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272.17
Part #: AT29540479
Allison 29540479 NSBU (Neutral Start Back Up) Switch
Vehicle Fitment:
2001-2004 GM 6.6L Duramax LB7 (Must Verify Your Existing Switch) | See full application list below
2001-2004 GM 6.6L Duramax LB7 (Must Verify Your Existing Switch) | See full application list below
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Description
The Allison 29540479 NSBU (Neutral Start Back Up) Switch is an OEM replacement for the faulty NSBU switch in your 2001-2004 GM 6.6L Duramax LB7. Mounted on the transmission housing, the NSBU switch provides selector position information to the TCM. This switch detects the position of the shift lever and communicates to the TCM that the vehicle is in Neutral or Park so that starter can engage. The NSBU switch is known to fail, leading to issues like: no start condition, DTCs for the pressure switch, fail safe mode and incorrect gear showing on display.
Features:
- Dual Connector Switch
- Genuine OEM Replacement
- Installed With Common Hand Tools
Note: Please visually verify the switch on your transmission has the dual connectors before ordering.
Specifications
- MPN 29540479
- SKU AT29540479
- ID 5214
- Manufacturer Name Allison Transmission
- Shipping Weight 2.00 lb.
- Shipping Length 4 in.
- Shipping Width 11 in.
- Shipping Height 4 in.
- Fuel Type Diesel
-
Prop 65
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
- Internal L1.00R1.00
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Reviews
★★★★★
5.0/5 Stars out of 4 Reviews
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CBark (Utah) | September 1st, 2021
Swapped this part in 2015, fixed my problem of “range shift inhibited” and been working great since. Couldn’t find the order number but invoice was 951250A
Brendan (Arkansas) | March 19th, 2021
Truck would clunk into park with no line under P. Truck would sometimes not start in Park. Replaced NSBU from XDP and all is well. Thanks for providing the diesel community with quality parts.
Carl (Oklahoma) | February 20th, 2021
Truck would bang into reverse and shift light would only show 3rd gear ..before wasting money at a trans shop guys..read the forums and replace this.the hardest part was the plug ..carefully use a small pry tool around the edge as you pull it apart . Trans now shifts perfectly...thanks guys for your help
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Questions and Answers
Is this also for an 8.1L gas? Will this fit on a 2001 Chev Silverado 2500HD 8.1L gas allison?
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Answer
Yes, this NSBU switch should also work in the 8.1L gas application. Please check to ensure your vehicle requires an Allison 29540479 NSBU before ordering.
Does the switch kit come with shields?
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Answer
Yes, the ALLISON NSBU (NEUTRAL START BACK UP) SWITCH 29540479 will include the shield as seen pictured.
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