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I have a 2004 GMC Sierra 5.3L, what does P1258 mean?

Vehicle: 2004 GMC Sierra 5.3L

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Hi there

This code means Engine coolant overtemp protection mode active.

This can be caused by overheating, low engine coolant or a faulty coolant temp sensor.
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P1258 GMC - Engine Coolant Overtemperature Protection Mode Active

Read more: https://www.autocodes.com/p1258_gmc.html

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