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TOPIC : General Motors


Don’t Trust the Intake

This bulletin applies to all current and previous fuel-injected GM vehicles. When replacing an engine due to internal damage, extreme care must be taken when transferring the intake manifold to the new engine long block.


Beware the Ground

This bulletin applies to 2008-2014 Cadillac CTS vehicles as well as various additional GM vehicles. The purpose of the bulletin is to inform technicians of an issue that could cause internal module damage to the Body Control Module (BCM).


GM O-ring Woes

Some owners of select GM vehicles may comment on a low brake pedal during braking. See the application list at the end of this bulletin.


A Code of No Importance

This bulletin applies to 2011-2014 GM passenger cars and light-duty trucks equipped with OnStar. While diagnosing a vehicle with an OnStar concern, technicians may find DTC B101D-37 in the OnStar module (VCIM).


Pop Goes the Piston

This bulletin was released by Chevrolet, but the warning really applies to a multitude of vehicles. Some customers may complain of an SES light and a constant engine misfire. In some cases, they may also note a tick/knock noise.


Common Sense with Wheel Nuts

Many vehicles are equipped with wheel nuts that feature a stainless steel cap/cladding, such as those used on 2012 and prior GM vehicles. When removing or installing wheel nuts with stainless steel caps, using a shallow socket may crack the cap causing corrosion underneath the cap and nut.


Fuel According to GM

Apparently, General Motors does not endorse, support or acknowledge the need for fuel injector cleaning as a preventive maintenance procedure. According to GM, fuel injector cleaning is approved only when performed as directed by a published GM driveability or DTC diagnostic service procedure.


Air Leak Doesn’t Mean Trouble

Input housing and shaft assemblies from transmissions have been incorrectly considered defective when air bubbles are observed coming from between the input shaft and the housing during an air check.


A Sensible Smoke

This bulletin applies to 2000-2012 GM passenger cars and light-duty trucks equipped with gasoline engines, where the SES light is on and any of the following fuel trim and/or O2 sensor-related codes are stored:


Parking Brake Rotor

GM does not recommend resurfacing of the park brake portion of the rear brake rotor on vehicles that feature rear disc brakes.

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