Possible fried PCM

Tiny
PCDJ64
  • MEMBER
  • 2006 LINCOLN TOWN CAR
  • 4.6L
  • V8
  • RWD
  • AUTOMATIC
  • 367,000 MILES
I believe I may have a fried PCM. The car ran great with no check engine light.
wrench light came on and then check engine light. I get rpm's in park if I step on pedal but it does not go above an idle in reverse or any forward gear.

these codes came up.
PO 135, 155, 403, 443, 446, 743, 755, 962.

the transmission shifted fine and the car had a lot of power before the issue with the light.

i found a bare wire that hit and caused a spark near the PCM, the wire has since been repaired. But now I cannot move the car, the wire goes to one of the plugs on the PCM.
prior to this there were no codes at all.
Tuesday, October 18th, 2016 AT 3:12 PM

3 Replies

Tiny
JIS001
  • MECHANIC
  • 3,411 POSTS
Check your air conditioner clutch fuse again. F21 15 AMPS. That wire is spliced too the
EGR, Heated oxygen sensors, and transmission control. Hopefully that is the problem.
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Tuesday, October 18th, 2016 AT 3:37 PM
Tiny
PCDJ64
  • MEMBER
  • 127 POSTS
Thank you, that was the problem. I replaced a blown #21, erased the codes and now no more light and it runs back to normal again.
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Tuesday, October 18th, 2016 AT 4:05 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
Glad we could get it fixed please use 2CarPros. Com anytime we are here to help.

JIS001 is one of our best mechanics!

Best, Ken
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Wednesday, October 19th, 2016 AT 9:48 PM

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