AutoCodes – Chrysler – P0308 Chrysler

P0308 Chrysler Code - Cylinder 8 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 8, Clogged or faulty fuel injector 8, Faulty ignition coil 8. 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: P0308 Chrysler indicates Cylinder 8 Misfire Detected.
Common causes: Common causes include Faulty spark plug 8, Clogged or faulty fuel injector 8, Faulty ignition coil 8.
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 1,865

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 P0308 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) P0308 correspond to cylinders 8. 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 P0308 Chrysler - Cylinder 8 Misfire Detected - AutoCodes.com — P0308 Chrysler Code - Cylinder 8 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0308 Chrysler?

Faulty spark plug 8
Clogged or faulty fuel injector 8
Faulty ignition coil 8
Fuel injector 8 harness is open or shorted
Fuel injector 8 circuit poor electrical connection
Ignition coil 8 harness is open or shorted
Ignition coil 8 circuit poor electrical connection
Insufficient cylinder 8 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0308 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 P0308 code means that cylinder 8 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 8. 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 P0308 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 P0308 Chrysler Code

1. What are the common symptoms of OBDII code P0308 in a Chrysler indicating a cylinder 8 misfire detected?

The common symptoms include engine vibration, loss of power, rough idling, and potentially an illuminated check engine light.

2. What are the possible causes of a cylinder 8 misfire detected in a Chrysler triggering code P0308?

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

3. How can I diagnose the specific cause of the cylinder 8 misfire in my Chrysler when facing OBDII code P0308?

Diagnosis typically involves conducting a thorough inspection of the spark plugs, ignition coils, fuel injectors, and performing a compression test to identify the root cause of the misfire.

4. Is it safe to continue driving my Chrysler with OBDII code P0308 related to cylinder 8 misfire detected?

It is not recommended to drive the vehicle with a misfire as it can lead to further damage to the engine components. It's best to address the issue promptly.

5. Can a dirty fuel injector be a potential cause of OBDII code P0308 in a Chrysler?

Yes, a dirty or clogged fuel injector can disrupt the fuel delivery to cylinder 8, leading to a misfire and triggering the P0308 trouble code.

6. Are there any simple repair tips I can try to fix the cylinder 8 misfire causing OBDII code P0308 in my Chrysler?

You can start by replacing the spark plugs and inspecting the ignition coils for any signs of damage. Additionally, cleaning or replacing the fuel injector for cylinder 8 may help resolve the issue.

7. How important is it to address a cylinder 8 misfire detected in a Chrysler with OBDII code P0308 promptly?

Addressing the misfire promptly is crucial to prevent potential damage to the catalytic converter, other engine components, and to ensure optimal engine performance and fuel efficiency.

8. Can a faulty engine control module (ECM) cause the cylinder 8 misfire triggering OBDII code P0308 in a Chrysler?

Yes, a malfunctioning ECM can disrupt the proper functioning of the fuel injection system or ignition timing, leading to a misfire in cylinder 8 and the illumination of the check engine light.

9. Is it necessary to reset the OBDII code P0308 after repairing the cylinder 8 misfire issue in a Chrysler?

It is recommended to clear the trouble code after addressing the misfire problem. This allows you to monitor if the issue has been successfully resolved and if any new issues arise.

10. Can extreme weather conditions affect the occurrence of a cylinder 8 misfire in a Chrysler causing OBDII code P0308?

Extreme weather conditions, such as very cold temperatures, can affect the combustion process and potentially lead to misfires. Ensuring the vehicle is properly maintained can help mitigate these issues.