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Home >> Jeep >> 2023 >> Grand Cherokee Altitude, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 60 (5.7L - DTCS P0069 To P0132) >> DTC Troubleshooting >> P0128 Thermostat Rationality >> Possible Causes

Possible Causes

WARNING: This page is about a different variant/trim than selected.
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  .