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2007 Chevrolet Silverado 1500 4.8L OBD2 Code P0332: Knock Sensor Failure After Multiple Repairs

Model: 2007 Silverado 1500 Fault Code: P0332 Posted: 2013-08-28 11:26

I recently completed two replacements of the intake manifold, gaskets, and knock sensors, along with one replacement of the knock sensor harness. I applied high-temperature RTV to seal the sensor wells and ensured all electrical connections were secure. After these repairs, I performed OBD-II diagnostics and found no error codes. The check engine light did not come back on initially. However, after approximately one month, the check engine light reappeared, and my OBD-II scanner now shows a persistent P0332 code — indicating a knock sensor circuit malfunction. Despite these efforts, I'm facing increasing frustration and cost. I've purchased knock sensors from both Auto Zone and Rock Auto, but the issue persists. The truck has been driven under normal conditions with no noticeable engine knocking or performance issues. I'm now wondering if there's an overlooked technical solution or a known GM service bulletin related to this specific code. I'm seeking advice on potential root causes — especially whether moisture exposure, wiring issues, or sensor installation torque could be contributing factors. Any insights from experienced mechanics or owners of 2007 Chevrolet Silverado 1500 4.8L engines would be greatly appreciated.

Related fault codes

P0332

Comments (5)

Anonymous 2013-09-15 23:22

I encountered the same issue with my 2004 Chevy Avalanche in 2008. After research, I found that this was a widespread problem — so common that it led to speculation of a GM recall. While no official recall occurred, GM issued several service bulletins detailing knock sensor failures due to moisture ingress. The recommended fix includes using RTV sealant (which you've already tried). It's possible newer GM service bulletins or guidance from an ASE-certified mechanic could offer additional solutions. I recommend reaching out to a certified technician with your repair history for further insight. Best of luck!

Anonymous 2013-09-16 04:21

Jerry, if you're still having issues after multiple repairs, consider purchasing knock sensors directly from the dealership. Dealership parts are often updated and may include improved sealing or corrosion resistance. Your parts supplier should be able to advise on current OEM recommendations. Additionally, a certified dealer technician can perform a thorough diagnostic — especially since some issues might not be immediately visible during standard testing.

Anonymous 2013-09-20 14:27

Thanks for the update! I recently took my truck back to the Chevrolet dealership. The technician reversed the wiring on both knock sensors to check if one sensor was triggering a false signal before the other — and found no deficiency. Freeze frame data showed all parameters within normal ranges. He concluded that the issue might be an electrical interference or a false positive in the system. After clearing the PCM, I drove the truck for 8 miles without the check engine light returning. The technician noted that he needs the light to come back on to perform further diagnostics — which typically takes about two weeks of regular driving. I declined to let them 'joyride' my truck to recreate the issue, as it felt like a waste of time and resources. I’ve read online that a faulty PCM could be a possibility, but I don’t know how to test for this. Does anyone have experience with diagnosing P0332 in 4.8L Silverado engines? Any expert insights would be helpful.

Anonymous 2013-09-20 17:57

The P0332 code relates specifically to knock sensor #2. Why replace both sensors if only one is faulty? Check installation torque — the recommended torque for knock sensor mounting is typically between 14 and 15 ft-lbs. Also, ensure there are no secondary wires or interference near the harness that could cause electrical noise or signal corruption.

Anonymous 2013-09-21 17:06

I appreciate the input — but I'd like to clarify: my comment about 'joyriding' was not meant to be offensive. Technicians at dealerships do need time to drive vehicles and collect real-world data to diagnose issues accurately. In my experience, working at a dealership for nearly ten years, every qualified technician spends significant time on actual vehicle operation and data analysis — not just short test drives. I understand that DIYers may feel frustrated, but it's important to recognize the effort professionals invest in diagnosing complex engine problems. The goal is to help users avoid repeated repairs and wasted time. I'm grateful for this forum as a resource where experts share knowledge without judgment. Please keep your comments constructive and respectful — especially when discussing technical issues. Thank you for contributing to a helpful community.