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.

MORE:

How to understand car OBD codes

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.

MORE:

How can I reduce the costs of car maintenance?

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.

MORE:

What does the Check Engine Light mean?

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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