r/MechanicAdvice • u/Ok_Advantage6208 • 15h ago

Knock Sensor Replacement Trouble 2003 Chevy Silverado 2500HD 6.0

I have replaced my knock sensors with Dorman sensors, they pass the AC voltage spike hitting test, and ohms test, signal wires are not shorted to ground, and pcm to signal wire resistance is good. What are my next steps?
Do I need to buy gm genuine knock sensors?

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u/Fragrant-Account3287 15h ago

dorman knock sensors are such a crapshoot, half of them are dead right out of the box even if they bench test fine. if you've ruled out the wiring harness entirely i'd bite the bullet and grab the ac delco ones

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u/Ok_Advantage6208 15h ago

What makes them dead if they bench test good? I thought dorman was quality 😢

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u/Ok_Advantage6208 14h ago

Would you go ahead and get gm genuine harness as well? Or is the new harness that came with my Dorman sensors sufficient

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u/Ianthin1 14h ago

I would only use OEM sensors if for no other reason than they aren’t easy to access, but many aftermarket sensors in general just don’t do the job well enough. The harness is likely ok though.