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P3493 is a diagnostic trouble code (DTC) for "Cylinder 12 Exhaust Valve Control Malfunction". 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. 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.
P3493 is the OBD-II code for Cylinder 12 Exhaust Valve Ctrl Circuit/Open. Cylinder 12 tells you that the issue is occurring at cylinder 12.
A cylinder exhaust valve vents fuel vapors produced by the engine. The vehicle’s computer controls when the valves open and close, as well as monitors whether the timing meets the expected specifications. When the computer receives a signal from the cylinder 12 exhaust valve which is outside of the normal range, a fault in the circuit is detected and the vehicle will set the P3493 code.
This code may set due to:
Very rarely, the root of the problem could be a bad PCM (powertrain control module) or ECM (engine control module). This code is typically due to other faults like bad wiring, so all other diagnostic avenues should be exhausted before turning to computer failure.
The Check Engine Light will likely come on, you may experience poor acceleration, and fuel efficiency may suffer. When a cylinder exhaust valve code sets, the variable valve timing system in the vehicle typically disables.
Your technician may perform the following steps in order to find the problem:
The vehicle will still operate, however an exhaust valve circuit malfunction can impair the power needed to drive safely. It’s wise to have this code diagnosed and addressed by a qualified technician as soon as possible in order to prevent dangerous driving conditions as well as a chain reaction of potential future damage to other components.
Steps your technician may perform to resolve this DTC may include:
Whenever a DTC is set involving the complex parts of the engine, cylinders, and valves, the diagnostic process can become complicated. A qualified mechanic has the necessary specialized tools to find the problem quickly and efficiently, and get you back on the road.
In addition, technicians keep up to date on current service bulletins which may offer guidance on common problems which occur in particular vehicle makes and models. This knowledge allows your mechanic to start by identifying potential common problems which may be affecting your vehicle.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.