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Discussion Starter · #1 ·
2002 lb7 stock 305k

I have had a steady diet of starting my truck with my SES light on after doing so, reading po700 and po708. So after reading multiple posts, I decided on replacing the NSBU switch with a allison replacement. Well after doing so yesterday, the light came on this afternoon, and has repeatedly got worse. Lighting on the shift indicator are symptoms. Hard shift into gear is another symptom. I did pressure wash the undercarriage about 5 days ago when this started. The old NSBU has pounds of dirt and mud behind it..

The last time I replaced the spin on filter was in January when I serviced the transmission.

Question: Is this purely electrical?
 
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