While a GMC Yukon is certainly a nice way to travel, the 4L60 transmission has its share of problems. Some of those are slipping between the gears, harsh or erratic shifts. So let’s take a look and find out what the best solution might be.
What Transmission Do I Have?
The Problem
Back in 2008, General Motors issued the TSB 08-07-30-008B, because many drivers had reported experiencing slipping and an unusually harsh 1-2 shift. These symptoms were usually accompanied by a check engine light and the diagnostic trouble codes P0804 and/or P1870.
It was determined that this problem could be caused by the torque converter or torque converter clutch not functioning properly. The reason for this could be:
A cracked or leaking 4L60 TCC enable solenoid
A cracked or leaking TCC PWM solenoid
A failed torque converter clutch valve
A damaged turbine shaft O ring seal
What Transmission Do I Have?
Given the expense of removing and tearing down the transmission, just to see which one of these parts has failed, in my make the most financial sense to simply replace it with a remanufactured 4L60 transmission from a company like Street Smart Transmission. Their R&D department is already made the appropriate modifications to keep this problem from happening. And you can a generous three-year – unlimited mile nationwide warranty to boot. To learn more, click here.
