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AutoCodes – RAM – P0305 RAM

P0305 RAM Code - Cylinder Misfire Fault Detected

Quick Answer

When a misfire occurs, engine speed will fluctuate. Common causes include Faulty spark plug 5, Clogged or faulty fuel injector 5, Faulty ignition coil 5. 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
P0305 RAM indicates Cylinder Misfire Fault Detected .
Common causes
Common causes include Faulty spark plug 5, Clogged or faulty fuel injector 5, Faulty ignition coil 5.
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 1,665
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on May 02, 2021
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Code P0305 RAM Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.
OBDII Code P0305 RAM - Cylinder Misfire Fault Detected - AutoCodes.com
P0305 RAM Code - Cylinder Misfire Fault Detected
What does this mean?

What are the Possible Causes of the DTC P0305 RAM?

  • Faulty spark plug 5
  • Clogged or faulty fuel injector 5
  • Faulty ignition coil 5
  • Fuel injector 5 harness is open or shorted
  • Fuel injector 5 circuit poor electrical connection
  • Ignition coil 5 harness is open or shorted
  • Ignition coil 5 circuit poor electrical connection
  • Insufficient cylinder 5 compression
  • Incorrect fuel pressure
  • Intake air leak

How to Fix the DTC P0305 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.

What does this mean?

Code Tech Notes

The P0305 code means that cylinder 5 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 5. 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 P0305 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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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 P0305 RAM Code

1. What does the OBDII code P0305 mean on a RAM vehicle?

P0305 indicates a misfire has been detected in cylinder 5 of your RAM's engine.

2. What are the common symptoms of a P0305 code?

Symptoms include rough idling, reduced engine power, poor fuel economy, engine hesitation, and possibly the check engine light illuminating.

3. What are the possible causes of a P0305 code?

Common causes include a faulty spark plug, bad ignition coil, clogged fuel injector, vacuum leak, low compression, or an issue with the cylinder 5 wiring.

4. Can I still drive my RAM with a P0305 code?

Driving with a P0305 code is not recommended as it can cause further engine damage, such as overheating the catalytic converter or worsening the misfire.

5. How can I diagnose a P0305 code on my RAM?

Start by inspecting the spark plug, ignition coil, and wiring for cylinder 5. If these components are fine, check for fuel injector issues, vacuum leaks, or perform a compression test.

6. How much does it cost to fix a P0305 code?

The cost depends on the root cause. Replacing a spark plug may cost $50-$150, while ignition coil or fuel injector repairs could range from $200-$500 or more.

7. Can a dirty fuel injector cause a P0305 code?

Yes, a clogged or malfunctioning fuel injector can disrupt fuel delivery to cylinder 5, causing a misfire and triggering the P0305 code.

8. How can I prevent a P0305 code from recurring?

Regular maintenance, such as spark plug replacement, ignition system inspections, and using quality fuel, can help prevent cylinder misfires.

9. Will a P0305 code cause long-term engine damage?

If left unaddressed, a P0305 code can lead to severe engine damage, including catalytic converter failure and uneven wear on engine components.

10. Can a vacuum leak cause a P0305 code?

Yes, a vacuum leak near cylinder 5 can lead to an air/fuel imbalance, which may cause a misfire and trigger the P0305 code.

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