AutoCodes – Saturn – P1305 Saturn

P1305 Saturn Code - Ignition Coil 2 Primary Feedback Circuit

Quick Answer

The Diagnostic Trouble Code (DTC) Ignition Coil Primary Feedback Circuit monitors the primary circuitry of individual ignition coils for successful completion of an ignition event. Common causes include Faulty Ignition Coil 2, Ignition Coil 2 harness is open or shorted, Ignition Coil 2 circuit poor electrical connection. 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 Saturn indicates Ignition Coil 2 Primary Feedback Circuit.
Common causes: Common causes include Faulty Ignition Coil 2, Ignition Coil 2 harness is open or shorted, Ignition Coil 2 circuit poor electrical connection.
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.

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Code Popularity 392

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 28, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1305 Saturn Description

The Diagnostic Trouble Code (DTC) Ignition Coil Primary Feedback Circuit monitors the primary circuitry of individual ignition coils for successful completion of an ignition event. The ignition trigger signal and ignition fail-safe input signal provide crucial information in the control of ignition system timing and activation of the fail-safe function. Based on the initial timing angle, calculated from the crankshaft and the camshaft position signals, Powertrain Control Module (PCM) calculates the ignition trigger signal. The ignition trigger signal is then sent to the ignition control circuitry located in each ignition coil. Ignition control circuitry initiates the ignition dwell period by commanding the power transistor ON. When PCM determines the proper time to provide a spark, the PCM turns OFF the ignition trigger signal. In response to the PCM signal, the ignition coil control circuitry turns OFF the power transistor, producing a high voltage discharge from secondary coil windings. After a spark has occurred, the control circuitry sends an ignition fail-safe input signal back to the PCM, confirming that an ignition event has taken place. If the ignition fail-safe input signal is not received by the PCM, a cylinder-specific DTC will be set.
Anytime the fail-safe input signal is lost, engine operation will enter the fail-safe function. If engine load exceeds certain parameters during fail-safe function, FUEL CUT-OFF mode is activated, and fuel injector operation is ceased. The suspension of fuel injection in FUEL CUT-OFF mode protects the catalytic converter from damage. Damage can occur when excess unburned fuel reaches the converter and causes the catalyst to overheat.

OBDII Code P1305 Saturn - Ignition Coil 2 Primary Feedback Circuit - AutoCodes.com — P1305 Saturn Code - Ignition Coil 2 Primary Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC P1305 Saturn?

Faulty Ignition Coil 2
Ignition Coil 2 harness is open or shorted
Ignition Coil 2 circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1305 Saturn?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1305 Saturn code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1305 Saturn code?

Need more information on how to fix the P1305 Saturn code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1305 Saturn code diagnosed by a professional: Find a repair shop in your area

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 Saturn Code

1. What are the common symptoms of OBDII code P1305 on a Saturn related to the Ignition Coil 2 Primary Feedback Circuit?

Symptoms may include engine misfires, rough idling, loss of power, and illuminated Check Engine Light.

2. What typically causes OBDII code P1305 to trigger on a Saturn?

The code is usually triggered by issues with the ignition coil, such as a faulty coil, loose connections, or wiring problems in the ignition system.

3. How can I diagnose the cause of OBDII code P1305 on my Saturn?

You can start by inspecting the ignition coil, spark plugs, and related wiring for any visible damage. Using a multimeter to test the coil's resistance and checking for proper voltage can also help diagnose the issue.

4. Can a DIY enthusiast repair OBDII code P1305 on a Saturn related to the Ignition Coil 2 Primary Feedback Circuit?

Yes, some DIY-friendly repairs include replacing the ignition coil, spark plugs, or repairing damaged wiring. However, if you're unsure, it's best to consult with a professional mechanic.

5. Is it safe to continue driving my Saturn with OBDII code P1305 present?

It's not recommended to drive with this code unresolved, as it can lead to further engine damage, decreased fuel efficiency, and potential safety hazards. It's best to address the issue promptly.

6. Are there any preventive maintenance tips to avoid OBDII code P1305 on a Saturn?

Regularly inspecting and maintaining your ignition system, including the ignition coil and spark plugs, can help prevent issues that trigger this code. Following the recommended service schedule is also important.

7. Can weather conditions affect the triggering of OBDII code P1305 on a Saturn?

Extreme weather conditions, such as excessive heat or moisture, can sometimes exacerbate ignition system problems and trigger the code. Ensuring your vehicle is properly protected from the elements can help prevent issues.

8. How long does it typically take to repair OBDII code P1305 on a Saturn at a professional auto repair shop?

Repair times can vary depending on the exact cause of the code and the extent of the repairs needed. In general, a skilled mechanic can diagnose and repair the issue within a few hours to a day.

9. Will resetting the Check Engine Light resolve OBDII code P1305 on a Saturn?

Resetting the Check Engine Light may temporarily turn it off, but if the underlying issue causing the code is not addressed, the light is likely to come back on. It's essential to diagnose and fix the root cause.

10. Does OBDII code P1305 on a Saturn affect vehicle performance?

Yes, this code can impact the vehicle's performance by causing engine misfires, rough idling, and a decrease in power and fuel efficiency. Addressing the issue promptly can help restore optimal performance.