Trouble code p128

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12-29-2010, 05:58 PM

Wes Lowery

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Location: Whittier, CA

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Trouble code p128

On my 2004 CTS, I read code P128 on my reader when the check engine light came on. I reset it and it didn't come back for a couple of months. Where do I start troubleshooting? Thermostat or temperature sensor?

12-30-2010, 09:39 AM

Stealth

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did the AC got serviced recently?

P128 (E128) .................. A/C was disabled because of high refrigerant pressure

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