Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit Description
The VVT system controls intake valve timing in response to driving conditions. ECM uses input from Crankshaft Position (CKP) sensor and Variable Valve Timing (VVT) sensor to control Oil Control Valve (OCV). OCV varies oil pressure between 2 circuits changing intake camshaft position in relation to crankshaft angle.
DTC is set when ECM detects an open or short in OCV circuit. DTC P1656 is for bank No. 1 OCV. DTC P1663 is for bank No. 2 OCV. Possible causes are:
- Open or short in OCV circuit.
- Faulty OCV.
- Faulty ECM.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.