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P3486 is a diagnostic trouble code (DTC) for "Cylinder 11 Exhaust Valve Control Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $69.99. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
When a P0346 trouble code is stored it signals that the Powertrain Control Module (PCM) has detected a problem in cylinder 11 associated with performance. Other trouble codes that might show up as well include a P3481, P3482, P34883, P34884, P34885, P34887, and P3488 trouble code.
The way a V12 engine works is that when not under heavy load, or during light driving conditions, the engine disables some of the cylinders. The PCM does this using data received from the mass airflow sensor, with the PCM then instructing certain cylinders to shut down. This is called variable displacement, which is accomplished with reduced oil flow to the valve lifters of the cylinders in question and the stopping of the intake valves and exhaust filters from opening. In the case of a V12, up to six cylinders can be shut down in this way. When the PCM detects a fault in the reduced valve mode, a P03486 trouble code is stored and the Check Engine light illuminates.
In addition to a defective throttle position sensor, a P3486 code has some other causes. These include a low oil level in the engine, reduced oil pressure on the lifters, or restricted oil flow in the engine oil passages. Some other causes include a defective cylinder deactivation solenoid, intake control manifold absolute pressure sensor, mass air flow sensor, lifters, or wiring and connector problems within the cylinder deactivation solenoid harness or cylinder deactivation solenoid circuit.
In addition to a stored code and a lit Check Engine light, symptoms of a P3486 trouble code include a vibrating engine, lowered fuel efficiency, and sluggish acceleration. The storage of a P3486 trouble code usually leads to the disabling of variable valve timing until the problem is fixed and the code is cleared.
In order to clear a P3486 trouble code, a mechanic needs to perform a diagnostic using an advanced scanner, a manual pressure gauge, air compressor, and a digital volt/ohm meter. The mechanic must also perform the following steps when diagnosing the P3486 trouble code:
Mechanics often forget to clear the oil passageways of buildup or sludge when diagnosing and treating a P3486 trouble code. The clogged passageway can cause the engine oil pressure to fall and contribute to poor engine operation, especially with the lifters in the cylinder.
While not as serious as other stored codes, a P3486 trouble code, if left unattended, can do irreparable harm to your vehicle's engine, especially in the case of a bad lifter. Even if your engine components are not damaged, you can still expect to experience a decrease in the fuel efficiency and an increase in engine emissions of the vehicle in question.
When repairing and clearing a P3486 trouble code, mechanics should perform the following:
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