VVT Solenoid Problems in Jeep Wranglers — Symptoms and Fixes

What VVT Does

Variable valve timing adjusts the timing of the intake and exhaust camshafts to optimize performance, fuel economy, and emissions across the RPM range. The 3.6L Pentastar uses VVT on both camshafts. Engine oil pressure is routed through VVT solenoids and phasers to adjust cam timing. When the system works correctly, you get smooth power delivery and good fuel economy. When it fails, the engine runs poorly and the check engine light comes on.

The VVT solenoids are located on the front of the engine, one per camshaft — four total on the Pentastar. They control the flow of oil to the cam phasers. If a solenoid fails mechanically or electrically, the cam phaser cannot move to the commanded position and the engine computer sets a diagnostic code. The engine will run in a default timing mode that reduces performance and fuel economy.

Common Symptoms

The most common symptom is a check engine light with codes P0010 through P0014 or P0020 through P0025. These codes indicate a problem with the VVT solenoid circuit or the camshaft position response. The engine may run rough at idle, have reduced power, and show decreased fuel economy. In some cases, the engine may stall when coming to a stop because the cam timing is not adjusting properly for idle conditions.

A failed VVT solenoid can also cause a rattling noise from the front of the engine. This is the cam phaser trying to move but not getting the correct oil pressure because the solenoid is stuck. If the solenoid is completely stuck in one position, you may not notice any performance change at all — but the check engine light will be on and the engine will not pass an emissions inspection.

Replacement Procedure

VVT solenoid replacement is straightforward on the Pentastar. The solenoids are accessible from the front of the engine and can be replaced with basic hand tools. Disconnect the electrical connector, remove the retaining bolt, and pull the solenoid straight out. Some oil may drain out, so have a catch pan ready. Install the new solenoid with a new O-ring and torque the retaining bolt to 7 lb-ft. Clear the diagnostic codes and test drive.

Always use OEM or high-quality aftermarket solenoids. Cheap aftermarket solenoids often fail quickly because of inferior internal components. If you are replacing one solenoid, consider replacing all four since they are relatively inexpensive (about $50 each) and the labor is minimal for the front ones. The rear solenoids require removing the intake manifold, which is more labor-intensive.

Bottom Line

VVT solenoid failure on the Pentastar causes a check engine light and rough running but is a straightforward fix. The solenoids are accessible and inexpensive. Replace all four at once if the front solenoids fail, and use OEM-quality parts. If the check engine light code points to the rear solenoids, consider replacing the oil cooler housing at the same time since the intake manifold comes off for both jobs.

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