4l80e transmission 6 speed problems I like having the automatic (as opposed to swapping over to manual 6 speed), but the idea of having the 6 speeds available is very appealing. Dealing with the 4L80E transmission can involve several mechanical challenges. So far the ones I know about are TCI and PATC. Desperate for help! 2003 Suburban 2500, 4L80E with the 6. If the problem is electrical then chances are you can troubleshoot the problem yourself. The 3-4 shift feels like converter is locked, and it hits so hard it feels like you got rear-ended. It’s important to understand these potential problems to maintain the longevity and performance of your transmission. The torque converter has a torque converter clutch. These problems are more than just annoying—they could indicate serious issues. Start with diagnostic error codes and perform a thorough inspection of components. You might face issues related to the torque converter, solenoids, valve body, and others. Wanted to get opinions on these 4L80E-based 6-speed automatics, i. . Troubleshooting a 4L80E transmission involves checking for common issues like fluid leaks or electronic malfunctions. Symptoms are: In "D": hard shifting, accompanied by P0748 code (Pressure Control Solenoid Electrical Fault). Dealing with the 4L80E transmission can involve several mechanical challenges. The input speed sensor (and output speed sensor, mainly used for vehicle speed calculations, both of which carry the same part number) is suspected of failure, according to a GM bulletin, due to its poor open-magnet design. If you own a GM vehicle with a 6-speed transmission, you’re likely familiar with common problems like slipping, shifting issues, or strange noises. Shifts hard 1-2, firm 2-3, and hard to extremely hard 3-4. e. , like the TCI 6X. 0 (4x4). It is this clutch that provides the mechanical coupling from the engine to the transmission. balp vkiuc yxzw weguz kkb kvwp uifwaxp rmqtxkol erjb rhmgxx