1999 Chevy Tahoe Crankshaft sensor code problem

Tiny
PWSHEPARD
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
A couple of months earlier, my Tahoe set a Crankshaft Position sensor code. I replaced the sensor, which did not fix the problem. The actual problem was that the wiring harness to the sensor had several burned wires that were laying against the exhaust manifold. I repaired the wires and life seemed to be back to normal. The truck had been running fine until two days ago. The truck started acting the exact same way. It is cutting out, spitting and sputtering and struggles to keep running when at idle. It set the same Crankshaft Position sensor code and also set a Camshaft Position sensor code. Since that point, I have done the following: 1. Replaced the Crankshaft sensor 2. Replaced the fuel pump in the gas tank 3. Replaced the fuel filter 4. Replaced the ignition module (I believe that's the correct name.) It's located just to the left of the throttle body. None of these have seemed to make an improvement at all. As of tonight, I am planning on rebuilding the portion of the wiring harness I repaired a few months earlier, thinking that maybe I missed a bad portion of the wire. If that doesn't help, I'm planning on having the ECM tested. Please let me know what you think as this problem has definitely got me and my local shade tree mechanic stumped. Thanks.
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Wednesday, December 2nd, 2009 AT 12:58 PM

7 Replies

Tiny
DOCFIXIT
  • EXPERT
Would you post codes that would help as there are a few of each for CKP andCMP
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Wednesday, December 2nd, 2009 AT 1:12 PM
Tiny
PWSHEPARD
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Here are the codes that were set.
1. P0340
2. P0341

The first code appears more often than the second. But it is not constant, meaning that I can clear the code and let the engine run for several minutes before it throws the code again. Thanks.
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Wednesday, December 2nd, 2009 AT 2:36 PM
Tiny
DOCFIXIT
  • EXPERT
Both codes diagnostic concerns are with wiring. So your thought to reckeck wiring is good. One thing about wiring in computer controled any splice, butt conector cannot be used. They may work for awile but resistence builds and code sets. Silver soilder will work but harness replacement is the way to go. If you where in my shop that's the way I would go.
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Wednesday, December 2nd, 2009 AT 3:05 PM
Tiny
PWSHEPARD
  • MEMBER
Can you point me to website online where I can purchase a replacement wiring harness?
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Wednesday, December 2nd, 2009 AT 3:39 PM
Tiny
DOCFIXIT
  • EXPERT
Cheapest way cause I think it is only the crank sensor is to replace the Yellow and purple wires from crank to PCM. Cut wire about 6 in. From crank sensor and PCM install new wire think 22 Ga. Use soilder connectors Radio Shack has and silver soilder. Then heat shrink tube over repair. That should do it wiring is dealer and have to buy entire engine control harness mega $$$. GM won't sell partial
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Wednesday, December 2nd, 2009 AT 4:21 PM
Tiny
PWSHEPARD
  • MEMBER
Just finished replacing the wire a couple of hours ago, so far so good. Thanks for the advice.
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Wednesday, December 2nd, 2009 AT 9:18 PM
Tiny
DOCFIXIT
  • EXPERT
I'll keep my fingers crossed
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Thursday, December 3rd, 2009 AT 9:16 AM

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