Skip the auto shop - Our mechanics make house calls

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

Check Engine Light

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem What the P0121 code means P0121 is a generic OBD-II code which indicates that the Engine Control...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....


Related questions

Q: Starting problem

At 180.000 miles, it could be just about anything. The P0161 and P0140 codes are oxygen sensor codes, and probably don't have anything to do with the starting issue, though you should have that investigated. The P0300 code however is...

Q: Cold weather makes the motor knock

This is a common problem with Hybrid Highlanders. Does the Check Engine Light illuminate when the knocking occurs? If so, Toyota released a technical service bulletin (TSB) related to cold start misfires. The associated TSB (T-SB-0210-11) covers the inspection, diagnosis...

Q: Car runs poorly and stalls 1992 Oldsmobile 88

Hello - the engine hesitation and stalling, along with the Code 42, indicate a problem with ignition timing for your car. On your car, the ignition module provide a basic engine timing profile. While running, ignition timing shifts to the...