Code
P1023
MITSUBISHI
P — Powertrain
Oil control Valve 2 open
Views:
UK: 2
EN: 9
RU: 3
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring to OCV2
- Corroded or loose connector at the solenoid
- Failed OCV (solenoid) — internal open circuit
- Blown related fuse or loss of power/ground
- Faulty Engine Control Module (ECM) or driver circuit
- Very low engine oil level or severely contaminated oil restricting valve operation
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine performance or hesitation
- Rough idle or stalling at low RPM
- Increased fuel consumption
- Possible abnormal cam timing symptoms (loss of torque, delayed throttle response)
- Possible limp-home mode depending on vehicle strategy
What to check
- Read freeze frame and live data — confirm P1023 and note conditions
- Visually inspect OCV2 connector and wiring for damage, corrosion, or disconnection
- Check engine oil level and condition
- Verify fuses and power/ground circuits for OCV2
- Measure voltage at OCV2 connector while commanding the valve ON/OFF
- Measure solenoid resistance with multimeter and compare to service spec
Signal parameters
- ECM command: PWM duty cycle 0–100% (varies with load/speed); frequency typically in the mid-hundreds of Hz — refer to service manual
- Connector voltage: approximately battery voltage when commanded ON; near 0V when OFF (depends on circuit design)
- Solenoid resistance: typically a low-ohm value (single- to low double-digit ohms) — consult vehicle service data for exact specification
- Open-circuit detection: very high or infinite resistance, or no change in commanded vs reported VVT behavior
Diagnostic algorithm
- Retrieve trouble code(s) and freeze-frame data. Note engine conditions when the code set.
- Perform a visual inspection of the OCV2 harness and connector for damage, corrosion, or oil contamination. Repair any obvious issues.
- Check engine oil level and condition. Top up or change oil if dirty or low, then clear codes and retest.
- With ignition ON (engine off), back-probe the OCV2 connector: verify key-on power and ground presence. Inspect related fuses/relays.
- Command OCV2 ON/OFF with a scan tool while measuring voltage at the connector. Confirm the ECM is commanding and voltage responds accordingly.
- Disconnect connector and measure solenoid coil resistance. If infinite/open, replace the OCV.
- Check continuity between the OCV connector and the ECM pin to rule out broken wiring. Repair any open/high-resistance circuits.
- If wiring and solenoid test good but no command present, suspect ECM driver fault — verify with a known-good replacement or follow manufacturer ECM diagnostics.
- After repairs, clear codes and perform a road or functional test to ensure the code does not return and VVT operation is normal.
- Safety note: do not apply continuous battery voltage to a dry solenoid for prolonged periods. Use service procedures and correct tools.
Likely causes
- Open or high-resistance wiring/connector to OCV2
- Defective oil control valve (electrical open)
- Poor ground or blown fuse supplying OCV2
- Oil condition/level preventing valve movement
- Less likely: ECM driver fault
Fault status
Status
Stored when the ECM detects an open circuit or no response from Oil Control Valve 2 (OCV2) electrical circuit — indicating loss of control of the VVT oil control valve.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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