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Home >> Dodge and Ram >> 2023 >> ProMaster 2500 >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 3.6L - DTCS P0057 To P0133 >> DTC Troubleshooting >> P0128-Thermostat Rationality >> Possible Causes

Possible Causes

Possible Causes
LOW COOLANT LEVEL
COOLING SYSTEM ISSUES - POOR FLOW DUE TO A RESTRICTION OR MECHANICAL ISSUE
FAULTY THERMOSTAT - OPENING TOO SOON

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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