I have a 2000 C5 with 87,000 miles on the odometer. I had a problem with the oil pressure gauge reading MAX while the engine was running at any speed. I found it is a common problem on C5's, faulty oil pressure sensor/sender. Needed to remove the intake manifold to get access. While the intake manifold was off, I replaced the oil pressure sender, camshaft position sensor, both knock sensors, knock sensor wiring harness, and intake manifold gasket set. I used all new AC Delco/GM parts. The oil pressure gauge now reads normal. After driving more than 50 miles, the check engine light came on. Diagnostic codes are P0327 and P0332 indicating low input at both knock sensors. I cleared the codes and after driving more than 50 miles the Check engine light came back on with the same codes. Does anyone have a clue as to what might be wrong?

 

Welcome to the forum . The only thing I could think of would be if the threads weren't clean on the knock sensor, you might be having a faulty ground. Were the old sensors bad?

 

No, the old knock sensors didn't give me any problem. Threads were cleaned and sealed with silicone sealant.
Thank you for your reply.