Bad PCM?

Tiny
AMYW1969
  • MEMBER
  • 2013 KIA SORENTO
  • 4WD
  • AUTOMATIC
  • 116,000 MILES
The 4wd warning light comes on. The car drives fine when this happens, except for rpm staying at zero. It will return to normal once I stop and turn the car off and on. Had Kia Dealer check out with their computer diagnosing equipment and they can't find anything wrong. Bought the car used three weeks ago. This has happened just three times.
Tuesday, September 24th, 2019 AT 5:41 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,645 POSTS
Hello,

This is telling me you may have a bad PCM because of the reset. Also the dealers computer would not see it being bad because it is good at the time. (There is not history code for a bad PCM) Here are the instructions for the replacement in the diagrams below. You will need a rebuilt unit which you can find by searching you will need your VIN number so they can program the PCM before installation. Check out the diagrams (below). Please let us know what happens.
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Wednesday, September 25th, 2019 AT 12:18 PM
Tiny
AMYW1969
  • MEMBER
  • 4 POSTS
Thanks! I will look into this. Appreciate the advise!
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Thursday, September 26th, 2019 AT 2:47 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,645 POSTS
Please let us know what you find. We are interested to see what it is.
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Friday, September 27th, 2019 AT 4:38 PM
Tiny
AMYW1969
  • MEMBER
  • 4 POSTS
Do you think it's worth restarting computer by unplugging battery and removing fuse? Also, Kia dealership said there might be a fault in the crank position sensor. Is this related to PCM? Just want to research before I spend money to repair.
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Saturday, September 28th, 2019 AT 6:18 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,645 POSTS
Yes you can try that to see what happens. It could be the crankshaft sensor that is causing it here is the location. Check out the diagrams (below). Please let us know what happens.
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Sunday, September 29th, 2019 AT 10:13 AM
Tiny
AMYW1969
  • MEMBER
  • 4 POSTS
Decided to have the crankshaft sensor repaired. I'm not a mechanic but found someone to do it for $250.00. They are 90% sure that's what's wrong.
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Saturday, October 5th, 2019 AT 8:09 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Sounds great. Please let us know how it turns out and how we can assist further. Thanks
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Tuesday, October 8th, 2019 AT 2:49 PM

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The au­to­mo­tive en­gine com­puter, also known as the ECU, PCM or ECM (En­gine con­trol unit, Pow­er­train con­trol mod­ule, En­gine con­trol mod­ule), is cen­tral to a ve­hi­cle’s ...
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