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P3458 is a diagnostic trouble code (DTC) for "Cylinder 8 Deactivation/Intake 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 $79.99. 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.
The P3458 code is stored when the measured values for cylinder deactivation mode are not within the range of manufacturer-specified values.
In order to provide good fuel economy, vehicles are designed to deactivate certain cylinders during idling, starting, or other situations. Deactivation occurs when the intake and exhaust valves are prevented from opening by locking pins. During this deactivation, the MAF sensor, the MAP sensor, and the TP sensor are all measuring emissions values and voltage values related to the operation of cylinders. If the system has registered a command to deactivate, but the measured values don’t match what the system knows it should see in this situation, the system registers a fault, and sends the P3458 code to the PCM.
There are a variety of issues that could cause the P3458 code to be stored within the PCM. These may include:
Typically, the only symptom that will be experienced when the P3458 code is stored in the PCM is the illumination of the Check Engine Light. Some vehicle owners may register a decrease in fuel economy.
In order to diagnose the P3458 code, a technician will first scan with the OBD-II scanner and collect the data from the PCM. They should then check all of the solenoid wiring components and connectors, looking for any corroded, loose, shorted, or open components and repairing as necessary. When electrical issues have been eliminated, the technician will continue to go through other possible repairs for the P3458 code.
The most common mistake when diagnosing a code like the P3458 is failure to clear the code after each possible repair, and performing a retest. The easiest way to repair an issue is often to duplicate the failure. If the technician remembers to perform this system clear after each possible repair, it will be much easier to pinpoint the issue.
The P3458 is a very serious issue that needs to be repaired as soon as it is detected. This code indicates that there may be a major malfunction in the vehicle’s ability to deactivate cylinders, which could cause a misfire or total engine failure.
In order to repair the issue causing the P3458 code to be stored in the PCM, a technician will likely begin by checking the electrical components during their diagnostics. If these repairs do not clear the code, other possible repairs include:
If the issue is related to an electrical problem in the engine, these repairs could take longer to diagnose and address. In extreme cases, the ECM may need to be replaced.
The P3458 code is related to the operation of cylinder 8, which may be accompanied by fault codes for the operation of other cylinders, particularly if the issue is related to the common power source that the solenoid harnesses for each use. If there are multiple fault codes related to the operation of cylinders, a pinpoint test to discover the exact area of fault may be required.
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.