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U2109 Diagnostic Trouble Code Discussion for July 2013

Lost communication with powertrain control system


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Trouble Ticket Help Requests for DTC U2109
Help Request Posted
2006 Pontiac G6 GT 3.5L No Start VIN: 1G2ZH55856
U2109: Lost communication with powertrain control system. ... with the engine knocking and banging like real bad and oil all over the bottom end. Long story short, owner overfilled engine with approx 1 to 1.5 gallons of oil. Customer wanted a used engine, so we got one with about 47k miles and installed it. Kept the...
July 19, 2013
2006 Pontiac G6 GT 3.5L No Start VIN: 1G2ZH55856
U2109: Lost communication with powertrain control system. ... with the engine knocking and banging like real bad and oil all over the bottom end. Long story short, owner overfilled engine with approx 1 to 1.5 gallons of oil. Customer wanted a used engine, so we got one with about 47k miles and installed it. Kept the...
July 19, 2013