P0351 Code - Ignition Coil 1 Primary/Secondary Circuit Malfunction

What Does P0351 Mean?

The PCM has detected a fault in the primary or secondary circuit of one or more ignition coils. The majority of OBD-II equipped vehicles utilize a “coil on plug” system to provide ignition spark. In this system, an ignition coil is secured to the engine in a manner that allows for the use of a small spark plug wire or plug boot. Each ignition coil is electronically controlled by the PCM.

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What are the common causes of P0351 ?

To sum things up, the common causes for code P0351 are as follows:

• Faulty ignition coil
• Problem in the ignition coil circuit
• Problem with the PCM

How do you troubleshoot P0351 ?

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

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