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- - Code P0128 (https://www.gmforum.com/2000-2005-90/code-p0128-272673/)

87National

Feb 25, 2008 11:16 PM

Code P0128

Check Engine Light came on this morning so I took it to advance to read the error code. I got a P0128 Coolant Temp Below Thermostat Regulator Temp code. What causes this and how do I fix it?

Archon

Feb 26, 2008 12:04 AM

The most common cause is the thermostat. However, also make sure that you aren't low on coolant.

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