: 2009+ CTS-V TSB Sticky Thread

08-10-11, 10:44 PM
#10-04-20-001B: Rear Axle Clunk and/or Chatter Type Noise on Turns (Drain/Refill Rear Differential Fluid) - (Apr 21, 2010)
Subject: Rear Axle Clunk and/or Chatter Type Noise on Turns (Drain/Refill Rear Differential Fluid)

Models: 2003-2010 Cadillac CTS, Sport Wagon (Including V-Series and Export)
2004-2009 Cadillac SRX (Including Export)
2005-2010 Cadillac STS (Including V-Series and Export)
Equipped with Limited Slip Differential (RPO G80)

Some customers may comment on a clunk and/or chatter type noise from the rear of the vehicle while making turns.

This condition may be worse on vehicles built prior to the 2008 model year. Carbon-faced clutch plates were introduced into production in the 2008 model year and have decreased the likelihood of the clutch plate chatter.

This condition may be caused by slip/stick of the posi-traction clutch plates due to insufficient limited-slip axle additive. As plates slip and stick, a jumping or jerking feel occurs accompanied by a clunk noise.

Important: DO NOT remove the differential cover. It is not necessary to flush the old fluid from the differential.

Drain and refill the rear differential with fluid, GM P/N 88862624 (in Canada, 88862625). Refer to the Axle Lubricant Change procedure in SI.

This fluid includes a friction modifier already added with a different formulation that lasts longer and does not break down over time.

Without Differential Oil Cooler
1.10 L
1.16 qt

With Differential Oil Cooler
1.41 L
1.50 qt

Parts Information
Part Number

88862624 (US -1 qt)

08-10-11, 10:45 PM
PIC5136B: Clicking Noise From Front Wheels - (Jun 2, 2010)
Subject: Clicking Noise From Front Wheels
Models: 2009 - 2010 Cadillac CTS-V
This PI was superseded to update wheel part numbers. Please discard PIC5136A.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

A customer may comment on a clicking noise emanating from the front wheels. This condition is noticed at low speed (walking speed) during full wheel lock turns on dry clean pavement (Full lock parking lot maneuver). The clicking noise is generally noted as approximately 1 to 4 "clicks" per wheel revolution. The cause may be interaction between wheel mounting face and wheel mounting surface on rotor.

Complete the procedure below on both front wheels.

Note: It is not necessary to clean the rear wheels for the "clicking" condition.

•Remove the front wheels.
•Clean the rotor top hat as follows.
• 2.1 Use a clean cloth dampened with GM Brake Parts Cleaner 12378556 or equivalent.

• 2.2 Clean the wheel mounting surface of the rotor (rotor top hat). During cleaning process be sure to clean the rotor near the wheel pilot at the center of the rotor.

•Replace the front wheels with the appropriate part number listed below which have a revised mounting surface.
20951880 Painted Wheel

20951881 Polished Wheel

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

08-12-11, 11:45 AM
I have all TSBs up until the beginning of this year. Beyond that, I don't have anything else. The problem is how to even post them... there are so many. Would the customer interest ones be enough? pdf format? Seems like so much work and I don't even have a v2 yet haha.

The Tony Show
08-12-11, 12:16 PM
Several forums, including CadillacFAQ.com, got cease and desist letters for hosting a TSB database. Smaller sites or those that cater to older cars usually get away with it, but considering our size AND the fact that GM has a presence here, it wouldn't go unnoticed for long.

It'll be up to the owner whether or not we make a TSB thread here and run the risk of attracting GM's lawyers.

Lord Cadillac
08-18-11, 12:13 PM
Yeah. Unfortunately, we're not allowed to do this... I need to close this up. Sorry, everyone...