Question about 2006 GMC Envoy Denali
2006 GMC Envoy Denali w/5.3 liter 4x4 auto transmission 153k miles. There are no service lights on and there are no codes available. The transmission acts like there is no 2nd gear. The car will shift from 1st gear into what I believe is 3rd gear when the car is traveling fast enough ~30/35 mph and then shifts normally into 4th/overdrive. Prior to the total loss of 2nd gear, if you accelerated hard, occasionally the truck would slam into second gear where it almost felt like the tires would break loose (peel out). If memory serves correctly, I would also hear a whistle or screech when this scenario occurred. I replaced the transmission filter and fluid but this had no effect. Any suggestions to try before I have to replace the entire transmission?
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Posted on Jan 02, 2017
The blinking overdrive button is telling u that a serious fault has occurred in the electronic controls or a mechanical fault such as excess slippage is occurring.
Posted on Nov 06, 2008
Check both O2 sensor(s) and catalytic coverter.. P0420 means catalyst below threshold. Also check the sensor at the transmission and solenoid.
Posted on Feb 06, 2009
thottle positioning sensor? if trans has overdrive could be a lock up piece, dont remember name of it. there is a lucas oil product that might help. if it is the overdrive.
Posted on Nov 06, 2009
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