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Q: engine check light on 2003 Cadillac CTS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
engine check light came on and when i put the obd II the code came back p0128
(1) Answer
This code means that your engine temperature is outside of the normal threshhold. When this happened to me, it was because my thermostat had failed.

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