P4A78 Willys-overland 675 OBD Code

OBD/2 P4A78 error code description and symptoms.

Variable Cam Timing Over-advanced (Bank 1) The comprehensive component monitor (CCM) monitors the VCT position for an over-advanced camshaft timing.
The test fails when the camshaft timing exceeds a maximum calibrated value or remains in an advanced position. Cam timing improperly set No oil flow to the VCT piston chamber Low oil pressure VCT solenoid valve stuck closed Camshaft advance mechanism binding (VCT unit) P4A78 DTC is a check of the VCT unit.

To check for an open circuit, trace along the length of the transmission control circuit, checking for breaks in the wiring. Repair any broken wiring and make sure all connectors are fully seated and locked.Pay close attention to connectors, looking for corrosion, bent or broken pins, or moisture in the connector. Repair any connector issues even if they are not specifically part of the transmission control circuit as they may serve a function in providing power to the transmission control circuit.

P4A78 Willys-overland 675 Error Code Repair Process :

If your check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system P4A78 and engine control unit are in charge of monitoring a bunch of different , and if they get a reading that's a little out of whack, up pops the check engine light.

Difficulty Level (Soso)

Repair Time (50 Min.)

Cost Prediction : $ 40-75

Common Causes of Willys-overland 675 P4A78 OBD2 Code

A common cause of code P4A78 is the failure of , but there are several other possible causes as well, such as ;

• Camshaft advance mechanism binding (VCT unit)
• Faulty select solenoid
• EVAP canister or fuel tank leaks
• Foreign matter caught in fuel filler cap

P4A78 is a kind of Powertrain Trouble Code Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

P4A78 code for other Willys-overland cars

You can view according P4A78 DTC for your car model. We selected several models to see obd2 solutions click and view it.

• P4A78 Wills Sainte Claire A
• P4A78 Wills Sainte Claire B
• P4A78 Wills Sainte Claire W
• P4A78 Willys Ace
• P4A78 Willys-overland 475
• P4A78 Willys-overland 685
• P4A78 Willys-overland 77
• P4A78 Willys-overland Aero-willys
• P4A78 Willys-overland Dauphine
• P4A78 Willys-overland Interlagos
• P4A78 Willys-overland Jeep
• P4A78 Willys-overland Rural
• P4A78 Willys-overland Whippet

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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