1999 GMC C1500 Trouble Code P1345

Tiny
FITHGEAR
  • MEMBER
  • 1999 GMC C1500
  • V8
  • 2WD
  • AUTOMATIC
  • 192,000 MILES
I recently had both heads (cracked) changed on my truck because of overheating due to complete loss of coolant. After the work was completed the person that did the work told me that I needed to change the Crankshaft Positioning Sensor due to a code and the Check Engine Light was on. I changed the Sensor and cleared the code but the check engine light came back on within seconds. My Haynes Repair Manual says that you must do a "Crankshaft Position Sensor Variation Learning Procedure". Can this be done by me or do I have to take it to a dealer? If I can do it, how is it done.
Wednesday, January 23rd, 2008 AT 5:57 PM

3 Replies

Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS
It can only be releared with a scan tool. You can take it to the dealer. They just use a tech 2 and relearn it. Takes about 15-20 min to do. No other way to do it.
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Thursday, January 24th, 2008 AT 7:45 PM
Tiny
FITHGEAR
  • MEMBER
  • 5 POSTS
Thank you, that is the information I needed.
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Friday, January 25th, 2008 AT 10:45 AM
Tiny
FITHGEAR
  • MEMBER
  • 5 POSTS
Well I took the truck to the dealer for the Crankshaft Position Sensor Variance Learning Procedure and the code was back before I even got off the lot. Since I bought the Crankshaft Sensor from an auto parts store and not form the dealer they could not guarantee that the procedure would work. It didn't. I am affraid that the auto parts store sold me the wrong crankshaft position sensor. From my readings in the Haynes Manual, it should be about.050 from the crankshaft. It has marks on it like it has been rubbing. Since the sensor cost $60 at the auto parts store and is $90 from the dealer, I would hate to change it again and that not fix the problem. What should I do. On the bright side, the dealer did not charge me for the procedure. The truck runs, but has some hesitation and misses and has stalled while driving early on but has not stalled for several weeks, just some slight misses. Any suggestions are appreciated.
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Tuesday, January 29th, 2008 AT 7:07 PM

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