![]() ![]() With a Jeep P0128 code, the first step is to get it properly diagnosed to figure out what is causing the malfunction in the coolant temperature circuit. Faulty wiring for coolant temperature circuit.Faulty/stuck open thermostat (most common).If either fault is recorded again on the next engine startup, Jeep P0128 code is triggered. ![]() The PCM will record if either of these two criteria is not met. Additionally, once the 160º F threshold is achieved, the recorded engine temperature must not fall below 160º F during operation. Most ECMs mandate that the engine coolant temperature sensor record temperatures above 160º F within 15 minutes of the engine starting. When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to enter a “closed-loop” where readings from the oxygen sensors are used to maintain the efficient air to fuel ratio of 14.7:1. The engine control module (ECM) tracks how long it takes for the engine of a vehicle to reach and maintain the correct operating temperature.
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