P2320 OBD-II Trouble Code: Ignition Coil G Secondary Circuit

Check Engine Light

P2320 code definition

Ignition Coil G Secondary Circuit

What the P2320 code means

P2320 is an OBD-II generic code for the engine control module (ECM) detecting ignition coil G or 7 secondary circuit having low ionization. This means that the coil’s spark is not lasting long enough.

What causes the P2320 code?

  • The spark plug coil secondary circuit (to include the coil, coil boot or the spark plug) is shorted or open causing excessive resistance in the coil secondary circuit.

  • The coil primary has internal shorted windings and causes the secondary voltage to be low.

  • The primary return wiring is shorted to ground or there is a cut in the harness back to the ECM.

What are the symptoms of the P2320 code?

  • The Check Engine Light will be illuminated and the P2320 code set in ECM memory as a fault.

  • The engine will run rough or misfire.

  • The engine may run pretty good and then all of a sudden run very rough when the short occurs.

  • The engine may only misfire under a load when the secondary voltage needs to be its highest.

How does a mechanic diagnose the P2320 code?

  • Scans for codes and documents them in the ECM then looks at the freeze frame data for failure

  • Checks the coil for carbon tracking, cracks or the wiring harness having been cut into, causing the short

  • Checks the coil output with a spark checker

  • Removes the coil connection and tests the coil for shorted primary windings

  • Checks the wiring harness for shorts or open circuits from coil to the ECM

  • Checks the spark plug for cracks or a worn electrode

Common mistakes when diagnosing the P2320 code?

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so that the failure may be duplicated and repaired.

  • Trying to test the coil without a spark tester. This may burn out the ECM coil driver if a proper tool is not used.

How serious is the P2320 code?

Code P2320 is a code indicating that the coil secondary spark is not good enough. This may be due to the plugs being worn or cracked. This can also be due to spark grounding inside the head through the plug boot or the coil itself.

What repairs can fix the P2320 code?

Additional comments for consideration regarding the P2320 code

Code P2320 is caused most commonly from an internal coil primary circuit short or open windings. The failure may burn out the ECM coil driver. If the coil and ECM are not replaced at the same time, the ECM may get burned out; it should be replaced with a new coil. Always check the coil primary and secondary resistance for problems if replacing the ECM. It is also recommended to replace the spark plug boot and plug.

Need help with a P2320 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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222 code means The manufacturer specifies a range of acceptable voltage to be produced from the throttle position...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...

Related questions

Q: Gearbox fault warning came on - 2012 Range Rover

Hey there, the battery's low voltage may have been the code they received. You may have to have the body control and transmission module tested for a bad connection and pinpoint tested to see if the gear box fault is...

Q: Check Engine light flashing.

The check engine light flashing is most likely from your engine miss firing on one or more cylinders. The computer should be scanned to see what cylinder is miss firing and that cylinder checked for a failing weak coil pack,...

Q: AC failed and started running rough and the Check Engine Light came on. But NOW its fine.

I wouldn't concern yourself with the timing of your cars symptoms. When a car fails, I liken it to when a light bulb decides to burn out. It was just its time. Everything will eventually fail. I also would strongly...