K 1500 Yukon 4WD V8-5.3L VIN T (2000)
PROM - Programmable Read Only Memory: Customer Interest
Driveline - Vibration/Growl Noise
File In Section: 07 - Transmission/Transaxle
Bulletin No.: 99-07-30-024
Date: October, 1999
TECHNICAL
Subject:
Driveline Vibration/Growl Noise (Reprogram PCM)
Models:
2000 Chevrolet and GMC C/K Utility and Pickup Models (Silverado and Sierra)
with 4.8 L or 5.3 L Engine (VINs V, T - RPOs LR4, LM7)
and Hydra-Matic 4L60-E Transmission (RPO M30)
Condition
Some customers may comment about a driveline vibration/growl noise at speeds between 56-80 km/h (35-50 mph) with low engine speeds.
Cause
Engine torsional vibration when the torque converter clutch is engaged at low engine speeds, 1100-1400 RPM, can excite various driveline components.
These driveline disturbances can cause noises and vibrations that the driver may feel and/or hear.
Correction
Reprogram the Powenrain Control Module (PCM) with the calibrations listed in this bulletin.
Parts Information
The calibrations listed are electronic calibrations and are NOT available from GMSPO. Calibrations will be available from Techline starting October
1999, on the TIS 2000 Disc 21 CD ROM or Techlme CD ROM # 20/21.
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
Description
Labor Time
Use
Published
J6355
PROM Reprogramming
Labor
Operation
Time
