2001 GMC Yukon Getting code P0332 and P0327.

Tiny
BCMULLEN95
  • MEMBER
  • 2001 GMC YUKON
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 217,000 MILES
I have replaced both knock sensors and the wire harness on my Yukon XL and I am still getting both knock sensor codes while trying to get the monitoring systems to complete for emissions. How can I test the knock sensors and will I have to replace them again. Could rust from the block prevent a complete circuit and cause a faulty reading. The old harness was bad the copper wires in side the insulation appeared burnt. Could that have caused a problem further down the line?
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Friday, August 29th, 2014 AT 6:01 AM

4 Replies

Tiny
HMAC300
  • EXPERT
Ok 332 is the rear sensor and 327 if front if harness is burnt heck connection of new harness and then after the connection check for burnt wires there as damage may have been done there as well as pcm. But if both codes are up it's normally a connection problem. However overtroqueing will cause them as well, set dvom to 400mV ac tap block with a hammer you should get a signal if not sensor may be bad. Knock sensors shold have torque of 20Nm or 15 ft lbs.
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Friday, August 29th, 2014 AT 6:52 AM
Tiny
BCMULLEN95
  • MEMBER
I am getting a signal from both KS, so I will assume I over torqued them and work on it.
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Monday, September 1st, 2014 AT 7:50 AM
Tiny
BCMULLEN95
  • MEMBER
I torqued the KS and now the voltage change for one is real low and the other one has no change. What is the voltage change for the KS, should it be 1 or 2 mv or greater than that? Before I re torqued them the change was 5 or more mv.
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Wednesday, September 3rd, 2014 AT 4:55 PM
Tiny
HMAC300
  • EXPERT
Your DMM has to be set at 400mvAC then tap on the block while attached to ground with one and ks with other as long as you get a signal that tells you the KS is goo if ohms are correct then it 's either a short to ground an open or a short to voltage which also could be poor connections at the pcm. The pcm because of wher they are located does get water intrusion and makes the pcm fail. But a pro should check this out. Because he will have to program it to your vehicle anyhow because of security issues. You have to tap on a metl area of block not plastic. As you have stated you replaced th ks harness it wold be between there and pcm if not the pcm itself
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Wednesday, September 3rd, 2014 AT 5:06 PM

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