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Where is the ECM?

Tiny
KELICUT1
  • MEMBER
  • 2001 PONTIAC BONNEVILLE
Where is the ecm / ecu located? Could not find it in engine compartment.
Sunday, March 7th, 2010 AT 5:44 PM

8 Replies

Tiny
ERNEST CLARK
  • MECHANIC
  • 1,730 POSTS
I believe you are looking for the "Powertrain Control Module".

This is located inside of your air-cleaner housing. (Where the air filter is located)

Once you completely remove the air cleaner housing, you'll see it.

Be careful when you disconnect this and install a new one. It's pretty easy to create a shock that will ruin the processor. (Electrostatic discharge)
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Sunday, March 7th, 2010 AT 8:52 PM
Tiny
MJM12345
  • MEMBER
  • 1 POST
  • 2000 PONTIAC BONNEVILLE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
I cannot find the location of the ECM on my 2000 Pontiac Bonneville. I have checked right and left kick plates, under the dash, behind the glove box, behind the ABS computer and other locations. I have followed a large wiring harness under the passenger seat, however, before completely taking apart the interior I would like to know if this is in face where the ecm is located. You guys are great and have some excellent tips and knowledge.
Thank You.
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Thursday, December 17th, 2020 AT 3:57 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
It's in left front of the engine compartment, in the air cleaner housing.
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Thursday, December 17th, 2020 AT 3:57 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Yea they hide the PCM in air cleaner housing
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Thursday, December 17th, 2020 AT 3:57 PM (Merged)
Tiny
STEVEN BRUMFIELD
  • MEMBER
  • 1 POST
  • 1997 PONTIAC BONNEVILLE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 238,569 MILES
Where is the computer brain box located on a 1997 pontiac bonneville because it wont start sometimes if it has been driven a little bit when its warm i, ve heard the 3.8, s have a history of this?
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Thursday, December 17th, 2020 AT 3:57 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hello the PCM or brain box is located at the left front engine compartment. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Thursday, December 17th, 2020 AT 3:57 PM (Merged)
Tiny
MICHAEL SCHEFFLER
  • MEMBER
  • 1 POST
  • 1993 PONTIAC BONNEVILLE
  • 3.8L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 200,000 MILES
Where is the PCM located and what are the color codes for each plug?
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Thursday, December 17th, 2020 AT 3:57 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
There is only one plug as it is OBD1. See picture for location behind right hand side of dash do not forget to take prom out for new ECM.
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Thursday, December 17th, 2020 AT 3:58 PM (Merged)

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