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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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4
Ben (Clarksville tn) | March 12th, 2011
This is a great product works great it is the same thing as the dealer 250 dollar part just a better price
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Questions and Answers
Would this cause a no start condition?
View Staff Answer
Answer
Yes, a no start condition is a symptom of a bad NSBU switch. (Check you truck for codes and see where this leads you...could be a bad NSBU)
Fuel economy can vary based on driving conditions, vehicle loads, and driving habits. Most users that don’t’ tow, or tow light loads infrequently, report that they get the best fuel mileage on the higher HP settings. The best way to determine the optimum fuel economy for your vehicle and driving conditions is to try each setting.
Would this caused range shift inhibited?
View Staff Answer
Answer
A service engine light message that reads "shift range inhibited" is a sign of a bad NSBU switch.
Signs and symptoms of a bad NSBU switch also include (but are not limited to):
No Start
Codes: P0700, P0708, P0847, P0872, P0875, P1711 & P1713
PRNDL (Park, Reverse, Neutral, Drive, Low) not displaying on dash
Engagement issues with the transmission
You may have to go over all of your connections and be sure the NSBU remains in the neutral position. The metal clip (neutral assurance bracket) on the switch helps to ensure the switch is properly aligned to the shaft.
Is this a genuine Allison part?
View Staff Answer
Answer
Yes, this is a 100% genuine Allison item.
Yes, this is a 100% genuine Allison item.
Is this for a 5 speed automatic trans?
View Staff Answer
Answer
Yes, the Allison NSBU (Neutral Start Back Up) Switch 29540479 is the direct OEM replacement of the NSBU switch found on all Automatic 01-04 GM 6.6L Duramax applications. (You can verify the part number on your truck along with the Allison part number [29540479] of this item.)
The Allison NSBU (Neutral Start Back Up) Switch 29540479 is the direct OEM replacement of the NSBU switch found on all Automatic 01-04 GM 6.6L Duramax applications. (You can verify the part number on your truck along with the Allison part number [29540479] of this item.)
The Allison NSBU (Neutral Start Back Up) Switch 29540479 is Brand New and comes with a 1 year warranty.
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