p0128
Moderate
Chrysler · Minivans & Sedans
Coolant Thermostat (Coolant Temp Regulation) Malfunction
Quick Answer
Error code P0128 on your Chrysler Minivans & Sedans means: Coolant Thermostat (Coolant Temp Regulation) 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 operation after cold start
2
Check coolant level and condition
3
Inspect thermostat housing for leaks
4
Replace thermostat if temperatures fluctuate
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 assembly
Coolant
Thermostat gasket
Hose clamps
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