2000 Pontiac Grand Prix Service Engine Light

Tiny
DRAKO
  • MEMBER
  • 2000 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 170,000 MILES
I had my service engine light come on. I hooked up the snap on scanner to the obd 2. It would not let me into the ECM. I replaced my computer and the light went off for about 6 months. Then it happened again. I thought I had a bad computer. So I got another one. It lasted 3 months. Im going to get another one. But on the second one when I replaced it I still could not get into the ECM with the obd 2. Before I replace this one is there anything that you know off that I can check
Tuesday, January 19th, 2010 AT 11:25 AM

1 Reply

Tiny
ERNEST CLARK
  • MECHANIC
  • 1,730 POSTS
There's no way you should be replacing computers like that.

If the scanner couldn't access the computer, either the scanner was faulty, the OBD II port is damaged, or your wiring harness/connectors are broken, corroded or shorted. (Even a bad computer will show up on a scanner)

Instead of replacing the computer, take it out and have it tested. If it checks out, then it's probably your wiring harness.

Also, check you vehicle's ground. (Battery to engine/frame)
Was this
answer
helpful?
Yes
No
Friday, January 22nd, 2010 AT 8:12 AM

Please login or register to post a reply.

Related Check Engine Light Content

Is it Safe to Drive Check Engine Light?
VIDEO
Is it Safe to Drive Check Engine Light?
Instructional repair video
Check Engine Light
GUIDE
Check Engine Light
Why is my check engine or service engine soon turned on? In this guide we talk about what this is associated with this notorious light, what it is used for and what you...
VIEW MORE