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44th Miss Inf · 06-14-2023, 02:43 PM

Just an update

Been almost a year, hadn’t been able to work on it again until recently. Could reset the TCC solenoid, but it would always come back. Never got rid P0121. Wires from computer to TPS and pedal all checked good.

Yesterday I installed a new computer, did crank relearn, and functioned the transmission solenoids (buddy let me use his SnapOn Modis)
Looked again, NO codes! Put about 50 miles on it last night. Runs and shifts perfect. Wife running it around some today and cleaning it back up. Hopefully the computer was the problem.

06-14-2023, 02:43 PM	#4
44th Miss Inf Registered User Join Date: Sep 2002 Location: Liberty, Mississippi Posts: 671	Re: 2011 Suburban issues Just an update Been almost a year, hadn’t been able to work on it again until recently. Could reset the TCC solenoid, but it would always come back. Never got rid P0121. Wires from computer to TPS and pedal all checked good. Yesterday I installed a new computer, did crank relearn, and functioned the transmission solenoids (buddy let me use his SnapOn Modis) Looked again, NO codes! Put about 50 miles on it last night. Runs and shifts perfect. Wife running it around some today and cleaning it back up. Hopefully the computer was the problem.