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Home >> Jeep >> 2024 >> Grand Cherokee Altitude X, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (5.7L - DTCS P0117 To P0132) >> DTC Troubleshooting >> P0128-Thermostat Rationality >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2024 Jeep Grand Cherokee L. However, it is still accessible from the selected car via links, so may be relevant.
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  .