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Old November 16th, 2011, 05:59 PM   #1
BlackBetty97
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05 Silverado 5.3 Knock Sensor Issue

Well, issue began with a CEL and a code for a bad number 2 knock sensor on an 05 Silverado with a 5.3. I changed out both knock sensors (only wanted to do the job once) and the single wire harness. During installation I torqued the new knock sensors, applied electrical corrosion protection to the wire connection and insured the wires were connected properly. I followed up by applying a bead of silicone around the top of the recess for the knock sensors and installed the plug's that "keep moisture out."

After completing the repair I cleared the fault codes and drove the ~20 miles home. Truck ran great and did not throw a CEL till the following morning, again for the #2 knock sensor. Cleared the code again to see if the issue would replicate it self and it did in the same series of events.

My question: Are there other causes that may attribute to a CEL with a code for the knock sensor without setting another code? If there are any GM tech's, perhaps an ohm reading for a good sensor and the amperage reading for the single wire connection?

I am kind of at a loss and trying to track down other issues before pulling the intake manifold off again.
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Old November 16th, 2011, 06:05 PM   #2
jbsjunk
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I've gotten new knock sensor harness from the dealer when I do them. Almost without fail the front sensor is nice and clean and the back is rusted out. Haven't had any come back with issues in 3 years.
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Old November 16th, 2011, 06:13 PM   #3
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Yes...the code is only a reference point to start with diagnostics. What did you do to diagnose the code?
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Old November 16th, 2011, 06:47 PM   #4
BlackBetty97
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To diagnose the code I stopped at the GM dealer to see if they could help me out with reading the codes. The tech who grabbed the Tech 2 and ran the scan told me that the issue was a knock sensor.

As usual, the front sensor appeared brand new, the rear sensor was rusted and water had completely filled the recess, the wire for the rear sensor was corroded. I did replace the wire harness.

I am a Class 8 Diesel Mechanic, I am good with Electronic Diesel engines, I don't have access to the fancy gasser diagnostic equipment.
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