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Old 01-03-2009, 09:52 PM   #1
nevets
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Default Code p0128

I have a 2002 SL2 and the service engine soon light came on. I had it tested and the mechanic said the Coolant Temperature Sensor should be changed. Is this right for code p0128? (That's what was on the invoice)
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Old 01-03-2009, 11:26 PM   #2
Cheyne
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2000 SL2
Default Re: Code p0128

2002 has the brass sensor. They usually don't cause a problem, but yours could have failed.

P0128 = Coolant Thermostat (coolant below normal temp range)

Did they replace the thermostat also? What does the temp gauge read now while driving down the road?

If the code is gone and the temp gauge is reading around 3/8, you should be good to go.
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Old 01-03-2009, 11:48 PM   #3
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1998 SC2
Default Re: Code p0128

What that code is telling you is that the engine was still cold according to the ECTS after the PCM decided it had adequate time to warm up. The problem could be eiter a bad ECTS or a failed thermostat. How long does it take for the engine to warm up? Does the temperature gauge come to 3/8 or a bit above is a short time? If the gauge gets up to 3/8 or a bit above then its probably a tired thermostat and you need a new one.

This link will provide mor details of this code.

http://www.hotrodlane.cc/New%20LS%20...TC%20P0128.htm
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