Question about 1999 Pontiac Grand Prix

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99 pontiac grand prix 3.8 l.No battery power to pcm

99 pontiac grand prix 3.8 l A/T.No battery power to the ''hot at all times''red wires at pcm.also no power or codes at data connector.vehicle still runs. Haynes manual wiring diagrams are inadequate.

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  • lizbosco Aug 09, 2009

    Check engine light on and no power at the data connector.
    Thanks,that nugget of knowlege was very helpful.

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  • 462 Answers

Pin 20 on the blue pcm connector is the power wire to the pcm it is an orange wire. (hot at all times). The power to the data link connection is the cig fuse in the i/p fuse box.

What is the exact problem you are having?

Posted on Aug 04, 2009

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Posted on Jan 02, 2017

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starter is located on the engine block down below.

Removal & Installation To Remove:
Before servicing the vehicle, refer to the precautions in the beginning of this section.
  1. Remove or disconnect the following:
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    • Radiator lower air deflector
    • Torque converter cover
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Starter removal/installation – 3.1L & 3.4L engines 9306zg15.gif

Starter removal/installation -3.8L engine 9306zg17.gif

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1 Answer

99 pontiac grand prix smells hot after driving 30 minutes


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