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Sedans Cadillac CTS/CTS-V 2008 Cadillac CTS
2757 messages, Last post on Oct 09, 2009 at 8:13 PM
You are in the Cadillac CTS/CTS-V Forum. Your Hosts are pat & karens
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Replying to: jrcee (Jan 14, 2009 7:02 am) look at this bulletin: #PIP4435B: Phasing Drone Moan Or Vibration At approximately 50MPH Or 1200-1300 RPM - keywords accelerate light throttle - (Sep 5, 2008) Subject: Phasing Drone, Moan, or Vibration at Approximately 50 MPH or 1200-1300 RPM Models: 2008-2009 Cadillac CTS --------------------------------------------------------------------------------- - This PI was superseded to update model years and EVA diagnostics. Please discard PIP4435A. --------------------------------------------------------------------------------- - The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern: Some customers may comment of a boom, moan or vibration during light acceleration which phases in and out in intensity. The condition may be most noticeable at about 50 mph (80 kph), or 1200 - 1300 rpm, and occurs over a speed range of 3 to 5 mph (5 to 8 kph). This condition can be caused by the rear axle assembly responding to frequencies generated by the transmission when the Torque Converter Clutch (TCC) is engaged. Recommendation/Instructions: Perform the procedure in SI Document ID 1578733: "Vibration Analysis - Road Testing". This condition can be identified as a third-order engine disturbance by using the J 38792-A, Electronic Vibration Analyzer (EVA) 2. Verify the concern by duplicating the condition and then commanding the TCC off with the Tech 2. If the condition is verified, it may be reduced or eliminated by indexing the propshaft. Ensure that the rear axle damper is in place and not grounded out. If the damper is in place and indexing the prop shaft does not eliminate the concern do not attempt any further repairs at this time. Engineering is aware of this concern and is developing a repair at this time. Further repair information will be available when a procedure is developed and verified. 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. ### now with all this said..supposedly there is another PIP out stating GM is aware of the problem and working a fix...and to not attempt any repairs..but no one has seen it yet?
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About once every couple of months my CTS has automatically locked its doors. Each time I have noticed this has been in the garage. Well, the other day I was standing by the car as my wife pushed the garage door open button and I saw the doors lock. Periodically there must be a frequency interference. Problem solved. |
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Replying to: pao (Jan 14, 2009 11:25 am)
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Replying to: jrcee (Feb 11, 2009 7:29 pm)
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Replying to: jrcee (Feb 12, 2009 1:42 pm) Are you sure the bulletin number you cite above is accurate? Thanks.
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Replying to: sryn (Feb 16, 2009 9:07 am) Engaged (Reprogram TCM and Install Insulator Washers [On Vehicles Built Without Washers]) - (Feb 11, 2009)
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Replying to: jrcee (Feb 16, 2009 12:03 pm) This bulletin is being revised to update model years and add insulator washers (only for vehicles built without washers). Please discard Corporate Bulletin Number 08-07-30-044 (Section 04 - Driveline/Axle). 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 For All Vehicles -- Calibration Update This condition can be verified by driving the vehicle to duplicate the concern and using the Tech 2® 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/kpg. 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. • DO NOT replace rear drive axle or propshaft for this concern. 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® is updated with the latest software version. For Vehicles Built Prior to VIN Breakpoint 90159377 - Install Insulator Washers After Reprogramming 1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 2. Place a transmission jack stand under the rear differential assembly. 3. Remove the two front differential mounting bolts 4. Install the rubber insulators (2), GM P/N 20827776, between the rear drive axle and the body 5. Install the rear differential mounting bolt. Tighten Tighten the rear differential mounting bolt (1) to 220 N•m(162 lb ft). 6. Remove the transmission jack stand. 7. Remove the support and lower the vehicle. Parts Information Part Number Description Qty 20827776 INSULATOR ASM - DIFF CARR 2 Warranty Information For vehicles repaired under warranty, use: Labor Operation Description Labor Time K9532* Transmission Control Module Transmission Reprogramming with SPS 0.4 hr Add Install Rubber Insulators in Rear Differential 0.3 hr *This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide. GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION © 2009 General Motors Corporation. All rights reserved.
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Replying to: pao (Feb 16, 2009 4:19 pm) |
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I habe an 08 cts major electrical problems been at the dealer now for 23 days, got back car shut down while driving, again im told it will be a while we have alot of issues with the cts, anyone else having issues   
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Replying to: jenton (Mar 14, 2009 7:29 am) |
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