p0128
Moderate
Nissan · Sedans
Coolant Thermostat (Coolant Temp Regulating Malfunction)
Quick Answer
Error code P0128 on your Nissan Sedans means: Coolant Thermostat (Coolant Temp Regulating Malfunction). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Monitor coolant temperature with scanner
2
Check coolant level and look for leaks
3
Test thermostat operation
4
Inspect coolant temperature sensor
5
Perform coolant system pressure test
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Thermostat
Coolant temperature sensor
Engine coolant
Water pump
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