p0128
Moderate
Nissan · SUVs
Coolant Thermostat (Coolant Temp Regulating) Malfunction
Quick Answer
Error code P0128 on your Nissan SUVs means: Coolant Thermostat (Coolant Temp Regulating) Malfunction. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
  1. Faulty thermostat
  2. Failed coolant temperature sensor
  3. Coolant level low
  4. Blockage in cooling system
  5. Water pump failure
How to Fix It
1
Check coolant level and condition
2
Monitor coolant temperature with scanner
3
Check thermostat operation
4
Inspect for coolant leaks
5
Test coolant temperature sensor resistance
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Related Error Codes
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