C 3500 Truck 2WD V8-8.1L VIN G (2001)
Neutral Safety Switch: Customer Interest
Neutral Start/Back Up Switch - Short To Ground
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 01-06-04-034
Date: June, 2001
TECHNICAL
Subject:
Engine RPM Limited to 3,000 RPM and No Cruise Control
(Check Wiring and NSBU Switch)
Models:
2001 Chevrolet and GMC C/K Pickup Models (Silverado and Sierra) with 8.1 L Engine (VIN G - RP0 L18) and Allison Automatic Transmission (RP0 -
M74)
Condition
Some owners may comment, that the RPM is limited to 3,000 RPM and the cruise control will not function.
Cause
Circuit 1786 ORN/BLK from the transmission Park/Neutral Start Back-Up (NSBU) switch (pin A of the 7 pin connector) to the PCM (C1 connector pin
34) may be shorted to ground or the NSBU may not be switching correctly and grounding the circuit internally.
