P2302 - IGNITION COIL "A" SECONDARY CIRCUIT

The ignition coil current flow is provided by the Powertrain Control Module (PCM) through a switched ground signal, which comes from the coil driver. Once the coil driver is turned on, the current is immediately stored until it reaches a maximum value, which is determined by the inductance and resistance of the coil. After the current is turned off, a secondary high voltage surge is created in the magnetic field, which is why the spark plug is triggered.

This high voltage surge creates a return voltage to the PCM, which uses it to perform ignition diagnostics. The ignition system is constantly monitored by the PCM for proper ignition performance. When a voltage short is detected in the secondary circuit of the ignition coil “A”, the DTC P2302 OBDII code is set.

• Check Engine light illuminated.
• Engine misfires.
• Reduced engine power.
• Fuel consumption increases.

The factors for which the P2302 OBD2 diagnostic code is stored are:

• Perhaps the spark plug or the plug wiring is defective.
• The ignition coil harness may have a short circuit.
• The ignition coil "A" may be faulty.

To troubleshoot problems related to the P2302 OBDII fault code you should do the following:

• Perform a visual inspection of all the cables related to the system. You should repair or replace any of these that have obvious damage.
• Verify that the spark plug wires and plugs are in good condition. Make any necessary corrections.
• Check that the signal and ignition coil resistance is within the parameters established by the manufacturer. If the values obtained do not meet the requirements, proceed to replace the coil.