Question about 1999 Chevrolet Silverado 1500

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I have a 1998 Z71 with rough idle, I have replaced the crank sensor, distributor, coil,plugs, plug wires and still have code P1345. what can it be?

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  • Jimmy Dec 18, 2012

    I read somewhere that on the 97 or 98 + z71's when ever u replace the crank position sensor you need to do a crank to cam corrilation relearn using the pcm and a scan tool. There may be something in the field service manual about how to do it without the scan tool but I am unclear on that. Hopefully this helps u in some way Have fun and stay dirty.

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  • Master
  • 610 Answers

First thing i would do, is listen to all of my injectors with a stethoscope. If any sound different, then start there, however you hould have checked compression when your plugs were out. Pull them and check compression.

Posted on Mar 23, 2011

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1998 gmc z71 surges in drive p1345


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Trouble code 1345 crank sensor/camshaft sensor correlation


I had this same P1345 code on my 1998 GMC K1500 5.7 for about 2 years. Each time the code was erased, the "Service Engine Light" came right back on with the same code. I tried replacing the cam sensor, but that didn't solve it. I had the timing adjusted, it was out -13 degrees. After adjustment, the "Service Engine Light" went off, but only for a short time. Adjusting the timing is just a temporary mask on fixing the real problem and eventually you will run out of adjustment. I read about this same problem on another forum and someone recommended changing the distributor gear. So I checked the gear and a the teeth were worn. Replaced the gear ($35 part), readjusted the timing and the light has been off ever since. Apparently the gears in 96-99 are soft and wear enough to throw off the timing. This code is telling you the crank and distributor are out of sync. So before you start buying sensors and other misc. parts, try the distributor gear if you are getting a P1345 code.

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