P0128High Priority
Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)
Category: Powertrain• Fuel and Air Metering
12 articles · 5 makes affected
Owner Data Insights
Most Effective Fixes for P0128
Based on 4 owner reports. Success rates show how often each fix resolved the issue.
50% success
4 reports
Start with the highest success rate fix when diagnosing P0128. If that doesn't resolve the issue, work down the list.
Owner Statistics for P0128
Based on 54 real owner discussions • 5 confirmed solutions
9%
Success Rate
54
Data Sources
About This Data
Statistics are aggregated from real owner discussions on Reddit, automotive forums, and YouTube comments. All data is anonymized and represents actual repair experiences reported by vehicle owners.
P0128 Issues by Vehicle
JEEP
2018 Grand Cherokee
2018 Jeep Grand Cherokee Fuel Economy Dropping? Here's How to Fix It
100 sources
2018 Grand Cherokee
Why is Your 2018 Jeep Grand Cherokee Getting Poor MPG?
100 sources
2018 Grand Cherokee
How to Stop Rattling Noise in Your 2018 Jeep Grand Cherokee
100 sources
2020 Grand Cherokee
2020 Jeep Grand Cherokee Battery Replacement: A Step-by-Step Guide
107 sources