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2.0 LSJ Engine: Crankshaft position sensor

Old Feb 7, 2022 | 02:26 AM
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Crankshaft position sensor

Hey I just redid my clutch and flywheel and slave and master cylinder. All went well and car is running great! Starts up perfect and idles smooth as can be but I got a new CEL.

CRANKSHAFT POSITION SENSOR kinda freaks me out because that clutch was pretty expensive. It's weird because before the replacement of basically everything thing in the trans I only had my below catylist efficiency code, because I have to cat.

Is there something along the way of putting back the fuse box that could've screwed it up, and is it safe to drive still? I have probably put over 1000km on it and haven't noticed any symptoms of a failing sensor. Like it's running better before but I do not want another huge bill if I can avoid it.

2007 cobalt supercharge!
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Old Feb 7, 2022 | 01:15 PM
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Which code is it? There are multiple CKP codes.
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Old Feb 7, 2022 | 01:19 PM
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Originally Posted by USMCFieldMP
Which code is it? There are multiple CKP codes.
Sorry I think it is actually camshaft p0023 b.
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Old Feb 7, 2022 | 02:51 PM
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That doesn't sound right. That code is for a Camshaft Actuator. The 05-07 SS Supercharged models do not have Camshaft Actuators.

Are you sure you have the '07 SS Supercharged model (2.0L)... and not the '07 SS model (naturally aspirated 2.4L)? GM made it stupid confusing in 06 and 07 with a second SS model. Have an engine bay picture?

EDIT: your profile indicates: "2. 4l ecotech supercharged"

Your issue is with the camshaft actuators. Either the sensors (located next to the timing chain and ignition coil #1) or the actual actuator camshaft gear.

Last edited by USMCFieldMP; Feb 7, 2022 at 02:56 PM.
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Old Feb 7, 2022 | 03:31 PM
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[QUOTE=USMCFieldMP;7752645]That doesn't sound right. That code is for a Camshaft Actuator. The 05-07 SS Supercharged models do not have Camshaft Actuators.

Are you sure you have the '07 SS Supercharged model (2.0L)... and not the '07 SS model (naturally aspirated 2.4L)? GM made it stupid confusing in 06 and 07 with a second SS model. Have an engine bay picture?

EDIT: your profile indicates: "2. 4l ecotech supercharged"

Your issue is with the camshaft actuators. Either the sensors (located next to the timing chain and ignition coil #1) or
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Old Feb 7, 2022 | 03:34 PM
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Originally Posted by USMCFieldMP
That doesn't sound right. That code is for a Camshaft Actuator. The 05-07 SS Supercharged models do not have Camshaft Actuators.

Are you sure you have the '07 SS Supercharged model (2.0L)... and not the '07 SS model (naturally aspirated 2.4L)? GM made it stupid confusing in 06 and 07 with a second SS model. Have an engine bay picture?

EDIT: your profile indicates: "2. 4l ecotech supercharged"

Your issue is with the camshaft actuators. Either the sensors (located next to the timing chain and ignition coil #1) or the actual actuator camshaft gear.
hmmm I read my profile. Not sure why I had it set to 2.4l I can tell you it is definitely not naturally aspirated. I have the 2.0L ecotec with the Eaton's supercharger. I already updated my profile. Once I'm home I'll re read the code and let you know what it is. Just give me like 20 minutes.
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Old Feb 7, 2022 | 04:09 PM
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Originally Posted by Codester291
hmmm I read my profile. Not sure why I had it set to 2.4l I can tell you it is definitely not naturally aspirated. I have the 2.0L ecotec with the Eaton's supercharger. I already updated my profile. Once I'm home I'll re read the code and let you know what it is. Just give me like 20 minutes.
the code is p0017 generic b.
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Old Feb 7, 2022 | 05:58 PM
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Did you remember to plug your cam sensor back in? It's located on the end of the exhaust cam, right above the thermostat; circled in red below.


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Old Feb 7, 2022 | 06:08 PM
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Originally Posted by USMCFieldMP
Did you remember to plug your cam sensor back in? It's located on the end of the exhaust cam, right above the thermostat; circled in red below.


It appears to be plugged in, would you agree?
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Old Feb 8, 2022 | 12:07 PM
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Looks like it. Have you cleared the code and it keeps returning? Does your car start up right away or does it take a handful of seconds and/or two attempts?

That code essentially means that the Cam sensor and the Crank sensor are not in agreement about the engine's position. The cam sensor (iirc) is used to start the car, and then the crank sensor takes over. When the cam sensor is not reading or reading incorrectly, the car will default to starting with the crank sensor, and that can cause extended cranking times. Typically, this code is caused by someone removing the housing, but not reinstalling it properly... or timing the engine incorrectly (timing chain).

How many miles/km are on the car/engine? Every replaced the chains or the timing chain tensioner?
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Old Feb 8, 2022 | 12:21 PM
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Originally Posted by USMCFieldMP
Looks like it. Have you cleared the code and it keeps returning? Does your car start up right away or does it take a handful of seconds and/or two attempts?

That code essentially means that the Cam sensor and the Crank sensor are not in agreement about the engine's position. The cam sensor (iirc) is used to start the car, and then the crank sensor takes over. When the cam sensor is not reading or reading incorrectly, the car will default to starting with the crank sensor, and that can cause extended cranking times. Typically, this code is caused by someone removing the housing, but not reinstalling it properly... or timing the engine incorrectly (timing chain).

How many miles/km are on the car/engine? Every replaced the chains or the timing chain tensioner?
The car starts up perfect, its not delayed at all.

I installed a new timing chain tensioner. Before I started the engine I made marks with a sharpie on the chain and parts of the actual teeth itself, after starting it was perfectly in time.

But like I said the car is starting better then it did before, yep I tried to clear the codes but they just come back.
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Old Feb 8, 2022 | 12:22 PM
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Originally Posted by USMCFieldMP
Looks like it. Have you cleared the code and it keeps returning? Does your car start up right away or does it take a handful of seconds and/or two attempts?

That code essentially means that the Cam sensor and the Crank sensor are not in agreement about the engine's position. The cam sensor (iirc) is used to start the car, and then the crank sensor takes over. When the cam sensor is not reading or reading incorrectly, the car will default to starting with the crank sensor, and that can cause extended cranking times. Typically, this code is caused by someone removing the housing, but not reinstalling it properly... or timing the engine incorrectly (timing chain).

How many miles/km are on the car/engine? Every replaced the chains or the timing chain tensioner?
Engine is at 197km.
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Old Feb 8, 2022 | 12:40 PM
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I would remove the valve cover and verify timing. If the tensioner was not properly engaged before first start up, timing can jump. That's the most likely reason why you have a code.

Line the mark on the crank pulley up with the timing cover. The colored links won't line up anymore, but the location of the cam sprocket indicators should still line up. There should be no chain slack between the intake and exhaust cam sprockets.






Based on this old picture of mine, there should be 14 links BETWEEN the diamond and triangle position indicators.
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Old Feb 8, 2022 | 01:28 PM
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Originally Posted by USMCFieldMP
I would remove the valve cover and verify timing. If the tensioner was not properly engaged before first start up, timing can jump. That's the most likely reason why you have a code.

Line the mark on the crank pulley up with the timing cover. The colored links won't line up anymore, but the location of the cam sprocket indicators should still line up. There should be no chain slack between the intake and exhaust cam sprockets.






Based on this old picture of mine, there should be 14 links BETWEEN the diamond and triangle position indicators.
When I first started it we checked and it was in-time.
I didn't get that engine light until after the clutch was done when we had to put the fuse box back in. Is there something that might not be tight that could've triggered the light?
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Old Feb 8, 2022 | 02:09 PM
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Sure. You could have bent or broken a pin. Taking the fuse box apart and reassembling isn't that hard. If that's what you suspect, check it out. Typically, messing something up during fuse box assembly leads to multiple issues; not just one.

If the car fires right up though, you likely still have a cam position sensor signal, it just isn't in time with the crank sensor.

What I'm saying isn't the case 100% of the time... but pretty close to it.
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Old Feb 8, 2022 | 03:23 PM
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Originally Posted by USMCFieldMP
Sure. You could have bent or broken a pin. Taking the fuse box apart and reassembling isn't that hard. If that's what you suspect, check it out. Typically, messing something up during fuse box assembly leads to multiple issues; not just one.

If the car fires right up though, you likely still have a cam position sensor signal, it just isn't in time with the crank sensor.

What I'm saying isn't the case 100% of the time... but pretty close to it.
Since I have no troubles starting do you think I could just clear the code and do the re learn process by Rev limiting it?
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Old Feb 8, 2022 | 04:49 PM
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I don't think this is a relearn issue, but you could try it if you want. Even when installing a freshly built engine, I've never needed to do a relearn. I've heard some of the 06 and 07 cars are more picky about it, but there's also a relearn-specific DTC that is usually triggered when that is the case.
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Old Feb 8, 2022 | 04:53 PM
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Originally Posted by USMCFieldMP
I don't think this is a relearn issue, but you could try it if you want. Even when installing a freshly built engine, I've never needed to do a relearn. I've heard some of the 06 and 07 cars are more picky about it, but there's also a relearn-specific DTC that is usually triggered when that is the case.
I tried it, code ds gone just waiting to see if it comes back. Do u have any other suggestions?
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