Questions & Answers for: Pontiac Grand Prix error code 99

Question about 1999 Grand Prix

2 Answers

99 GP has been having the same problem off and on since last year and have had it in the shop 3 times, first 2 times at a local automotive repair last week with a Pontiac dealer. Randomly stalls after

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...Error code 118- 99 Pontiac Grand Prix 3.8 V6 171,000 miles:Error code 118- Coolant temperature switch. I bought one at parts store,how and where on the vehicle do I replace it? I'm hoping it might be ...

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...error code on the HVAC display (flashing man) so I think its a mechanical failure rather than a sensor / voltage issue. I plan to fix within the next week. I'll post a follow-up response. It is your ...

...99% OF THE TIME. DO ALL OTHER ELECTRIC THINGS ON CAR WORK , NOT TOLD AT ALL BATTERY IS BAD. AFTER 17 YEARS WE'D BE ON BATTERY #3 NOW. ARE YOU? ITS 4 LUGS RUSTY OR LOOSE OR BOTH, 2 CABLES 4 ENDS ALL 4 ...

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