/EV Battery Pack Coolant Pump B Supply Voltage Circuit	3 ranked fixes
P2CF5	Hybrid/EV Battery Pack Coolant Pump B Stuck/Stalled	3 ranked fixes
P2CF6	Hybrid/EV Battery Pack Coolant Pump B Overspeed /Air in System	3 ranked fixes
P2CF7	Hybrid/EV Battery Pack Coolant Pump B Underspeed	3 ranked fixes
P2D3F	Hybrid/EV Battery Cooling System B Performance	3 ranked fixes
P2D40	Hybrid/EV Battery Cooling System C Performance	3 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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