Code
P06DA
Generic
P — Powertrain
Engine Oil Pressure Control Circuit/Open
Views:
UK: 21
EN: 141
RU: 95
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in control circuit
- Disconnected or corroded connector at solenoid or ECM
- Failed oil pressure control solenoid/actuator (open coil)
- Blown fuse or faulty relay supplying solenoid power
- Poor or missing ground for solenoid or ECM
- High-resistance connection or internal short-to-open in harness
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power or limp mode (on some vehicles)
- Oil pressure warning lamp or message
- Erratic or incorrect oil pressure regulation (high/low)
- Unusual engine noise if oil pressure becomes low
- Possible DTCs related to oil pressure sensor or pump
What to check
- Verify engine oil level and condition before electrical diagnosis
- Scan for additional DTCs and read freeze frame/live data
- Visually inspect wiring harness and connectors for damage, corrosion, or oil contamination
- Check fuses and relays related to oil pressure control circuit
- Backprobe solenoid connector to measure supply and control signals
- Measure resistance of oil pressure control solenoid coil with connector disconnected
Signal parameters
- Control signal: PWM duty 0–100% (exact duty varies with engine load and RPM)
- Typical PWM frequency range: ~20–200 Hz (vehicle dependent — consult service manual)
- Supply voltage (key ON): battery voltage ~11–14 V at power pin
- Coil resistance (typical): roughly 5–50 ohms (highly model-dependent — use OEM spec)
- Expected ground continuity: near 0 ohms between solenoid ground and chassis/battery negative
Diagnostic algorithm
- Read/record all codes and freeze frame data, then clear codes and attempt to re-create
- Verify engine oil level and correct if low; confirm no restrictions in oil passages
- Perform a visual inspection of solenoid, connector, and harness for damage or oil contamination
- Check related fuses and relays; replace if blown or faulty
- With ignition ON (engine OFF) backprobe solenoid connector: verify battery voltage at power feed and a ground/command signal at control pin
- Measure solenoid coil resistance with connector disconnected; compare to OEM specification (an open or infinite reading indicates failed coil)
- If coil resistance good, start engine or command solenoid and measure control signal (voltage or PWM duty) at connector; use oscilloscope for accurate PWM assessment
- Inspect/repair any open circuits, corroded terminals, or poor grounds found; perform wire repair or pin replacement as needed
- If wiring and solenoid verify good but no command from ECM, test driver output at ECM connector and verify power/ground to ECM; consider ECM replacement only after all wiring and component tests fail
- After repairs, clear codes, run engine through operating conditions, and verify DTC does not return and oil pressure control operates normally
Likely causes
- Broken/abraded wire near moving harness points or firewall
- Corroded pins/terminals at solenoid connector or ECM connector
- Failed oil pressure control solenoid coil (open)
- Blown fuse or failed relay in power feed to solenoid
- Poor ground at engine block or chassis
Fault status
Status
Stored when the engine control module detects an open or loss of continuity in the engine oil pressure control circuit (oil pressure control solenoid/actuator). May set MIL and affect oil pressure regulation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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