P1145 Possible Causes
- Faulty intake valve timing control solenoid valve
- Intake valve timing control solenoid valve wiring harness is open or shorted
- Poor electrical connection in the intake valve timing control solenoid valve circuit
- Faulty crankshaft position sensor
- Faulty camshaft position sensor
How to Fix Code P1145?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
When is the Code Detected?
When there is a discrepancy between the target angle and the phase control angle degree, the valve will stop functioning and the ECM will trigger code P1145.
Possible Symptoms
- Engine light on (or engine service warning light soon)
- Possible engine lack/loss of power
- Possible rough engine idle
P1145 Meaning
This mechanism hydraulically controls the cam phases continuously with the fixed operating angle of the intake valve.
The engine control module (ECM) receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid valve based on the driving condition. This controls the intake valve closing/opening timing to increase engine torque in the low/mid speed range and output in the high speed range.
The intake valve timing control solenoid valve changes the oil amount and flow direction through the intake valve timing control unit or stops the oil flow. The longer pulse width advances the valve angle. The shorter pulse width retards the valve angle. When the ON and OFF pulse widths become equal, the solenoid valve stops the oil pressure flow to fix the intake valve angle at the control position.