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DTC codes / P06xx · Computer and output circuits / P06DE

P06DEEngine Oil Pressure Control Circuit Stuck On

P06DE indicates that the engine oil pressure control circuit is stuck in the 'on' state, meaning the powertrain control module (PCM) has commanded the oil pressure control solenoid to a specific duty cycle but the circuit feedback remains continuously energized. The PCM detects this by monitoring the solenoid driver circuit and seeing voltage or current that does not change when commanded, indicating a short to power or a failed solenoid stuck on.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaComputer and output circuits

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Low oil pressure warning light or message on the dashboard
  • Engine may enter limp mode or reduced power mode
  • Rough running or stalling, especially at idle
  • Poor fuel economy or increased oil consumption
  • Unusual engine noises such as ticking or knocking from the valvetrain

Common causes, most likely first

  1. Faulty oil pressure control solenoid stuck in the energized position
  2. Short to power in the oil pressure control circuit wiring
  3. Damaged or corroded electrical connector at the solenoid
  4. Failed PCM driver for the oil pressure control circuit
  5. Mechanical binding in the oil pump or pressure regulator causing the solenoid to remain engaged
  6. Contaminated engine oil or sludge blocking the solenoid valve

How to diagnose and fix it

  1. Verify the code with a scan tool and check for any related oil pressure codes
  2. Inspect the oil pressure control solenoid connector and wiring for signs of damage, corrosion, or short to power
  3. Measure resistance and voltage at the solenoid and compare to manufacturer specifications
  4. Perform a circuit test from the PCM to the solenoid to rule out a short to power
  5. Replace the oil pressure control solenoid if it is stuck on or out of specification
  6. Check oil condition and pressure with a mechanical gauge to rule out mechanical issues
  7. Clear the code and test-drive the vehicle to confirm the repair

Don't overlook the oil pressure control solenoid

  • A stuck-on oil pressure control solenoid can cause the oil pump to run at maximum pressure, leading to excessive oil pressure that may damage seals and gaskets over time.
  • Some vehicles use the oil pressure control solenoid to vary oil pressure for fuel economy and emissions, so a stuck-on solenoid may not trigger a low oil pressure warning immediately.
  • A short to power in the wiring harness can mimic a failed solenoid, so always check the circuit before replacing parts.
  • The PCM may set P06DE if the solenoid driver detects an unexpected voltage even when the solenoid is commanded off, which can be caused by a faulty PCM or a shorted wire.
  • Engine oil sludge or debris can cause the solenoid valve to stick, so regular oil changes are critical to prevent this code.

Can I keep driving with P06DE?

It is generally safe to drive with P06DE if the engine oil pressure warning light is not on and the engine runs smoothly, but avoid heavy loads and high speeds until the fault is repaired. If the oil pressure warning light illuminates or the engine makes unusual noises, stop driving and seek professional diagnosis immediately.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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