Code
P1110
NISSAN
P — Powertrain
Intake Valve Timing Control Solenoid
Views:
UK: 15
EN: 42
RU: 28
AI status
Completed
Completed
100%
Causes
- Faulty intake valve timing control (VTC) solenoid/solenoid valve
- Open, shorted or corroded wiring or connector to the solenoid
- Low, dirty, or contaminated engine oil (affects VVT operation)
- Stuck or mechanically seized VVT actuator/cam phaser
- Failed ECM or poor ground/reference circuit
- Faulty oil control valve (OCV) or internal valve obstruction (sludge/debris)
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or poor acceleration
- Rough idle, stalling, or hesitation
- Reduced fuel economy and increased emissions
- Unusual ticking or cam-related noise from front of engine
- Possible limp-home mode if ECM limits timing
What to check
- Read freeze frame and pending codes; confirm P1110 and any related cam/timing codes
- Visual inspection of intake VTC solenoid connector, wiring harness and ground for damage, corrosion or oil contamination
- Check engine oil level, quality and service history (sludge, burnt oil)
- Measure solenoid coil resistance with meter at engine cold — compare to spec
- Backprobe solenoid connector with engine cranking/running to check supply voltage and ground/PWM signal
- Scan tool live data: commanded VTC position/duty cycle vs actual feedback (if available)
Signal parameters
- Coil resistance (typical): ~6–30 ohms (manufacturer-specific — consult service data)
- Supply/reference voltage: ~12 V at key ON (should be within 0.5 V of battery)
- Control signal: ECM typically uses PWM; duty cycle 0–100% to control oil flow and cam phase
- PWM frequency: often in the tens to few hundreds of Hz (varies by model)
- Ground continuity: near 0 ohms to chassis ground when commanded
Diagnostic algorithm
- Confirm the code with an OBD-II scanner and clear codes to see if it returns.
- Inspect connector and wiring for damage, corrosion or oil intrusion; repair as needed.
- Check engine oil level and condition; replace oil and filter if dirty or low and retest.
- With ignition ON (engine off) measure supply voltage at solenoid connector; should be ~12 V on the power side.
- Measure solenoid coil resistance across the solenoid pins; compare to service spec. Replace if open or out of range.
- Start engine and backprobe the control pin; verify ECM provides expected PWM signal and that ground is present when commanded.
- If electrical checks good but issue persists, remove solenoid and inspect for blockage, sludge or sticking; clean or replace as required.
- If solenoid replacement does not correct code, inspect VVT actuator/cam phaser for mechanical seizure or timing chain/wear and perform further mechanical diagnosis per service manual.
- If wiring and mechanical checks good, suspect ECM or intermittent wiring; perform wiggle tests and consult manufacturer diagnostics before replacing ECM.
Likely causes
- Oil contamination or low oil level causing solenoid or actuator to stick
- Intermittent open/short in solenoid power or ground circuit
- Defective solenoid coil (electrical failure)
- Connector corrosion or poor pin contact at solenoid
- Internal VVT actuator seizure due to sludge or mechanical failure
Fault status
Status
P1110 indicates the engine control module has detected an abnormal condition with the intake valve timing control solenoid circuit or its behaviour. This may be caused by a faulty solenoid, wiring/connectors, low or dirty oil, or a mechanical problem with the VVT actuator. The issue can affect cam timing, causing reduced performance and increased emissions. Further electrical and mechanical checks are required.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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