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Engine-Codes – Pontiac – P1305 Pontiac

P1305 Pontiac Code - Ignition Coil 2 Primary Feedback Circuit

Quick Answer

The P1305 Pontiac code indicates a problem with the Ignition Coil 2 Primary Feedback Circuit in the vehicle's ignition system. Common causes include Faulty Ignition Coil, Damaged wiring or connectors in the Ignition Coil circuit, Issues with the ECM. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1305 Pontiac indicates Ignition Coil 2 Primary Feedback Circuit.
Common causes
Common causes include Faulty Ignition Coil, Damaged wiring or connectors in the Ignition Coil circuit, Issues with the ECM.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1305 Pontiac Description

The P1305 Pontiac code indicates a problem with the Ignition Coil 2 Primary Feedback Circuit in the vehicle's ignition system. The ignition coil is responsible for converting the low voltage from the battery into the high voltage needed to ignite the fuel-air mixture in the engine's cylinders. The primary feedback circuit is crucial in providing feedback to the engine control module (ECM) about the status of the ignition coil.

OBDII Code P1305 Pontiac - Ignition Coil 2 Primary Feedback Circuit
P1305 Pontiac Code - Ignition Coil 2 Primary Feedback Circuit

Common Causes of P1305 Pontiac

  1. Faulty Ignition Coil
  2. Damaged wiring or connectors in the Ignition Coil circuit
  3. Issues with the ECM
  4. Poor electrical connection
  5. Corrosion or contamination in the circuit

Symptoms of P1305 Pontiac

  1. Engine misfires
  2. Rough idling
  3. Decreased fuel efficiency
  4. Difficulty starting the engine
  5. Illumination of the Check Engine Light

How to Fix P1305 Pontiac

  1. Begin by diagnosing the specific cause of the issue, which may involve testing the Ignition Coil, checking the wiring and connectors, and inspecting the ECM.
  2. Replace the faulty Ignition Coil if necessary.
  3. Repair or replace any damaged wiring or connectors in the circuit.
  4. Clear the diagnostic trouble codes from the ECM.
  5. Test the vehicle to ensure the issue has been resolved and the code no longer appears.

Cost to Fix P1305 Pontiac

The cost of repairing the Ignition Coil 2 Primary Feedback Circuit can vary depending on the vehicle's make and model, the location of the repair shop, and the cost of parts. On average, the repair cost for this issue can range from $150 to $400, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain a specific estimate based on your location and vehicle.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1305 Pontiac Code

1. What does the OBDII code P1305 mean on a Pontiac?

Code P1305 indicates an issue with the Ignition Coil 2 Primary Feedback Circuit, meaning the engine control module (ECM) is not receiving the expected signal from ignition coil 2.

2. What are the common symptoms of a P1305 code in a Pontiac?

Symptoms include engine misfires, rough idling, poor acceleration, reduced fuel efficiency, and the check engine light turning on.

3. What causes the P1305 code to appear in a Pontiac?

Common causes include a faulty ignition coil, damaged or corroded wiring, a defective ECM, or a bad spark plug connected to ignition coil 2.

4. Can I drive my Pontiac with a P1305 code?

Driving with a P1305 code is not recommended as it can lead to further engine damage, reduced performance, and increased emissions.

5. How do I diagnose the P1305 code on my Pontiac?

Diagnosis involves inspecting ignition coil 2, checking its wiring and connectors for damage or corrosion, testing the coil’s resistance, and verifying proper ECM function.

6. How is the P1305 code fixed on a Pontiac?

Repairs may include replacing the faulty ignition coil, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming/replacing the ECM if necessary.

7. How much does it cost to fix the P1305 code on a Pontiac?

Repair costs vary but typically range from $150 to $400, depending on whether the issue is with the ignition coil, wiring, or ECM.

8. Can a bad spark plug cause the P1305 code in a Pontiac?

Yes, a bad or improperly gapped spark plug connected to ignition coil 2 can trigger the P1305 code.

9. How can I prevent the P1305 code from occurring in my Pontiac?

Regular maintenance, including timely replacement of spark plugs and ignition coils, and inspecting wiring for damage, can help prevent this code.

10. Will a P1305 code cause my Pontiac to fail an emissions test?

Yes, a P1305 code can cause increased emissions and is likely to result in a failed emissions test.

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