The 2007 Chevy TrailBlazer's transmission is the subject of several TSBs and most owners complain of the inability to shift into certain gears or reverse or high rpms without movement. TSB #PIP4051C, relates to harsh shifting caused by faulty wiring that can be replaced under the bulletin. This also covers rough transmission pump edges that can interfere with electrical connections. Dealers are advised to smooth the pump's edges accordingly. The Trailblazer's second TSB #08-07-30-027, refers to the inability to shift into "drive" or "third" gear and involves replacing the forward sprag assembly. The Trailblazer is also known for harsh shifting between first and second gears that's covered under TSB #08-07-30-008B. Repair consists of replacing the TCC solenoid, torque converter clutch valve or degraded turbine shaft O-ring seal.
Alejandro S
July 16, 2020
The most common transmission problems with the 2007 chevrolet trailblazer is due to shift solenoid failure, transmission wiring issues and harsh gear changes.
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