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2001 Other GMC Models GMC C6500

Tiny
SV
  • MEMBER
  • 2001 GMC
2001 Other GMC Models Two Wheel Drive Automatic

I have a 2001 GMC C6500 with 3 issues. Are they related?
1) Engine dies occasionally for no apparant reason. Engine light came on once, I tested code which read PO335, cranckshaft sencor circuit malfunction. Reset light and it hasn't come back on, but truck has died. Starts again after sitting 2 or 3 minutes.
2) Automatic transmission hard shifts up and down.
3) Installed trailer brake assist and can't get consistant voltage through stoplamp wire (white wire). Sometime hot, sometimes not.

Number 3 seems obviously electrical/wiring related. Could they all be related?

SV
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Friday, August 22nd, 2008 AT 4:09 PM

2 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Did all the problems start when you wired the trailer?
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Sunday, August 24th, 2008 AT 7:28 AM
Tiny
SV
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The hard shift has been there all along. The engine had stalled once before the trailer was wired, but is continuous problem since.
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Sunday, August 24th, 2008 AT 3:39 PM

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