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Sedans Cadillac CTS/CTS-V 2009 CTS
231 messages, Last post on Nov 23, 2009 at 1:06 PM
You are in the Cadillac CTS/CTS-V Forum. Your Hosts are pat & karens
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Replying to: asrose (Feb 18, 2009 7:57 pm) all this seems to be car unique......I have an 09 RWD non-DI model fully loaded otherwise...and have neither problem... picked it up in Sept 08 and have over 10K on it now without any problems...... here is the TSB for the insulators: 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: asrose (Feb 19, 2009 7:51 am) |
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Replying to: asrose (Feb 18, 2009 7:57 pm)
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Replying to: fisherman10 (Feb 19, 2009 3:34 pm) |
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Hey Guys, I just purchased a 2009 CTS AWD 3.6L. Sharp car, but my gas mileage is terrible. 11.2 mpg. Sad I've run through a couple tanks of gas from different stations, but the mpg turns out about the same. I drive about 25 miles a day round trip to work. I've tried to vary my driving style and drive as conservatively as possible with no real change in mpg. My commute is mostly city driving. I just brought it back to the dealer and they said all things check out OK. I have noticed some stuttering in the acceleration. Any thoughts? I also got a rental CTS from the dealer while they looked at my car. It was a 2009 RWD 263hp. This car is a lot peppier then mine and has the mpg on the dash listed as 20.5 mpg. Hmmm? Something seems wrong here. The dealer said I should drive for a couple thousand miles to get a real idea on the mpg. I'm getting 165 to 185 miles to a tank of gas. This will not fly. Do I have a lemon? Any thoughts? Tips? Thanks for any help. best, -S |
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Replying to: blackcadillac (Feb 23, 2009 8:38 am)
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Saying 3.6L is not clear about 304HP DI or 265HP Standard engine. That is mainly interesting to establish a pattern, to determine if any combo of options is related to poor or expected MPG. I feel the best way to measure MPG easily and quickly is to monitor the instant MPG display on cruise, on a Flat highway going around 60 or so. If that gets close to the 25-26 EPA, then nothing is wrong for the highway. If that MPG stinks, then something could be wrong and you will have a better argument with service. Stuttering in acceleration also may indicate something not correct. Don't monitor MPG in "Sport Mode" (shifter to the right). If the 263hp engine felt faster than yours, that is another indication of yours not running well.
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Replying to: joey245 (Feb 19, 2009 7:52 am) |
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Replying to: artmbgolf (Feb 23, 2009 10:32 am) Here are the specifics on my CTS 3.6L Direct Injection All-Wheel Drive V6 engine with 304 hp Transmission, 6-speed automatic transmission. Performance Collection, 18" All-Season Tire Performance Package Yes, the 263HP RWD felt more responsive. I will try the highway 60 MPH test and see if I get the 25-26 EPA. thx, -s
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Replying to: blackcadillac (Feb 23, 2009 7:57 pm) Some reporting normal 27ish mpg and others reporting teens, makes it sound like they have a problem or are calculating wrong or just reporting the computer avg mpg. My current 25 mpg highway often is around 15-17 around town. If cruise or steady at 60-70 mph on flat road isn't up in the mid 20's, you might have a problem, especially considering performance doesn't feel good compared to the 263hp engine. I have not driven the DI yet, so I can't talk about the difference in feel. I also wonder if the Michlen tires on FE2 grip well enough, as they are more of a touring tire than a perf all season. |
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