P0303 on JEEP LIBERTY — Cylinder 3 Misfire Detected

Q: "What does P0303 mean on a JEEP LIBERTY?"

"P0303 indicates: Cylinder 3 Misfire Detected. This is a ignition system code. 2 JEEP LIBERTY owners have reported this to NHTSA."

Q: "What are the most common causes of P0303 on JEEP LIBERTY?"

"Based on 2 NHTSA reports, the most commonly cited components are: Engine, Power Train. These percentages are based on the component field in owner complaints."

Q: "Is P0303 serious on my JEEP LIBERTY?"

"Of 2 NHTSA reports for this code on JEEP LIBERTY, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my JEEP LIBERTY shows P0303?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P0303 Means on Your JEEP LIBERTY

P0303 is a diagnostic trouble code indicating: Cylinder 3 Misfire Detected. This code relates to the ignition system system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

2 JEEP LIBERTY owners have reported this issue to NHTSA across model years 2006-2012. Most reports come from the 2006, 2012 model years. The most commonly reported component is Engine (50.0% of reports).

Real JEEP LIBERTY Owner Reports

Source: NHTSA Complaints Database

"Vehicle started exhibiting a cyl #3 misfire showing code p0303 and all the signs included in tsb 09-007-06. was also diagnosed by the dealer and having defective cylinder valves and valve locks."

— 2006 JEEP LIBERTY owner · ENGINE · Filed 03/15/2011

"I was driving my vehicle on the street when my check engine light came on and the car started to run rough and then the engine light started flashing. i parked it on a side street and had it towed to mechanic. i was told that the 3 & 5 cylinder was misfiring."

— 2012 JEEP LIBERTY owner · POWER TRAIN · Filed 01/11/2019

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

1

'06

1

'12

Common Causes on JEEP LIBERTY

Based on NHTSA complaint component analysis for this vehicle.

ENGINE 50%

POWER TRAIN 50%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0303 mean on a JEEP LIBERTY? ▾

P0303 indicates: Cylinder 3 Misfire Detected. This is a ignition system code. 2 JEEP LIBERTY owners have reported this to NHTSA.

What are the most common causes of P0303 on JEEP LIBERTY? ▾

Based on 2 NHTSA reports, the most commonly cited components are: Engine, Power Train. These percentages are based on the component field in owner complaints.

Is P0303 serious on my JEEP LIBERTY? ▾

Of 2 NHTSA reports for this code on JEEP LIBERTY, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my JEEP LIBERTY shows P0303? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.