Malfunction Indicator Lamp (MIL) Illuminated – DTC P026A Set – 2017-2023 Chevrolet Silverado & GMC Sierra

2023 Chevrolet Silverado

NHTSA ID Number: 10222655 Manufacturer Communication Number: 18-NA-011 Summary Informational bulletin explaining how a plow may cause overheating and engine damage when traveling over 45 mph.   Condition Some customers may comment that the MIL is illuminated Some technicians may find DTC P026A set on vehicles with a snow plow installed.   Information Note: When a snow … Read more

Identify Engine Misfiring and/or Malfunction Indicator Lamp (MIL) Illuminated – DTC P0300 Setting – 2017-2023 Chevrolet Silverado & GMC Sierra

2023 Chevrolet Silverado

NHTSA ID Number: 10222659 Manufacturer Communication Number: 19-NA-187 Summary This bulletin provides additional information on how to graph a cylinder misfire and a possible diagnostic cause.   Condition Some customers may comment on one or more of the following conditions: MIL illuminated Engine misfire Some technicians may find DTC P0300 set in the Engine Control Module (ECM). … Read more

Engine Coolant Reservoir Overfilled With Discolored Coolant Possible Engine Overheat Transmission Shake Shudder Vibration Shift Performance Or Slipping – 2021-2022 Cadillac Chevrolet GMC

Chevrolet GMC Cadillac

NHTSA ID Number: 10226385 Manufacturer Communication Number: PIP5845A Summary This Preliminary information communicates to the dealer technician that if the vehicle’s engine coolant reservoir has transmission fluid in it or if Glycol it found in the transmission fluid the dealer should replace the Automatic Transmission Fluid Cooling Exchanger. The dealer should refer to bulletin 08-07-30-035 for the recommended components … Read more

Possible Tick or Rattle Noise Concern from Left and/or Right Side Rocker Cover – 2022 Cadillac Chevrolet GMC

Chevrolet GMC Cadillac

NHTSA ID Number: 10222798 Manufacturer Communication Number: 22-NA-060 Summary This informational bulletin provides a procedure to install an isolator over the valve cover if found missing and corrects the customers concern.   Condition Some customers may comment that they hear a tick or rattle type noise coming from the engine compartment – This noise may be noticeable … Read more

LZ0 Powered Vehicles Shipped with an Extra Quart of Oil – 2023 Chevrolet Silverado & GMC Sierra 1500

2023 Chevrolet Silverado 1500

NHTSA ID Number: 10222836 Manufacturer Communication Number: 22-NA-192 Summary This informational bulletin advises the tech on how to check the oil on the new vehicles.   Information 2023 LZ0 powered vehicles are being shipped with an extra quart of oil in the crankcase. This extra oil is only required for the first factory fill. – Do not … Read more