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P1811 Diagnostic Trouble Code Discussion for May 2005

Maximum Adaptive And Long Term Shift

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Trouble Ticket Help Requests for DTC P1811
Help Request Posted
2001 Pontiac Grand Prix SE 3.1L MIL Lamp on VIN: 1G2WK52J91
P1811: Maximum Adaptive & Long Term Shift. ... lost of power in January. Had code PO300. #2 misfire. Cleared codes and test drove o.k. Came back in 2 weeks later, wouldn't go over 25mph. Plugged up cat. Replaced cat. Test drove fine. 2 weeks later came back with check engine light on. Code 420. Cleared...
May 03, 2005