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#1
12-27-2005, 11:47 PM
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"Check Engine Soon" Code 128 meaning
2001 GMC Jimmy has intermittent "Check Engine Soon" light on. Diagnostic code 128 is what was enter when read. What does this code mean?
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#2
12-28-2005, 07:14 AM
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Re:
Quote:
Did you try to swap to a cooler thermostat? If so don't go below a 180. If you haven't swapped in a newer thermostat, your current one has probably gone bad and is stuck open. If the latter is the case, considering it's a 2001, I would be nervous about DEX-COOL sludge in the cooling system. Replace the thermostat and do an acid based flush on your system. I bet one of your symptoms as well is your heat isn't as hot as it used to be.
__________________
  95 s10 Blazer, EGR Mod, ZQ8 Steering box mod, 99 Center console shifter mod and more... See everything at www.pghconsulting.net/teal
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#3
12-29-2005, 07:58 PM
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Re: "Check Engine Soon" Code 128 meaning
Thanks "rlith".
I had already flushed the system with little luck. Changed the thermostat this morning with a 195 degree one and so far no light and the heat's back to normal. Thanks again for the info.
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#4
12-31-2005, 07:27 AM
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Glad to hear everything is alright...
__________________
95 s10 Blazer, EGR Mod, ZQ8 Steering box mod, 99 Center console shifter mod and more... See everything at www.pghconsulting.net/teal
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