Vehicle Jerking Motion at Speed of 113 km/h or 70 mph (Reprogram PCM for Correct Speedometer Calibration)

Important: "IPC" dealers are not authorized to utilize this service bulletin.

Some customers may comment on a jerking sensation when the vehicle reaches 113 km/h (70 mph).

Special Equipment Option (SEO) 9B9, available only to fleets, was intended to limit the vehicle speed at 113 km/h (70 mph) through a mechanical road speed governor. However, for 2001 models, the speedometer calibration incorrectly shuts the fuel off at 113 km/h (70 mph) prior to the mechanical governor engaging. This abrupt fuel shut-off/on may cause the vehicle to jerk.

The powertrain control module (PCM) must be reprogrammed with a calibration that does not include the 113 km/h (70 mph) limit. The new calibration will instead allow the road speed governor to smoothly limit the speed to 113 km/h (70 mph).

Reprogram the PCM with the appropriate calibration from the table below.

The calibrations listed are electronic calibrations and are NOT available from GMSPO. Program the PCM with calibrations found on TIS 2000 data version 5 for 2001 or later, using the following procedure:

1. Call the Techline Customer Support Center (TCSC) at 1-800-828-6860 (English) or 1-800-503-3222 (French).
2. Inform the TCSC representative that you need programming assistance per Service Bulletin Number 01-06-04-041. When you call, you will need the full 17-digit vehicle identification number (VIN) and the new calibration number from the table below.

The TCSC will provide you with a vehicle configuration index (VCI) number to be used for programming the PCM and instructions for its use. THIS NUMBER IS UNIQUE TO THE VEHICLE BEING PROGRAMMED AND CANNOT BE USED ON MULTIPLE VEHICLES.

For vehicles repaired under warranty, use: