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Description
Merchant Automotive 10499 Allison NSBU Switch with Connector Repair Kit 01-04 6.6L GM Duramax LB7One of the most common problems with the Allison transmission is failure of the Neutral Safety Back Up switch. SYMPTOMS: No start condition Gear shift indicator on dash not following properly Trans stuck in limp mode or fail safe DTC's set indicating pressure switch codes How does it work and why does it cause my transmission not to shift? The vehicle is equipped with a column type shift selector. In addition to the column shifter, another component
One of the most common problems with the Allison transmission is failure of the Neutral Safety Back Up switch.SYMPTOMS:
- No start condition
- Gear shift indicator on dash not following properly
- Trans stuck in limp mode or fail safe
- DTC's set indicating pressure switch codes
How does it work and why does it cause my transmission not to shift?
The vehicle is equipped with a column type shift selector. In addition to the column shifter, another component associated with the shift selector is the Neutral Safety Back Up (NSBU) switch mounted on the selector shaft of the transmission. The NSBU switch transmits selector position information to the TCM. The NSBU switch mounts directly onto the transmission housing, from the outside, and detects the angular position of the shift selector shaft. This position is communicated to the TCM so that certain vehicle control functions can be coordinated with the position of the shift controls. The neutral signal output of the NSBU switch is typically used as confirmation that the transmission is in NEUTRAL or PARK before the engine starter is engaged.
The reason that PSM codes may set is that the NSBU switch and the internal PSM switch "look at each other" and "compare readings" Basically, the NSBU switch lets the TCM know what gear position that you, the driver, have selected. The PSM has the job of telling the TCM what gear the transmission is in based on hydraulic inputs. If the data received from the PSM and the NSBU do not agree, the above mentioned trouble codes may set. The NSBU is subject to water contamination and will allow the switch to give faulty readings.
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4.3 ★★★★★
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Product Reviews
★★★★★ 5
Amazing!
Color: Midnight Green
The Hamile Keyboard Case for iPad (11th & 10th Generation) is a practical accessory for turning your iPad into a more laptop-like setup. Designed with a detachable wireless keyboard and protective case, it’s aimed at students, professionals, and anyone who types frequently on their tablet.
One of its most appealing features is the 7-color backlit keyboard, which makes typing easier in low-light environments while also adding a customizable, stylish look. The backlighting can usually be adjusted in brightness and color, making it both functional and fun to use. The keys are generally responsive and comfortable enough for everyday typing tasks like emails, notes, and document work.
The case itself provides decent protection for the iPad, helping guard against scratches and minor bumps. It also holds the tablet at a stable viewing angle, which is useful for video calls, studying, or streaming. The wireless connection is typically simple to set up via Bluetooth, and the keyboard can be detached when not needed.
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Reviewed in the United States on May 21, 2026
★★★★★ 5
No need to tap my Nails on the screen anymore!
Color: Pink, Color: Pink
Cute, convenient, and definitely needed! I use it every day to carry my emotional support device The keyboard case is sturdy, easy to use, and makes it so much more convenient to take my my girl everywhere. Extra added protection! (I’m clumsy and my iPad has fell quite a few times!) the keyboard works great, I typed a lot of emails and docs! Very happy with this purchase!
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Reviewed in the United States on June 5, 2026
★★★★★ 5
The blue is perfect!
Color: Navy Blue
The best quality iPad cover I have ever had. And the blue is so pretty!!!! The keyboard synced quickly and has soft keys.
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Reviewed in the United States on April 30, 2026
★★★★★ 4
Great quality case, keyboard doesn’t work as intended
Color: Dark Cherry
Case is fine and good quality but the keyboard doesn’t work as intended. Bluetooth connects great but the keyboard is formatted incorrectly. For example, when I try to use a dash, it puts an apostrophe instead. I have no idea how to reformat it myself. I’d love just a replacement keyboard
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Reviewed in the United States on January 31, 2026
★★★★★ 5
Worth it!
Color: Pink, Color: Pink
Great buy! Worth the money and the color is nice. The keyboard works, some buttons I haven’t figured out but for the most part it’s worth the purchase!
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Reviewed in the United States on May 20, 2026
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