Fault Family System: Powertrain (P-Codes) 21 SAE Codes

CAC Coolant Pump Circuit

Diagnostic & Technical Explanation

Code P023A (Charge Air Cooler Coolant Pump A Control Circuit/Open) sets when the ECM detects an open circuit, out-of-range current, or a performance fault while driving the auxiliary coolant pump that circulates coolant through a liquid-cooled charge air cooler. Causes are a seized or worn pump motor, a blown fuse/relay, or damaged pump wiring.

These 21 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 21 times.

Codes in this family (21)

Code	Definition	Repair coverage
P023A	Charge Air Cooler Coolant Pump A Control Circuit/Open	3 ranked fixes
P023B	Charge Air Cooler Coolant Pump A Control Circuit Low	3 ranked fixes
P023C	Charge Air Cooler Coolant Pump A Control Circuit High	3 ranked fixes
P026E	Charge Air Cooler Coolant Pump A Performance	3 ranked fixes
P2B83	Charge Air Cooler Coolant Pump A Overspeed/Air In System	3 ranked fixes
P2B84	Charge Air Cooler Coolant Pump A Underspeed	3 ranked fixes
P2BC1	Charge Air Cooler Coolant Pump A Stuck/Stalled	3 ranked fixes
P2BC2	Charge Air Cooler Coolant Pump A Supply Voltage Circuit	3 ranked fixes
P2BC3	Charge Air Cooler Coolant Pump A Control Module Overtemperature	3 ranked fixes
P2CA1	Charge Air Cooler Coolant Pump Sense Circuit High	3 ranked fixes
P2CA2	Charge Air Cooler Coolant Pump Sense Circuit Low	3 ranked fixes
P2CA3	Charge Air Cooler Coolant Pump Sense Circuit Performance	3 ranked fixes
P2CAD	Charge Air Cooler Coolant Pump B Control Circuit/Open	3 ranked fixes
P2CAE	Charge Air Cooler Coolant Pump B Control Circuit Low	3 ranked fixes
P2CAF	Charge Air Cooler Coolant Pump B Control Circuit High	3 ranked fixes
P2CB0	Charge Air Cooler Coolant Pump B Performance	3 ranked fixes
P2CB1	Charge Air Cooler Coolant Pump B Overspeed/Air In System	3 ranked fixes
P2CB2	Charge Air Cooler Coolant Pump B Underspeed	3 ranked fixes
P2CB3	Charge Air Cooler Coolant Pump B Stuck/Stalled	3 ranked fixes
P2CB4	Charge Air Cooler Coolant Pump B Supply Voltage Circuit	3 ranked fixes
P2CB5	Charge Air Cooler Coolant Pump B 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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