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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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4.5 ★★★★★
Based on 23 reviews
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Product Reviews
★★★★★ 4
it is good quality
Color: Black, Size: Medium
this is very sleek and handy. I like how it looks and sits on the counter. One thought the part the holds the dish cloth falls off when I take the dish cloth off. It is a minor issue, however, if there was a way to clip it more secure to the item, this would be ideal. thank yoo
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Reviewed in the United States on May 2, 2026
★★★★★ 5
Most importantly, its drainage system directs water into the tank, keeping it dry.
Color: Black, Size: Medium
This drain rack is small and fits perfectly on the edge of my sink. It's just the right size to hold hand soap and dishcloths, doesn't take up much space, and most importantly, it directs water directly into the sink, keeping it dry and keeping my sink clean and tidy.
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Reviewed in the United States on April 5, 2026
★★★★★ 5
Good product
Color: Black, Size: Medium
It is as described, looks neat and tidy on the sink. Just big enough to do what I need it to do. My sink stays dry because the wate goes back int the sink.
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Reviewed in the United States on February 14, 2026
★★★★★ 5
Quality is good.
Color: Black, Size: Medium
A product that works as promised.
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Reviewed in the United States on May 17, 2026
★★★★★ 3
It is almost great.
Color: Black, Size: Medium
It is a nice sponge holder but the tray is not wide enough and it falls. Because it was the only one I found with a spout, I am keeping it, and figured a way to stick it so the tray doesn't fall. The other thing is that the tray is not sunken enough in the middle for all the water to be routed there, and the spout doesn't always get rid of all the water inside, so once in a few days, I have to manually press it down and more water comes out.
The dishcloth rack is not great for cloths, they get wet.
Other than that, it looks very nice, it is aesthetic, big enough for all my kitchen stuff, and makes my kitchen neater, so I like it.
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Reviewed in the United States on January 17, 2026