Code P0128Monitor
Coolant Thermostat Temperature Below Regulating Temperature
Your engine isn't warming up properly - like leaving your house door open in winter. Uses more gas and wears engine faster.
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Monitor and Maintain
This issue is not immediately critical but should be addressed at your next service.
Recommended Actions:
- •Note the code for your next service
- •Monitor for any changes in symptoms
- •Can combine with next scheduled maintenance
- •Check if code returns after clearing
What This Code Means
The engine is not reaching proper operating temperature, usually due to a stuck-open thermostat.
"Your engine isn't warming up properly - like leaving your house door open in winter. Uses more gas and wears engine faster."
Common Causes
Stuck-open thermostat (most common)
Low coolant level
Faulty coolant temperature sensor
Cooling fan running continuously
Faulty thermostat housing
Symptoms You May Notice
Professional Diagnostic Steps
Our technicians will perform these checks:
Commonly Affects These Vehicles
Note: This code can appear in any vehicle. These are just the most common.
Repair Cost Breakdown
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- ASE Certified Technicians
- Latest Diagnostic Equipment
- Warranty on All Repairs
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Frequently Asked Questions About Code P0128
Can I keep driving with code P0128?
Safe to drive but fix soon to prevent poor fuel economy and engine wear
How much will it cost to fix P0128?
The repair approach depends on the specific cause and your vehicle.The most common cause (stuck-open thermostat (most common)) usually costs on the lower end of this range.
Will code P0128 clear itself?
While the check engine light may turn off if the condition improves temporarily, the code will remain stored in your vehicle's computer. The underlying issue still needs to be addressed to prevent the code from returning and potentially causing damage.
Is P0128 covered under warranty?
Coverage depends on your vehicle's warranty status and the specific component that failed. Extended warranties may cover this repair.
Don't Guess - Get Professional Diagnosis
Code P0128 can have multiple causes. Our diagnostic process ensures we fix the right problem the first time.