What Does the Engine Code P2303 Mean?

The engine code P2303 is designed to detect a short-to-voltage within the vehicle’s ignition coils.
Written by Drew Waterstreet
Reviewed by Melanie Reiff
background
The engine code P2303 is designed to detect a short-to-voltage within your vehicle’s ignition system, specifically the ignition coils. Ignition coils send battery voltage to the vehicle’s engine to trigger an ignition spark.
If you run a strict schedule that requires you to be timely, ignoring an engine code P2303 is one of the worst things you can do. Once this issue is detected, it will be a roll of the dice on whether your vehicle decides to start or not. The odds on this gamble are not too high, so don’t let the house take your money.
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What does the engine code P2303 mean?

Definition: Ignition coil 'B' primary control circuit low
Without proper current flow through your ignition coil, your vehicle is probably not moving from its parking spot. The engine code P2303 means you have an improper current for the ignition system to operate properly. This could be caused by a short or damage to the coil/wiring.
Your Powertrain Control Module (PCM) is constantly monitoring the current levels in your vehicle’s ignition system. The PCM is your friend—it lets you know if there is a discrepancy in current levels by sending you an engine code P2303. 

What causes the engine code P2303?

Expect to hear your mechanic identify the source of the issue as one of the following:
  • Fault in Ignition Coil 'B'
  • Ignition Coil 'B' harness is exposed or shorted
  • Ignition Coil 'B' poor electrical circuitry

How much will it cost to fix?

The costs will vary depending on whether your ignition coils need to be replaced or just repaired.
Replacement ignition coils
cost roughly $60 to $80. In addition to the cost of parts, most maintenance shops charge anywhere between $75 to $150 per hour for labor. 
Expect total costs to range from $150 to $500.
Remember, you're not just paying for new ignition coils. You’re paying for confidence and reliability. Quality and functional ignition coils are key to making sure your vehicle starts up every time you need it.

Common symptoms of the P2303 engine code

The dreaded
Check Engine Light will illuminate
upon the detection of a P2303 engine code. While it may be tempting to ignore, it’s better to get your vehicle checked out right away. Your car may continue to operate for a short time, but expect the following symptoms to arise:
  • Poor acceleration and lower fuel efficiency
  • The engine will not start or will struggle to start
  • The engine will run rough and
    can even stall
    if a short occurs
Don’t procrastinate resolving this issue, it’s easier to drive to the
car repair
shop as opposed to getting a tow there.

Can I fix the engine code P2303 myself?

It typically requires further diagnostic testing to determine if the entire coil is faulty or if the wiring simply has a short. Check for damage to the wiring harness and connectors. 
If you can’t accurately identify the source of the engine code P2303, it’s better to hand the keys over to the mechanic.

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