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Cadillac CTS 3.6DI 2009, Black Raven
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Driveability Concerns - Rough Idle, Hesitation After Cold Start

TECHNICAL

Bulletin No.: 08-06-04-051

Date: November 10, 2008

Subject:
Driveability Concerns - Rough Idle, Hesitation After Cold Start (Reprogram ECM)

Models:
2008 Cadillac CTS, SRX

Equipped with 3.6L Engine (VIN Code 7 - RPO LY7)

Condition

Some customers may comment on a rough idle, hesitation or other driveability concerns after a cold start.

Cause

Engineering has identified a concern with the ECM software.

Correction

A revised calibration has been developed to correct this condition. Technicians are to reprogram the engine control module (ECM) using SPS with the latest software available on TIS2WEB. Refer to the Service Programming System (SPS) procedures in SI. As always make sure your Tech 2(R) is updated with the latest software version.


A/T Controls - Droan/Boom/Moan At 50 MPH

TECHNICAL

Bulletin No.: 08-07-30-044

Date: October 16, 2008

Subject:
Phasing Drone, Boom, Moan or Vibration at 80 km/h (50 mph) or 1000-1300 RPM with Torque Converter Clutch (TCC) Engaged (Reprogram TCM)

Models:
2008 Cadillac CTS

with 6L50 Automatic Transmission (RPO MYB)

Condition

Some customers may comment on a drone, boom, moan or vibration during light acceleration which phases in and out in intensity. The condition may be most noticeable at about 80 km/h (50 mph), or 1000 - 1300 engine RPM, and occurs over a speed range of 5 to 8 km/h (3 to 5 mph).

Cause

This condition may be caused by the rear axle assembly responding to engine firing frequencies passed through the driveline when the torque converter clutch (TCC) is engaged.

Correction

This condition can be verified by driving the vehicle to duplicate the concern and using the Tech 2(R) to turn off the TCC. If the noise stops when the TCC is turned off, the calibration detailed below should help to eliminate the noise or vibration.

Important: ^ This calibration may result in decreased fuel economy up to approximately one MPG. Because of this the software should not be used in a vehicle without this concern.

^ There are two calibration part numbers that are "selectable" for this controller. Read the description to determine the correct calibration for this condition.


A revised calibration has been developed to correct this condition. Technicians are to reprogram the transmission control module (TCM) using SPS with the latest software available on TIS2WEB. Refer to the Service Programming System (SPS) procedures in SI. As always make sure your Tech 2(R) is updated with the latest software version.
 
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