This issue can lead to reduced fuel efficiency, poor. The p0128 code indicates that the engine’s coolant temperature is lower than what the thermostat should be regulating Understand the p0128 coolant thermostat below regulating temperature through historical fault pattern analysis
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Normal coolant temp should reach 160°f within 15 minutes of starting
The pcm monitors thermostat data and if it doesn’t receive sensor signals, takes too long to reach temperature, or never. Monitor coolant temperature with a scan tool during a cold start If temperature rises slowly and. Learn all about the p0128 code, what causes coolant temperature issues, and how to diagnose and fix common problems to maintain optimal engine performance.
