Fault Family System: Powertrain (P-Codes) 4 SAE Codes

Cvt Hydraulic Pressure Unit Performance

Diagnostic & Technical Explanation

Code P0942 (Hydraulic Pressure Unit) sets when the TCM's hydraulic pressure unit (pump plus accumulator system) cycles more often, or loses pressure faster, than expected, indicating a system-level hydraulic performance problem rather than a single sensor or solenoid fault. Causes are internal seal wear allowing pressure bleed-down, a worn pump, or contaminated fluid affecting seal sealing.

These 4 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 4 times.

Codes in this family (4)

Code	Definition	Repair coverage
P0942	Hydraulic Pressure Unit	3 ranked fixes
P0943	Hydraulic Pressure Unit Cycling Period Too Short	3 ranked fixes
P0944	Hydraulic Pressure Unit Loss of Pressure	3 ranked fixes
P2712	Hydraulic Power Unit Leakage	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)

Need All 15,886 Codes as Data?

Pipe-delimited CSV, Apache Parquet and a relational SQLite database, with commercial application rights and instant download. Built for scan tools, shop software and research - not assembled one web page at a time.

License OEM Complete · $149 Standard (SAE only) · $49

$49 Standard: 9,249 SAE codes · $149 OEM Complete: all 15,886 codes, including 6,637 OEM codes across 32 makes · $149 Heavy Duty: 4,212 fault pairs (J1939) · one-time · compare tiers