What the P0356 code means?
If a vehicle is modern enough to feature a PCM (Powertrain Control Module), then it's definitely using a COP (Coil on Plug) ignition system. With a COP, each of the vehicle's cylinders has its own coil. These coils are all controlled by the PCM which attaches to each with two wires. One of these wires is used as a battery feed and the other is the coil driver circuit. The PCM ungrounds and grounds this circuit to deactivate or activate the coil. Amongst other things, this setup makes spark plug wires unnecessary. Instead, the coils sit right above their spark plugs. However, a COP is definitely not without its potential for problems.
What causes the P0356 code?
1. Short to voltage or ground on COP driver circuit.
2. Open on COP driver circuit.
3. Loose connection at coil or broken connector locks.
4. Bad Coil (COP).
5. Faulty Powertrain Control Module.
What are the symptoms of the P0356 code?
The activation of the Check Engine light is one of the most obvious symptoms of this error code. Other symptoms affect the vehicle's drivability, which include:
1. Engine misfire, can be both present or intermittent.
2. Abnormal vibrations when idling or driving.
3. Loss of acceleration.
Common mistakes when diagnosing the P0356 code:
A lot of times, mechanics will rush to carry out a maintenance tune up. Although the vehicle may benefit from such a procedure, it won't make the P0356 code clear. Unfortunately, a comprehensive diagnosis must be undertaken to truly pinpoint the problem (or problems) triggering this code.
What repairs can fix the P0356 code?
Generally, the repairs necessary to clear this code are simple. They will involve one of the following:
1. Repairing or replacing the ignition coil.
2. Repairing or replacing a shorted or open wire in the ignition coil driver circuit.
3. Cleaning, repairing, or replacing the connector if corrosion has damaged it.