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P2328 OBD-II Trouble Code: Ignition Coil J Primary Control Circuit High

Check Engine Light

P2328 code definition

Ignition Coil J Primary Control Circuit High

What the P2328 code means

P2328 is an OBD-II generic code for the Ignition Coil K Primary Control Circuit High to the Engine Control Module (ECM). This means the primary coil circuit has an short circuit causing the high voltage signal to the ECM.

What causes the P2328 code?

  • The ECM detects a high voltage signal return on the primary circuit of the coil
  • The coil could be shorted internally in the primary circuit
  • The wiring or connection to the coil may have a shorted to power wire on the primary circuit

What are the symptoms of the P2328 code?

  • The Check Engine Light will be illuminated and the code set in ECM memory as a fault.

  • The engine fault may be P2328, and also a misfire code to the cylinder.

  • The engine will run rough and hesitate.

  • The short may cause internal damage to the ECM.

How does a mechanic diagnose the P2328 code?

  • Scans and documents the code in the ECM

  • Diagnoses as per the manufacturer's pinpoint test to check the primary circuit of the coil

  • Clears the ECM code P2328 and verifies whether the code comes back

  • Tests the coil primary internal circuit for continuity; within specification or shorted.

  • Test and check the primary coil connector and wiring for shorts in the wiring.

Common mistakes when diagnosing the P2328 code

  • Clearing ECM memory codes before checking the freeze frame data of the failure.
  • Failing to clear ECM codes after the P2328 codes are fixed.
  • Replacing the defective coil without checking or replacing the spark plugs.
  • Replacing primary damaged wiring with an incorrect size wire.

How serious is the P2328 code?

Code P2328 is an indication that the coil primary circuit has failed and the coil is not firing anymore. This will cause the engine to misfire on the cylinder with the defective coil.

What repairs can fix the P2328 code?

Additional comments for consideration regarding the P2328 code

Code P2328 is common with vehicles that have a 12 cylinder motor and with coils on each cylinder. The primary circuit is what powers and fires the coil. Shorted primary circuits may blow a fuse on some vehicles.

Need help with a P2328 code?

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