P1689

Code

Other P — Powertrain

Oil Pressure Control Solenoid Circuit Malfunction

Brand: Other

Type: P — Powertrain

Views: UK: 35 EN: 77 RU: 45

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Page language: EN

Causes

Open or shorted wiring to the oil pressure control solenoid
Corroded, loose or damaged connector pins
Failed oil pressure control solenoid (coil or valve stuck)
Poor ground or low battery/system voltage
Clogged oil passages or contaminated oil preventing valve movement
Faulty PCM/ECM driver output or internal electronics

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Oil pressure warning lamp or message
Engine limp or reduced performance (if oil pressure control affects timing/vanes)
Rough idle or hesitation
Possible abnormal oil pressure readings
Intermittent starts or stalls in severe cases

What to check

Retrieve freeze-frame and live-data with a scan tool; confirm code and any related codes (oil pressure/supply voltage)
Verify battery voltage and charging system health (engine running and cranking)
Inspect connector at the solenoid for corrosion, bent pins, moisture, and secure mating
Visually inspect wiring along harness for damage, chafing, pinches, or rodent damage
Check fuses/relays for the solenoid circuit
Check oil level and condition; inspect for clogged oil passages if service history indicates contamination

Signal parameters

Power supply voltage at harness connector: ~12 V (engine off) and ~13.5–14.5 V (engine running)
Solenoid coil resistance (typical): approximately 5–50 Ω (vehicle-specific; consult service data)
Control signal: PWM duty cycle 0–100% (varies with engine load and command)
Driver output switching frequency: often in the tens to a few hundred Hz (vehicle-specific)
Expected behavior: continuity present through coil (unless commanded open); driver switches voltage to modulate duty cycle; no sustained short to ground or battery

Diagnostic algorithm

Read and record all stored codes, freeze-frame data and pending codes. Check for related oil-pressure or voltage codes.
Confirm oil level and condition. Low oil can cause pressure-related faults—top up if low and re-check.
Visually inspect the solenoid connector and harness for damage, corrosion, or poor contacts. Repair as needed.
With connector disconnected, measure coil resistance between the solenoid terminals and compare to vehicle spec. Replace solenoid if out of range or open/shorted.
With harness connected, backprobe the power and ground pins at the solenoid. Verify constant power supply and good ground (with reference to chassis).
Command the solenoid ON/OFF or vary duty via a scan tool while monitoring voltage at the connector. Observe change in voltage/duty and listen/feel for solenoid operation.
If the driver output is suspect, use a lab scope to inspect the PCM/ECM driver waveform for proper switching and absence of abnormal spikes or shorts.
If wiring is good and solenoid checks good but the driver does not switch correctly, test for shorts to power/ground between driver and solenoid. Repair wiring or replace the PCM/ECM if driver is faulty (confirm per manufacturer procedure).
After repairs, clear codes, run the engine and re-check live data under varied loads to ensure the fault does not return.

Likely causes

Damaged wiring harness/connector (pin corrosion, broken wire, chafing)
Defective oil pressure control solenoid (coil open/short or mechanical seizure)
Poor or intermittent ground at the engine or control module
Low or unstable battery/system voltage affecting driver operation
PCM/ECM driver stage failure (less common)

Fault status

⚠️ Status

Oil Pressure Control Solenoid Circuit Malfunction — electrical problem detected in the oil pressure control solenoid circuit. Inspect wiring, connector, solenoid and control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours