Last reported case: 1 months ago
Based on 3 owner reports (3 from Reddit)
What is P0128?
P0128 indicates your engine coolant is not reaching the proper operating temperature, typically due to a faulty thermostat stuck open. This is a high-severity powertrain code because it reduces fuel efficiency, increases emissions, and can cause premature engine wear. Based on real owner reports, this issue is particularly common in Jeep and Dodge vehicles, with some models even having fire-related recalls mentioned by owners.
Common Causes:
- A faulty thermostat stuck in the open position, preventing the engine from warming up properly (most common cause)
- Low coolant level due to a leak, as mentioned by a Nissan Altima owner
- A defective coolant temperature sensor providing incorrect readings to the engine computer
Symptoms:
- Check Engine Light illuminated on the dashboard
- Poor fuel economy due to the engine running too cool
- Heater blowing cold air or taking a long time to warm up
- Higher than normal emissions during idle, as noted by an owner who had to hold RPMs to prevent a light
🚗P0128 on 2013 HONDA Civic
This page focuses specifically on P0128 issues reported by 2013 HONDA Civic owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2013 HONDA Civic Owners:
Parts Often Involved:
What Owners Say
Real experiences from 2013 HONDA Civic owners
“But i noticed when i turn ON the fan 'circulation' button in car, i smell like burnt rubber or other kind of smell, this didn't happened before. Is this because of coolant?”View original
“When i cold start the car, the blue light for cold engine oil goes off on time (same as before, normal). After few minutes.”View original
These are real experiences shared by 2013 HONDA Civic owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 3 discussions about P0128 from 2013 HONDA Civic owners across automotive communities.
Success rate (0%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 1/16/2026