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P1620 Diagnostic Trouble Code Discussion for September 2008

Low Engine Coolant Switch Circuit Low Input

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Trouble Ticket Help Requests for DTC P1620
Help Request Posted
1994 Pontiac Bonneville SSE 3.8L No Start, Cuts out, Stall, Poor Fuel Economy VIN: 1G2HZ5216R
P1620: qdm4 fault. Good morning guys, and apologies for the long post here. It's been awhile since I've needed to ask for help here, but i have this stumper. the car came to me, with the complaint of stalling "violently", and then sometimes not re-starting. I had the c...
September 30, 2008