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Note: Click a picture or illustration in the left column to view a large version in the article. To hide the large version, simply click on it. |
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Midtronics PSC 550 Battery Maintainer Now Essential
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-- Being shipped to all dealers in 4th quarter of 2008 TIP: The PSC 550 Maintainer is now the only available maintainer in the GMDE program because it has been determined that hybrid vehicles, along with future models, will require the extra capacity that the PSC 550 Maintainer can provide. Easy to Use - Thanks to Will Godfrey and Russ Dobson |
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2009 Model Year Vehicle Identification Number (VIN) Information
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Refer to bulletin 08-00-89-031. - Thanks to Lisa Scott |
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Crosshatch Appearance |
This information applies to the driven sprocket support assembly p/n 24209098 used in the 4T65E transmission (RPO MN7, M15, M76). - Thanks to Darryl Butler |
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Vibe Automatic Transmission
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On a 2009 Vibe with automatic transmission MVA, MVB, and MVD, a new WS automatic transmission fluid is required. Refer to bulletin 08-07-30-037A for details. Mixing with the old T-IV ATF will cause shifting concerns. |
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Ceramic Brake Rotors
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The ZR1 Corvette is equipped with ceramic brake rotors (fig. 4 and 5), which offer a number of benefits over cast iron rotors: - No fading To prevent damage to the ceramic rotor, install a foam rotor protector before removing any wheel. Protectors can be installed through the spokes of the wheel. There are 10 millimeter threaded holes in the rotor. If necessary, use bolts to slowly push the rotor off of the hub.
Grooves -- If at any time the rotor has contacted the backing plate due to excessively worn pads, the rotor should be replaced.
* Each brake rotor is marked with a unique discard weight. This weight is indicated on the carrier section of the rotor and can vary for each rotor in an axle set. |
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New Greaseless Intermediate Shaft
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The 2009 Malibu, G6 and Aura are being built with new intermediate steering shafts (I-shaft) that do not use grease at the sliding interface (fig. 8). The sliding interface consists of a 10 tooth plastic over-molded male shaft and a 10 tooth female shaft that is painted with a corrosion resistant autophoretic coating. The sliding interface was designed to operate without grease. Applying any type of grease or foreign substance to the sliding interface will significantly degrade the performance of the part. DO NOT APPLY GREASE TO THE INTERMEDIATE STEERING SHAFT SLIDING INTERFACE. A Old shaft |
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Automatic Transmission Overfill
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TIP: Be sure to observe this information when performing PDI or adding fluid after a repair on the affected vehicles (Acadia, Enclave, Outlook, Malibu, Aura, Vue, Equinox, Torrent - Thanks to Henry Steaban |
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Proper Tire Inflation During PDI
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Due to seasonal temperature changes, tire pressures MUST be rechecked at the time of delivery. Refer to Bulletin 07-03-16-004. - Thanks to Brian Bartnick |
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No Crank/No Start
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Some owners of a 2008 Tahoe or Yukon Hybrid with RPO HP2 may experience a no crank/no start condition with DTC U1812 set in the Battery Pack Control Module (BPCM). - Thanks to Paul Radzwilowicz |
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Integral Connector Position Assurance (CPA) Update |
Many connectors used on Supplemental Inflatable Restraint (SIR) inflators are equipped with an integral connector position assurance (CPA). These connectors must be handled properly to ensure proper operation and to avoid damage. A Code number
Removing Connector IMPORTANT: Do not remove the CPA from the connector. If it is removed, it will be damaged (fig. 11) and the connector will have to be replaced. There is no replacement CPA. Order a new pigtail and splice it into the harness. Installing Connector - Thanks to John Roberts
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Electrochromatic
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Owners may comment that the electrochromatic (auto-dimming) outside rearview mirror used on the driver’s side of many GM vehicles is slower to defrost than the passenger side outside rearview mirror. |
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Astra Radio Conditions |
The radio (EHU/Infotainment) of a 2008 Saturn Astra beeps and or the DIS/DIC (Radio Display/Board Computer) displays a message Radio Safe or Display Safe. |
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Skipshift Feature Operation |
G8 Shifting into 4th gear turns off the skipshift feature. After shifting to 4th gear, the transmission may be downshifted to a lower gear if the driver chooses. - Thanks to Chris Graham |
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Some owners of a 2006-09 Corvette Z06 or a 2009 Corvette ZR1 with 6.2L or 7.0L Engine (VINs R, E -- RPOs LS9, LS7) may comment on a rattle or tapping type noise that is heard under the hood just above idle, usually 1200 to 2200 RPM. In some cases, this noise may also be heard on the inside of the vehicle and be more pronounced on the passenger side. A Seal (O-ring) - Thanks to Jamie Parkhurst |
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Engine Oil Pressure MIL |
Some owners of a 2007-08 Silverado or Sierra with 6.6L LMM engine may comment that the engine oil pressure MIL is illuminated. There may be a stored DTC P0522. This concern could be caused by a damaged circuit for the EOP sensor at X108. The 5 volt reference circuit 2705 is a very small gauge circuit with extra length between the back of the connector and the conduit clip, making it prone to damage. |
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Convertible Top Operation |
On a 2006-09 Pontiac G6 convertible,
the convertible top may be slow moving or inoperative after replacement of the hydraulic pump motor. If the hydraulic lines are not pushed all the way into the new hydraulic pump manifold assembly, the ball cock will not be fully depressed. This allows only minimal fluid flow into the lines. |
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Power Liftgate Inoperative |
On a 2008 Enclave, Acadia or Outlook, the power liftgate may be inoperative if the power liftgate strut rod retaining clip is not properly oriented. This may happen if the ball socket of the strut rod was not properly machined (socket may not be deep enough) (fig. 16). This can prevent the retaining clip from fully seating, which could allow the strut rod to disconnect at the motor actuator arm. Do not replace the power liftgate motor assembly for this concern. |
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Engine Oil Leak
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Some owners of a 2007-09 fullsize pickup, utililty or van equipped with 4.8L, 5.3L, 6.0L or 6.2L V8 engine (VINs C, M, L, J, 4, 0, 3, 5, K, Y, 8 or 2 -- RPOs LY2, LH6, LY5, LMF, LMG, LC9, LFA, LY6, L76, L92 or L9H) and Engine Oil Cooler System (RPO KC4) may comment on an engine oil leak. You may find fluid leaking from the engine oil cooler pipe to oil pan connection. The leak may be caused by oil pan casting porosity at the engine oil cooler bolt cavity. |
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Know-How Broadcasts for December
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