P0128 on JEEP RENEGADE — Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Q: "What does P0128 mean on a JEEP RENEGADE?"

"P0128 indicates: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). This is a fuel and air metering code. 5 JEEP RENEGADE owners have reported this to NHTSA."

Q: "What are the most common causes of P0128 on JEEP RENEGADE?"

"Based on 5 NHTSA reports, the most commonly cited components are: Engine, Air Bags,Service Brakes,Engine, Power Train. These percentages are based on the component field in owner complaints."

Q: "Is P0128 serious on my JEEP RENEGADE?"

"Of 5 NHTSA reports for this code on JEEP RENEGADE, 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 RENEGADE shows P0128?"

"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 P0128 Means on Your JEEP RENEGADE

P0128 is a diagnostic trouble code indicating: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). This code relates to the fuel and air metering system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

5 JEEP RENEGADE owners have reported this issue to NHTSA across model years 2015-2016. Most reports come from the 2016, 2015 model years. The most commonly reported component is Engine (60.0% of reports).

Real JEEP RENEGADE Owner Reports

Source: NHTSA Complaints Database

"Service engine light came on, code p0128, faulty thermostat. seems to be a common problem."

— 2015 JEEP RENEGADE owner · ENGINE · Filed 01/08/2019

"Thermostat failure code p0128 appeared and thermostat needed to be replaced. as this vehicle had recall on the cooling fan assembly, this failure is directly related to the malfunction of the fan unit."

— 2016 JEEP RENEGADE owner · ENGINE · Filed 01/25/2020

"Jeep renegade with only 40k miles (4k out of warranty) and engine coolant thermostat just stopped working. entire housing has to be replaced just to fix the one problem. the problem was made known via service light coming on with "service engine" message appearing on dash."

— 2016 JEEP RENEGADE owner · ENGINE · Filed 01/12/2020

"I turned on my jeep renegade with the automatic start button in like 30 weather. i drove it down the highway for about 10 minutes and the service engine light turned on. i also had the air bag, brake warning sign turn on. i stopped to put gas and just the service engine light stayed on."

— 2016 JEEP RENEGADE owner · AIR BAGS,SERVICE BRAKES,ENGINE · Filed 03/12/2019

"2016 jeep renegade trailhawk had to replace the thermostat do to code p0128 had 51,000 miles should be a recall on this because it cost me"

— 2016 JEEP RENEGADE owner · POWER TRAIN · Filed 02/05/2018

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

📊 Complaint Trend by Model Year

1

'15

4

'16

Common Causes on JEEP RENEGADE

Based on NHTSA complaint component analysis for this vehicle.

ENGINE 60%

AIR BAGS,SERVICE BRAKES,ENGINE 20%

POWER TRAIN 20%

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 P0128 mean on a JEEP RENEGADE? ▾

P0128 indicates: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). This is a fuel and air metering code. 5 JEEP RENEGADE owners have reported this to NHTSA.

What are the most common causes of P0128 on JEEP RENEGADE? ▾

Based on 5 NHTSA reports, the most commonly cited components are: Engine, Air Bags,Service Brakes,Engine, Power Train. These percentages are based on the component field in owner complaints.

Is P0128 serious on my JEEP RENEGADE? ▾

Of 5 NHTSA reports for this code on JEEP RENEGADE, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my JEEP RENEGADE shows P0128? ▾

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.