AutoCodes – Chrysler – P0307 Chrysler

P0307 Chrysler Code - Cylinder 7 Misfire Detected

Quick Answer

The Engine Control Module (ECM) uses information from the crankshaft position sensor and the camshaft position sensor to determine when an engine cylinder misfire is occurring. Common causes include Faulty spark plug 7, Clogged or faulty fuel injector 7, Faulty ignition coil 7. 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: P0307 Chrysler indicates Cylinder 7 Misfire Detected.
Common causes: Common causes include Faulty spark plug 7, Clogged or faulty fuel injector 7, Faulty ignition coil 7.
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 1,687

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 Aug 09, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0307 Chrysler Description

The Engine Control Module (ECM) uses information from the crankshaft position sensor and the camshaft position sensor to determine when an engine cylinder misfire is occurring. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM can detect individual cylinder misfire events.
Extreme cylinder misfire events can cause catalytic converter damage. The malfunction indicator lamp (MIL) will flash when the conditions for catalytic converter damage are present. The Diagnostic Trouble Codes (DTC) P0307 correspond to cylinders 7. When the ECM detects that one or more specific cylinders are misfiring, the DTC for the respective misfiring cylinder will set, and up to 2 of the corresponding fuel injectors are disabled for a minimum of 30 s. The ECM will then re-enable the fuel injector and, after approximately 200 engine revolutions, will determine if the misfire is still present. If the misfire is still present, the ECM will disable the fuel injector again repeating the process. If the misfire is not present, the fuel injector will remain enabled by the ECM. In Spark Ignition Direct Injection (SIDI) system applications, if a fuel injector fault DTC is set during a misfire event, the ECM will not re-enable the injector.

OBDII Code P0307 Chrysler - Cylinder 7 Misfire Detected - AutoCodes.com — P0307 Chrysler Code - Cylinder 7 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0307 Chrysler?

Faulty spark plug 7
Clogged or faulty fuel injector 7
Faulty ignition coil 7
Fuel injector 7 harness is open or shorted
Fuel injector 7 circuit poor electrical connection
Ignition coil 7 harness is open or shorted
Ignition coil 7 circuit poor electrical connection
Insufficient cylinder 7 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0307 Chrysler?

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 does this mean?

Code Tech Notes

The P0307 code means that cylinder 7 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 7. If the problem persists more tests need to be done to diagnose the problem, see "Possible Causes".

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0307 Chrysler 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.

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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 P0307 Chrysler Code

1. What are the common symptoms of OBDII code P0307 in a Chrysler indicating a cylinder 7 misfire?

- Common symptoms include rough idling, loss of power, engine vibration, and an illuminated check engine light.

2. What are the possible causes of a cylinder 7 misfire in a Chrysler triggering code P0307?

- Potential causes include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or issues with the engine control module.

3. How can I diagnose the specific cause of a cylinder 7 misfire in my Chrysler with code P0307?

- To pinpoint the cause, perform a thorough inspection of spark plugs, ignition coils, fuel injectors, and vacuum lines. Additionally, a compression test and a scan tool can help identify the issue.

4. Can driving with a cylinder 7 misfire due to code P0307 damage my Chrysler's engine?

- Continuing to drive with a misfire can potentially damage the catalytic converter and other engine components over time, so it is best to address the issue promptly.

5. What are some DIY repair tips for resolving a cylinder 7 misfire related to OBDII code P0307 in a Chrysler?

- DIY repair tips include replacing spark plugs, ignition coils, or fuel injectors, checking for vacuum leaks, and ensuring proper engine compression.

6. Is it necessary to reset the OBDII code P0307 after repairing a cylinder 7 misfire in a Chrysler?

- Yes, it is recommended to clear the code using an OBDII scanner after addressing the underlying issue to reset the check engine light.

7. Can weather or environmental factors contribute to a cylinder 7 misfire triggering OBDII code P0307 in a Chrysler?

- Extreme weather conditions, such as cold temperatures or high humidity, can sometimes exacerbate misfire issues, but the root cause is typically related to mechanical components.

8. How much should I expect to pay for professional repairs related to a cylinder 7 misfire with OBDII code P0307 in my Chrysler?

- Repair costs can vary depending on the exact cause of the misfire, but expect to pay anywhere from $100 to $500 for parts and labor, potentially more for complex issues.

9. Can a cylinder 7 misfire related to OBDII code P0307 be intermittent in a Chrysler?

- Yes, misfires can sometimes be intermittent, occurring sporadically due to specific driving conditions or temporary issues with components like spark plugs or fuel injectors.

10. Are there any preventive maintenance steps I can take to reduce the likelihood of a cylinder 7 misfire triggering OBDII code P0307 in my Chrysler?

- Regularly scheduled maintenance, such as changing spark plugs, inspecting ignition components, and using high-quality fuel, can help prevent misfire issues and code P0307 in the future.