Are there any problems with the GM 8 speed transmission?
According to TSB (Technical Service Bulletin) 18-NA-355, the latest update addresses “torque converter clutch (TCC) shudder conditions on 8L45 and 8L90 ” eight-speed automatic transmissions, RPO codes M5N, M5T, M5U, and M5X. Affected vehicles include Chevrolet, GMC and Cadillac vehicles, as follows.
Is the GMC 6 speed transmission a reliable transmission?
In other words the transmission is reliable if you deal with the clunking. A family member has a 2011 GMC and the 6 speed acts the same and he has over 200,000 miles on it.
What kind of trans fluid does GM use?
As of July 8 th, 2019, GM began using a new type of Mobil 1 automatic transmission fluid for the troublesome transmissions. Customers that complain of shuddering and harsh shifting characteristics in the 8-speed GM transmissions are recommended for a trans fluid flush.
Can a new fluid flush fix a transmission problem?
However, a new fluid flush appears to fix the issues, with some customers beginning to report a dramatic change in shift quality after swapping out the old juice. If the flush doesn’t fix the issue, the next step may be to replace the torque converter, which could be glazed.
Are there any transmission problems with my GMC Truck?
Newer GMC trucks equipped with a 6-speed 6L80 transmission can suffer from various intermittent or constant transmission issues. Symptoms include harsh or delayed shifting, inability to engage certain gears, and slipping when shifting gears. These problems can even lead to transmission overheating in some cases.
Why is the transmission not shifting on my Chevy Silverado?
Take a couple of easy steps to see why your truck is not shifting. No need to panic yet. This article applies to the Chevrolet Silverado GMT800 (1999-2006). Your transmission is just supposed to shift and leave you alone.
Are there any problems with GMC 8 speed transmission?
GMC vehicles with 8-speed 8L90 and 8L45 transmission can develop intermittent problems regarding the transmission temperature. Symptoms that drivers can experience include improbable temperature readings to overheating, slipping, and harsh shifting. These issues will trigger a check engine light, so there will be a fault code stored in DTC memory.
Why is my GMC transmission stuck in 1st gear?
See GMC Transmission Rebult Kits . Clogged or faulty shift solenoids, resulting in electrical glitches or jammings. If the fault is electrical, it may trigger a check engine light. Mechanical issues and clogged solenoids will rarely result in a check engine light. Missing higher gears or transmission stuck in 1st gear.
Is there Trans fluid flush for GM 8 speed transmissions?
Customers that complain of shuddering and harsh shifting characteristics in the 8-speed GM transmissions are recommended for a trans fluid flush. As of August 7 th, GM dealers should also be flushing all potentially affected new vehicles on the lot.
What was the transmission problem on my GMC Yukon?
Limped back to the dealer with only 4 operating gears. The dealer rebuilt it. At 2,430 miles, while in the Sierras outside Yosemite at 2500 feet, the transmission heated up to almost 200 degrees (outside temp only 78), and it came out of gear again. This time it would not shift out of first gear until we let it sit overnight.
When did my Yukon Denali XL have its first transmission failure?
Our 2007 Yukon Denali XL had its first transmission failure at 1,850 miles. At 55MPH it came out of gear, would not re-engage until we turned the ignition off and on three times. Limped back to the dealer with only 4 operating gears. The dealer rebuilt it.
What kind of transmission slips from 2nd to 3rd?
I have a 2004 GMC Yukon Denali. As the title states, my transmission slips while shifting from 2nd to 3rd gear. Right as it is about to shift into 3rd, RPMs just jump and it slips completely for a few seconds until it goes into 3rd.
Is there a transmission defect in a GMC?
An alleged GM transmission defect has gained more coverage as more owners complain of the issue in Chevy pickups, GMC vehicles, Cadillac sedans, and sports cars. Sign In