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#1
01-09-2008, 07:05 PM
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P0128 error code questions..
My SES light came on today and I had the code read.. P0128.. From the research I have done it means coolant temp below thermostat requirements... What should I try before replacing the thermostat.. I will mention that I have noticed the past week or so it has taken longer to heat the cab of the vehicle than it usually does. Something else to mention is I added some coolant last night because it was a bit low. My temp gauge never goes over normal and the coolant level for the most part holds..
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#2
01-09-2008, 07:28 PM
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Re: P0128 error code questions..
I just went through the same thing with my daughter's S10.
I reset the DTC & drove it around a bit and it didn't come back but the coolant temp didn't show the proper 190-210F reading on the temperature gauge. The heater didn't work good either until I replaced the thermostat. Now the temperature gauge shows 190F and the heater works very well.
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#3
01-10-2008, 06:24 AM
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Re: P0128 error code questions..
I agree with Chris.
Replace the thermostat. They're not that expensive, and they're easy to change. I change mine every 4 years when I replace the coolant.
__________________
It's my opinion, don't take it personal. '04 T&C,'01 Blazer ZR2, '97 Blazer, '97 Sunfire, '85 Vette, '79 Civic, 94 FLSTC
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#4
01-10-2008, 07:21 AM
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Re: P0128 error code questions..
agree with them. thermostat is faulty. replace and double check for leaks since you are losing a bit here and there.
__________________
Disclaimer: I am not perfect, i may be wrong in my advice from time to time. Also note that any advice given is as is with no warranty whatsoever, and i have zero liability if you get hurt for not being safe while working on your vehicle.
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#6
01-11-2008, 10:45 PM
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Re: P0128 error code questions..
Quote:
I think it requires a few driving cycles (on/off) before it'll go off. If it doesn't go off soon, you could always disconnect the battery for 10 minutes. That should reset it. I bought an inexpensive ODBII reader at Advance auto parts that reads and erases codes. Spent less than $50.00 for it. It's paid for itself several times, as my local mechanic charges $90.00 diagnostic time. Had to replace a $90.00 heated oxygen sensor on my daughter's car. The same bill at the mechanic would've been in excess of $300.00. 
__________________
It's my opinion, don't take it personal. '04 T&C,'01 Blazer ZR2, '97 Blazer, '97 Sunfire, '85 Vette, '79 Civic, 94 FLSTC
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#8
01-12-2008, 12:37 PM
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Re: P0128 error code questions..
The light went out today.. Thank goodness.. I hate that damn SES light.. Thanks to everybody who helped...
When I changed the thermostat I also replaced the Coolant and the stock Radiator Cap.. I purchased a stant cap that I believe was 16 PSI.. Any other suggestions..
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