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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 159 (3.6L - DTCS P000A To P0157) >> DTC Troubleshooting >> P0128-Thermostat Rationality >> When Monitored

When Monitored

WARNING: This page is about a different car, the 2016 Dodge Journey and 2015 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.

With the engine running, ambient temperature between -8°C (17.6°F) and 50°C (122°F), start up coolant temperature less than 50°C (122°F) and average vehicle speed greater than 16 kph (10 mph) until coolant temperature reaches 85°C (185°F).