Fault Family System: Powertrain (P-Codes) 29 SAE Codes

Motor Electronics Coolant Pump

Diagnostic & Technical Explanation

Code P0A05 sets when the control module commands the motor electronics coolant pump to a duty cycle and does not see the matching current draw or tachometer feedback pulse the pump's internal driver reports back, or the coolant-loop temperature fails to fall after the command. Because this pump runs whenever the inverter or DC/DC converter is hot regardless of vehicle speed, the most common physical causes are impeller wear or cavitation from long service intervals, a corroded low-current PWM signal connector, and a pump driver IC that has failed inside the pump housing itself.

These 29 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 29 times.

Codes in this family (29)

Code	Definition	Repair coverage
P0A05	Motor Electronics Coolant Pump A Control Circuit/Open	3 ranked fixes
P0A06	Motor Electronics Coolant Pump A Control Circuit Low	3 ranked fixes
P0A07	Motor Electronics Coolant Pump A Control Circuit High	3 ranked fixes
P0B38	Motor Electronics Coolant Pump B Control Circuit/Open	3 ranked fixes
P0B39	Motor Electronics Coolant Pump B Control Circuit Low	3 ranked fixes
P0B3A	Motor Electronics Coolant Pump B Control Circuit High	3 ranked fixes
P0C73	Motor Electronics Coolant Pump A Control Performance	3 ranked fixes
P0C74	Motor Electronics Coolant Pump B Control Performance	3 ranked fixes
P0E4F	Motor Electronics Coolant Pump A Control Circuit Intermittent/Erratic	3 ranked fixes
P0E50	Motor Electronics Coolant Pump B Control Circuit Intermittent/Erratic	3 ranked fixes
P2BD4	Motor Electronics Coolant Pump C Control Circuit/Open	3 ranked fixes
P2BD5	Motor Electronics Coolant Pump C Control Circuit Low	3 ranked fixes
P2BD6	Motor Electronics Coolant Pump C Control Circuit High	3 ranked fixes
P2BD7	Motor Electronics Coolant Pump C Control Performance	3 ranked fixes
P2D00	Motor Electronics Coolant Pump A Stuck/Stalled	3 ranked fixes
P2D01	Motor Electronics Coolant Pump A Overspeed/Air in System	3 ranked fixes
P2D02	Motor Electronics Coolant Pump A Underspeed	3 ranked fixes
P2D03	Motor Electronics Coolant Pump A Supply Voltage Circuit	3 ranked fixes
P2D04	Motor Electronics Coolant Pump A Control Module Overtemperature	3 ranked fixes
P2D05	Motor Electronics Coolant Pump B Stuck/Stalled	3 ranked fixes
P2D06	Motor Electronics Coolant Pump B Overspeed/Air in System	3 ranked fixes
P2D07	Motor Electronics Coolant Pump B Underspeed	3 ranked fixes
P2D08	Motor Electronics Coolant Pump B Supply Voltage Circuit	3 ranked fixes
P2D09	Motor Electronics Coolant Pump B Control Module Overtemperature	3 ranked fixes
P2D0A	Motor Electronics Coolant Pump C Stuck/Stalled	3 ranked fixes
P2D0B	Motor Electronics Coolant Pump C Overspeed/Air in System	3 ranked fixes
P2D0C	Motor Electronics Coolant Pump C Underspeed	3 ranked fixes
P2D0D	Motor Electronics Coolant Pump C Supply Voltage Circuit	3 ranked fixes
P2D0E	Motor Electronics Coolant Pump C Control Module Overtemperature	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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