P0128

DTC P0128 COOLANT THERMOSTAT (ENGINE COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE)

DTC DETECTING CONDITION:
- Detected when two consecutive driving cycles with fault occur.
- GENERAL DESCRIPTION

TROUBLE SYMPTOM:
Thermostat remains open.

CAUTION: After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode Reading and Clearing Diagnostic Trouble Codes

Step 1-2: