P0308 Ram 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 Ram 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.
Code P0308 Ram Description
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.
What are the Possible Causes of the DTC P0308 Ram?
- 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 Ram?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0308 Ram 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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Frequently Asked Questions about P0308 Ram Code
1. What are the common symptoms of OBDII code P0308 in a Ram truck?
- Common symptoms include engine misfiring, rough idle, loss of power, and increased fuel consumption.
2. What are the possible causes of a cylinder 8 misfire in a Ram truck?
- Potential causes include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or a faulty engine control module.
3. How can I diagnose the source of the cylinder 8 misfire in my Ram truck?
- Diagnostic steps may include performing a visual inspection, checking spark plugs and ignition coils, conducting a compression test, and using a scan tool to monitor live engine data.
4. Can a dirty fuel injector cause a cylinder 8 misfire in a Ram?
- Yes, a dirty or clogged fuel injector can disrupt the fuel delivery to cylinder 8, leading to a misfire.
5. Is it safe to drive my Ram with OBDII code P0308 present?
- It is not recommended to drive the vehicle with a cylinder 8 misfire as it can cause further damage to the engine and catalytic converter.
6. How can I repair a cylinder 8 misfire in my Ram truck?
- Repair options may include replacing spark plugs, ignition coils, fuel injectors, addressing vacuum leaks, performing a carbon cleaning, or reprogramming the engine control module.
7. Can a bad ignition coil cause a cylinder 8 misfire in a Ram?
- Yes, a faulty ignition coil can cause a lack of spark in cylinder 8, resulting in a misfire.
8. What role does the engine control module (ECM) play in a cylinder 8 misfire?
- The ECM controls the ignition timing and fuel delivery to each cylinder, so a malfunctioning ECM can contribute to a cylinder 8 misfire.
9. How do I reset the OBDII code P0308 in my Ram after making repairs?
- You can reset the code by using an OBDII scanner to clear the code, or it may clear on its own after a certain number of drive cycles if the issue is resolved.
10. Can a cylinder 8 misfire be caused by a wiring issue in a Ram truck?
- Yes, damaged or corroded wiring connecting the ignition system components or fuel injectors to the ECM can lead to a cylinder 8 misfire.
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