Skip the auto shop - Our mechanics make house calls

P2302 OBD-II Trouble Code: Ignition Coil "A" Secondary Circuit

check engine light logo

P2302 trouble code code definition

P2302 is a general OBD2 diagnostic trouble code indicating a fault within the ignition coil A secondary circuit. This code may be seen with misfire codes as well as other ignition system codes.

What the P2302 code means

The P2302 code means that the ignition coil A secondary circuit has experienced a malfunction. The malfunction is detected by the vehicle's ECU when it tries to control the secondary ignition circuit. This causes a Check Engine Light to be illuminated on the dashboard and a failsafe mode to be enabled. Once the failsafe mode is enabled it will remain until the fault is resolved or normal operation is observed.

What causes the P2302 code?

  • Spark plugs or plug wiring need replaced
  • Failed ignition coil A
  • ECU failure
  • Short or open in the ignition coil harness
  • Poor or loose electrical connection

What are the symptoms of the P2302 code?

  • Check Engine Light seen on the dashboard
  • Engine misfiring
  • Lack of power or running roughly
  • Reduced fuel milage

How does a mechanic diagnose the P2302 code?

  • A mechanic will begin by hooking up a scan tool to check for any codes stored in the ECU as well as any freeze frame data present. This will all be noted then the codes will be cleared for a fresh start.

  • The vehicle will be test driven in an attempt to duplicate the symptoms.

  • Once the code reappears, a visual inspection will be performed looking for damaged wiring and broken components.

  • Next the spark plug and plug wires will be inspected.

  • The signal to the ignition coil will be checked and then the ignition coil itself will be tested for excessive resistance.

  • Lastly the ECU will be tested.

Common mistakes when diagnosing the P2302 code

  • A common mistake is just replacing the spark plugs without doing any testing and expecting the fault to be resolved. In some cases replacing the spark plugs may fix the fault but definitely not in all cases.

  • All diagnostic steps must be performed in the proper order and in its entirety to diagnose the P2302 code effectively.

How serious is the P2302 code?

The P2302 code can cause misfires and other drivability concerns. If these symptoms are severe the vehicle should not be driven and must be repaired as soon as possible for normal vehicle operation.

What repairs can fix the P2302 code?

Additional comments for consideration regarding the P2302 code

The P2302 code can be extremely difficult to diagnose without the proper tools. One such tool is a professional grade scan tool. The professional scan tool allow access to the data stream for the vehicle which can tell technicians information that would otherwise be unavailable or difficult to obtain.

Need help with a P2302 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

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

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!

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.


Post a question and get free advice from our certified mechanics.


More related articles

Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...

Related questions

Q: Car stalls out of nowhere

Hello - what a frustrating problem to solve! You may have provided a key clue to the solution, given that it requires another vehicle to jump start it to get it going again. This MAY mean that the increased starting...

Q: Transmission acting up and Check Engine and AT light coming on.

If the car makes a clunking sound associated with a jolt, the most likely cause for that would be a transmission or engine mount. Enlist the help of a YourMechanic technician to check these mounts. The technician will likely have...

Q: New battery & fuel pump. Hours later car starts and shuts down 3X in a row. Finally it starts, 48 hours later, won't start at all

Checking all the fuses was a good move. I would also want to put a scan tool on it and check for diagnostic trouble codes (DTCs) as well as seeing the data that the computer is seeing. A fuel pressure...