P0307 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 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.
Code P0307 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) 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.
What are the Possible Causes of the DTC P0307?
- 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?
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
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0307 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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Information for Specific Makes
- P0307 Audi — Cylinder 7 Misfire Condition
- P0307 Buick — Cylinder 7 Misfire Detected
- P0307 Cadillac — Cylinder 7 Misfire Detected
- P0307 Chevrolet — Cylinder 7 Misfire Detected
- P0307 Chrysler — Cylinder 7 Misfire Detected
- P0307 Dodge — Cylinder 7 Misfire Detected
- P0307 Ford — Cylinder 7 Misfire Detected
- P0307 GMC — Cylinder 7 Misfire Detected
- P0307 Hummer — Cylinder 7 Misfire Detected
- P0307 Infiniti — Number 7 Cylinder Misfire Detected
- P0307 Jeep — Cylinder 7 Misfire Detected
- P0307 KIA — Cylinder 7 Misfire Detected
- P0307 Lexus — Cylinder 7 Misfire Detected
- P0307 Lincoln — Cylinder 7 Misfire Detected
- P0307 Mercedes-Benz — Cylinder 7 Misfire Detected
- P0307 Mercury — Cylinder 7 Misfire Detected
- P0307 Mitsubishi — Cylinder 7 Misfire Condition
- P0307 Nissan — Number 7 Cylinder Misfire Detected
- P0307 Oldsmobile — Cylinder 7 Misfire Detected
- P0307 Pontiac — Cylinder 7 Misfire Detected
- P0307 Ram — Cylinder 7 Misfire Detected
- P0307 Toyota — Cylinder 7 Misfire Detected
- P0307 Volkswagen — Cylinder 7 Misfire Condition
Frequently Asked Questions about P0307 Code
1. What are common symptoms of OBDII code P0307 - Cylinder 7 Misfire Detected?
- Common symptoms include engine misfiring, rough idling, loss of power, and increased fuel consumption.
2. What are the possible causes of a cylinder 7 misfire in a vehicle?
- Potential causes include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or issues with the engine's timing.
3. How can I diagnose the source of the misfire in cylinder 7?
- Diagnosis typically involves checking spark plugs, ignition coils, fuel injectors, compression levels, and performing a visual inspection for any visible issues like vacuum leaks.
4. Can driving with a misfiring cylinder 7 cause further damage to the engine?
- Yes, driving with a misfire can potentially cause damage to the catalytic converter, oxygen sensors, and other engine components over time.
5. What are some general repair tips for addressing OBDII code P0307?
- Start by checking and replacing the spark plugs, inspecting the ignition coils, testing the fuel injectors, and verifying the compression in cylinder 7.
6. Is it safe to continue driving my vehicle with a cylinder 7 misfire?
- It is not recommended to drive with a misfiring cylinder as it can lead to further damage and potentially compromise the vehicle's performance and fuel efficiency.
7. How much does it typically cost to repair a cylinder 7 misfire issue?
- The cost of repairing a cylinder 7 misfire can vary depending on the specific cause, but it may range from a few hundred to over a thousand dollars, including parts and labor.
8. Can a DIY enthusiast fix a cylinder 7 misfire issue at home?
- Depending on the underlying cause, DIY repairs like replacing spark plugs or ignition coils may be possible, but more complex issues may require professional diagnosis and repair.
9. Will resetting the OBDII code P0307 clear the misfire issue?
- Resetting the code will clear the check engine light temporarily, but the underlying misfire problem in cylinder 7 will likely reappear if not addressed and fixed.
10. How important is it to address OBDII code P0307 promptly?
- It is crucial to address a cylinder 7 misfire promptly to prevent potential damage to the engine, ensure optimal vehicle performance, and maintain fuel efficiency.
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