Contamination

Diesel Fuel System Contamination, Malfunction Indicator Lamp (MIL) Illuminated – DTC P026D, P2A00, P0171, P0172 and/or P0300 Set – 2017-2023 Cadillac Chevrolet GMC

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Chevrolet GMC Cadillac

NHTSA ID Number: 10222658 Manufacturer Communication Number: 18-NA-361 Summary This technical bulletin provides a procedure to flush the cooler lines to validate if there is excessive debris in the fuel system caused by a failed part.   Condition Some customers may comment that the MIL is illuminated.   Note: If removing the fuel filter from the filter … Read more

Diagnostic Tip – Diesel Exhaust Fluid System Contamination – 2010-2023 Chevrolet & GMC

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Chevrolet GMC Cadillac

NHTSA ID Number: 10222781 Manufacturer Communication Number: 19-NA-237 Summary This informational bulletin explains how to identify possible DEF contamination.   Condition Some customers may comment on one or more of the following conditions: Exhaust fluid quality poor message on the Driver Information Center (DIC). Diesel exhaust fluid warning lamp on. Other exhaust fluid quality related concerns.   … Read more

Cooling System Contaminated With Engine Oil – 2010-2021 Buick Cadillac Chevrolet GMC

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2020 Buick Enclave

NHTSA ID Number: 10198879 Manufacturer Communication Number: 21NA108   Summary This service bulletin provides diagnostic information for the technician regarding a customer concern of engine overheating, cooling system contaminated with engine oil.     Condition Engine is overheating. One or more of the following conditions: Oil in the coolant overflow reservoir Coolant discharging from the coolant reservoir … Read more