1994 Pontiac Bonneville transmission trouble codes 640 &

Tiny
ANOTHERCHANCEAUTO
  • MEMBER
  • 1994 PONTIAC BONNEVILLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 11,600 MILES
I get these codes from my snapon MT2500 scanner what do they mean?
Monday, June 30th, 2008 AT 9:30 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Well for 96 and newer it means the intake air heater control circuit has a problem, you have a 94? Test by crossing A & B terminals and count the flashes...640 is not a good code!


https://www.2carpros.com/forum/automotive_pictures/62217_GM_DLC95_Older_14.jpg


Cross these two terminals as shown, then turn the key on. Count the flashes, a 22 will flash as 2 flashes then a short pause, then 2 flashes, if more than one code is stored, the pause will be longer. The codes will display three times and end with 12. Write them down and post here. This connector is right under the middle of the dash...
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Monday, June 30th, 2008 AT 9:40 AM

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