P2331 OBD-II Trouble Code: Ignition Coil K Primary Control Circuit High

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Cost of diagnosing the P2331 code

P2331 is a diagnostic trouble code (DTC) for "Ignition Coil K Primary Control Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $50.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate* Credit towards follow-up repair Earliest Availability
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Toyota $154.99 $50.0
BMW $164.99 $50.0

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P2331 code definition

Ignition Coil K Primary Control Circuit High

What the P2331 code means

P2331 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 P2331 code?

  • The ECM got 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 P2331 code?

  • The Check Engine Light will be illuminated and the code set in ECM memory as a fault.
  • The engine fault may be P2331, and also a misfire code to the cylinder.
  • The engine will run rough and hesitate.
  • The short may be caused by internal damage to the ECM.

How does a mechanic diagnose the P2331 code?

  • Scans and documents codes in the ECM
  • Diagnoses as per the manufacturer's pinpoint test to check the primary circuit of the coil
  • Clears the ECM code P2331 and verifies whether the code comes back
  • Tests the coil primary internal circuit for continuity to be within specification or shorted
  • Tests and checks the primary coil connector and wiring for shorts in the wiring

Common mistakes when diagnosing the P2331 code

  • Clearing ECM memory codes before checking the freeze frame data of the failure
  • Failing to clear ECM codes after the P2331 codes are fixed
  • Replacing the defective coil without checking or replacing the spark plug
  • Replacing primary damaged wiring with an incorrect size wire

How serious is the P2331 code?

Code P2331 is an indication that the coil primary circuit has failed and the coil is not firing any more. This will cause the engine to misfire on the cylinder with the defective coil.

What repairs can fix the P2331 code?

Additional comments for consideration regarding the P2331 code

Code P2331 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 P2331 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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