97 corvette knock sensor codes. PLS HELP!
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5th Gear
Joined: Aug 2024
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97 corvette knock sensor codes. PLS HELP!
So to make it short last year I bought a 97 Corvette. I have not been able to pass inspection for whatever reason because of codes P0327, and P0332. I've got them, and the gasket set completely replaced. Still, the codes won't go away. The shop forgot to put the harnesses in so I came back, but still nothing. they ran a diagnostic and claimed the ecm has water damage, so it needs to be replaced. is this true though? I feel like it's not, but I don't know. I've always gone to these guys, but this time im iffy about their opinion.
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Moved to C5 Tech for some assistance.
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Joined: Jan 2007
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From: Dyer, IN
So to make it short last year I bought a 97 Corvette. I have not been able to pass inspection for whatever reason because of codes P0327, and P0332. I've got them, and the gasket set completely replaced. Still, the codes won't go away. The shop forgot to put the harnesses in so I came back, but still nothing. they ran a diagnostic and claimed the ecm has water damage, so it needs to be replaced. is this true though? I feel like it's not, but I don't know. I've always gone to these guys, but this time im iffy about their opinion.
Where did you get the new knock sensors. If you purchased the knock sensors off Amazon, all bets are off.
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5th Gear
Joined: Aug 2024
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Just so I understand, they replaced the knock sensors, and forgot to install the knock sensor harness? They pulled the intake again, installed the harness, and you still have the codes? Now, they are claiming the PCM has water damage, even though you have no other codes and the engine otherwise runs normally? Why do they think the PCM is water damaged?
Where did you get the new knock sensors. If you purchased the knock sensors off Amazon, all bets are off.
Where did you get the new knock sensors. If you purchased the knock sensors off Amazon, all bets are off.
Tech Contributor
Joined: Jan 2007
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From: Dyer, IN
I would take it to another shop just on them leaving out the knock sensor harness alone. The trust has been compromised. Seek another opinion.
Melting Slicks
Joined: Dec 2018
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From: Orange County, CA
If the new knock sensors are AC Delco brand, you may be another victim. Good info in this thread: https://www.corvetteforum.com/forums...ck-sensor.html
TLDR; recent (last few years) AC Delco knock sensors don't seem to have the right sensitivity for the C5, and for many of us will throw a fault code. NAPA knock sensors have proven a worthy replacement.
TLDR; recent (last few years) AC Delco knock sensors don't seem to have the right sensitivity for the C5, and for many of us will throw a fault code. NAPA knock sensors have proven a worthy replacement.
Melting Slicks
Joined: Sep 2021
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Some early 97 models had batteries that cracked and leaked acid onto the electrical box underneath the battery and that causes all kinds of weird problems. If you see any evidence of corrosion under the battery that might be an area to investigate.
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I have seen many PCMs damaged due to battery acid leaking on them from above. I have never seen a PCM damaged by water where the connector seals were intact and exposed to normal moisture i.e. car wash, storms, driving through low water, etc. I have seen PCMs non-functional due to the car being under water. Not saying that it is impossible, but not probable where you would have water damage to the PCM isolated to one circuit. Did they offer any pictures? Show you the evidence of water damage?
I would take it to another shop just on them leaving out the knock sensor harness alone. The trust has been compromised. Seek another opinion.
I would take it to another shop just on them leaving out the knock sensor harness alone. The trust has been compromised. Seek another opinion.
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From: Dyer, IN
Thread Starter
5th Gear
Joined: Aug 2024
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I agree with you. We all can make a mistake. But seriously, how can you replace KR sensors, and forget the harness?? After installing the new sensors wouldn't it be logical to look for the connectors? The "light bulb" should've gone on then, dontcha THINK??!!! At the labor rate these shops charge, this is a rather large screwup. I also have to ask, where was this car purchased? Does the OP know for sure its not a flood car?
Safety Car
Joined: Aug 2011
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From: Portland OR
What I got out of this was that the shop replaced the sensors but used the orig harness. Then went back and replaced the harness. It’s common to replace the harness when doing the sensors. As lon as you are in there right?
Anyway, it would be hard to believe water damage inside the ecu. Maybe at the connectors though. That would be easy to see.
In that case, I’d clean the pins, and use DeOxit on the connector. Plug and unplug several times and see if it fixes it.
You would also want to ohm between the sensor connectors and the ECU. Basic pain in the *** on the C5.
Anyway, it would be hard to believe water damage inside the ecu. Maybe at the connectors though. That would be easy to see.
In that case, I’d clean the pins, and use DeOxit on the connector. Plug and unplug several times and see if it fixes it.
You would also want to ohm between the sensor connectors and the ECU. Basic pain in the *** on the C5.