Does the vehicle have coil on plug ignition or coilpack ? And it's not
primary or secondary coil malfunctioning It's primary or secondary circuit .
I'm assuming it has a coil pack because you say plug wires.
P0350 - Ignition Coil (Undetermined) Primary/Secondary Circuit Malfunction
Each ignition primary circuit is continuously monitored. The test fails when the PCM does not receive a valid IDM pulse signal from the ignition module (integrated in the PCM).
P0351 - Ignition Coil A Primary/Secondary Circuit Malfunction
- Open or short in the Ignition START/RUN circuit.
- Open coil driver circuit.
- Coil driver circuit shorted to ground.
- Damaged coil.
- Damaged PCM.
- Coil driver circuit shorted to VPWR.
See the description for DTC P0350.
See the possible causes for DTC P0350.
Pull the spark plugs out an look at them , check the gap ,if too wide replace them . If the spark plug gap gets too worn ,the spark won't jump the gap. It will find the least resistance path to ground ,and it will do it inside the coil . Going from the secondary circuit back to the primary coil an to ground through the PCM - engine computer . The PCM has transistors inside that open an close the primary side to ground ,this builds up a magnetic field around the secondary inducing high voltage spark . Well this can short out the transistor inside the PCM . Most of the time that's what these type codes mean . The PCM would need to be replaced an programmed . This can also damage the catalytic converter. Your best bet , take your vehicle to a qualified repair shop.