Fault Family System: Powertrain (P-Codes) 9 SAE Codes

Cvt Hydraulic Pump Circuit

Diagnostic & Technical Explanation

Code P0945 (Hydraulic Pump Relay/Control Circuit/Open) sets when the TCM detects an open circuit, out-of-range current, a stuck-on/stuck-off condition, or an over-temperature fault on the auxiliary electric hydraulic pump used to maintain CVT line pressure (often during stop-start idle). Causes are a worn/seized pump motor, a failed relay or driver circuit, or debris restricting pump flow.

These 9 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 9 times.

Codes in this family (9)

Code	Definition	Repair coverage
P0945	Hydraulic Pump Relay/Control Circuit/Open	3 ranked fixes
P0946	Hydraulic Pump Relay/Control Circuit Range/Performance	3 ranked fixes
P0947	Hydraulic Pump Relay/Control Circuit Low	3 ranked fixes
P0948	Hydraulic Pump Relay/Control Circuit High	3 ranked fixes
P094A	Hydraulic Pump Driver Performance	3 ranked fixes
P094B	Hydraulic Pump Stuck On	3 ranked fixes
P094C	Hydraulic Pump Performance/Stuck Off	3 ranked fixes
P094D	Hydraulic Pump Over Temperature	3 ranked fixes
P094E	Hydraulic Pump Supply Voltage Circuit/Open	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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