Fault Family System: Powertrain (P-Codes) 8 SAE Codes

Engine Oil Pressure Control Valve Circuit

Diagnostic & Technical Explanation

Code P05E8 (Engine Oil Bypass Valve Control Circuit/Open) sets when the ECM detects an open circuit, out-of-range current, or a stuck-on/stuck-off performance fault while driving the variable oil pressure control (bypass) solenoid used to switch the oil pump between low- and high-pressure modes. Causes are a failed solenoid coil, sludge jamming the valve spool, or damaged control wiring between the ECM and the valve.

These 8 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 8 times.

Codes in this family (8)

Code	Definition	Repair coverage
P05E8	Engine Oil Bypass Valve Control Circuit/Open	4 ranked fixes
P05E9	Engine Oil Bypass Valve Control Circuit Low	4 ranked fixes
P05EA	Engine Oil Bypass Valve Control Circuit High	4 ranked fixes
P06DA	Engine Oil Pressure Control Circuit/Open	4 ranked fixes
P06DB	Engine Oil Pressure Control Circuit Low	4 ranked fixes
P06DC	Engine Oil Pressure Control Circuit High	4 ranked fixes
P06DD	Engine Oil Pressure Control Circuit Performance/Stuck Off	4 ranked fixes
P06DE	Engine Oil Pressure Control Circuit Stuck On	4 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