Crankshaft position sensor replacement?

Tiny
KINGNQUEEN0526
  • MEMBER
  • 2003 GMC SIERRA
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
I'm replacing the CKP sensor on my truck listed above 2500hd with a 6.0l vortec. I know that I have to do a relearn procedure after doing so and I understand that I can do this process without a scan tool. Is that correct? If so can you give me the steps to do it? Also I heard that I have to put the motor top dead before replacing the sensor is this also true? Thank you in advance for your advice.
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Monday, January 25th, 2021 AT 10:08 AM

45 Replies

Tiny
SEVAG P
  • MEMBER
Hello,

Crankshaft sensor replacement can be replaced by just removing the starter to have access, no need to turn the engine on TDC.
Yes you need scan tool to perform crankshaft sensor learning procedure,

check the procedure below at pictures attached how to replace crankshaft sensor and how to perform learning by using scan tool.

Let us know if you need more help.

Thank you.
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Monday, January 25th, 2021 AT 10:50 AM
Tiny
KINGNQUEEN0526
  • MEMBER
So have you ever heard of anything like this? I have been trying to research this because if I had the money to have it done I would but that is why I am trying to do it myself without the ability to get a scan tool to use to perform the relearn procedure.
Total Car Diagnostics Article View
Crank Relearn Instructions (With and Without an OBD Scanner/Reader) | Car.
Mar 19, 2016 Turn off all of the accessories. Accelerate the vehicle to 55 mph at part throttle. Cruise at 55 mph for another 5-6 minutes. Decelerate to 45 mph without using the brakes, and maintain 45 mph for 1 minute. Perform 4 deceleration cycles, without using the brakes, of 25 seconds each where no specific speed is necessary.
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Tuesday, January 26th, 2021 AT 7:55 AM
Tiny
SEVAG P
  • MEMBER
Hello,

you can try to perform the procedure nothing to lose, but you can't be sure if certain conditions are met, the scan tool monitors certain components signal to determine if all the conditions are met to continue the procedure.
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Tuesday, January 26th, 2021 AT 11:39 AM
Tiny
KINGNQUEEN0526
  • MEMBER
That's what I kind of figured but it was a high hope type of deal with me and I guess I'll just see what happens and if all else fails then have it the procedure done with a scantool.
Thank you for your response and information.
Bruce
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Tuesday, January 26th, 2021 AT 12:58 PM
Tiny
KINGNQUEEN0526
  • MEMBER
That's what I kinda figured but it was a high hope type of deal with me and I guess I'll just c what happens and if all else fails then have it the procedure done with a scantool.
Thank you for your response and information.
Bruce
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Tuesday, January 26th, 2021 AT 12:58 PM
Tiny
SEVAG P
  • MEMBER
You are welcome let us know what happens with you.

Thank you.
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Tuesday, January 26th, 2021 AT 1:33 PM
Tiny
KINGNQUEEN0526
  • MEMBER
Okay, maybe I should have done this from the beginning. So let me fill you in on how I got to where I am with my truck.
So a few weeks ago my instrument cluster had stopped working. I was able to make it start working again by smacking the dashboard. About a week after that it had stopped again but this time I had to take the dash apart and as soon as I started to unplug the connection it started working again. Then it happened a third and final time. During this disassembly I checked all fuses and power and ground to the cluster but everything was fine with all of that. When this happened the only thing that continues to work in my cluster is the backlighting, turn signals and the check engine light. All gauges the shift indicator and the mileage indicator stop working.
When I took everything apart this time I started the truck turned it around for better access to my tools and proceeded to check everything out. But when I put everything back together and tried to start my truck it would only crank over, I had no spark on all 8 cylinders.
So I went about checking all of my fuses again inside the cab and the engine compartment which again all was good. So I've been at this dilemma for a few weeks now. Going thru everything that I could possibly think of and research on.
I have checked power and ground to almost every connection that there is on almost every sensor that there is on the engine (with only a test light). I have not been able to run a DMM on it not being able to successfully have someone crank the motor at times that I've needed so that I could check for pulse or anything. I have looked inside the dash panel to see if maybe there was a wire that may have been pinched or something and all of that looks ok. Now when I have checked the power and grounds at the sensors I also checked it and where it connects to it's ground point's. Since all was good I never checked in between connections and ground point's because since it was good at at the ends I figured that there would no bad spot in between.
During all of the diagnosis I hooked up a code reader and had a p0300 random misfire which I had been fighting for a couple months now. Even after I had done a wire and plug tune up I had the code again. But I also had a new code jump up this time which was a p0332 knock sensor 2. Since then I cleared the codes because I removed the battery to charge it. When I put the battery back in and tried to start it again I now keep getting a p0335 crankshaft positioning sensor. Which I had replaced because with the knowledge that I do have and the research that I've done that was what was leading to the no spark issue. But no good luck on my side.
The motor is still cranking over good but still has no spark. I have good fuel but do not know exact pressure reading without a pressure gauge. The motor is the 6.0l vortec and it's sitting inside the 2003 GMC Sierra 2500hd 4x4 extended cab. I'm pretty stumped on it now and really wondering what else to do or where else to look. Can you please help me and lead in a good direction to look so that that I can get my wheels back in the mud.
Again thank you very much in advance for your advice and information. Sorry for the long story about this situation but I thought it would be best to bring you completely up to speed with my truck so that you would have enough details to help.
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Thursday, January 28th, 2021 AT 6:30 PM
Tiny
KINGNQUEEN0526
  • MEMBER
Sorry, but I forgot to mention that the motor is a distributorless motor. I have 8 individual coils with wires to the plugs.
Thank you.
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Thursday, January 28th, 2021 AT 11:16 PM
Tiny
SEVAG P
  • MEMBER
Hello,

Refer to fault code p0335 you have problem on the crank sensor harness to engine control unit, check sensor connector if clean and tight, check engine control unit connectors if no water traces and tight. remove crank sensor check for any dirt and be sure not touching the sensor to reluctor wheel. if they are okay, check the procedure below step by step to fix p0335.

fault code.

check our links below for crank sensor symptoms and how it works.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Let us know what happens with you.

thank you.

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Friday, January 29th, 2021 AT 5:11 AM
Tiny
KINGNQUEEN0526
  • MEMBER
Thank you. I will do this procedure as soon as I can and let you know happens. I really hope that this is it and that I'm finally able to make the diagnosis. I was getting real close to going and buying a PCM for it thinking that maybe part of it got fried somehow. I was kind of praying that it isn't the PCM because during some of the other diagnoses I have power and grounds at all of my sensors and the leads. I just can't find a pin diagram and a wire diagram to and from the PCM to see if I'm getting signals to and from the PCM and the sensors..
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Wednesday, February 3rd, 2021 AT 8:27 AM
Tiny
SEVAG P
  • MEMBER
Hello,

Check the wiring diagram below, from crank sensor to PCM. Waiting your results.
Hope it's wiring issue not PCM.

Thank you.
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Wednesday, February 3rd, 2021 AT 10:11 AM
Tiny
FALANDO
  • MEMBER
  • 2002 GMC SIERRA
  • 8.1L
  • V8
  • 4WD
  • AUTOMATIC
  • 160,256 MILES
I'm having a hard time locating crankshaft positioning sensor it's not behind the starter
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Friday, February 5th, 2021 AT 11:13 AM (Merged)
Tiny
HMAC300
  • EXPERT
This video will help

https://youtu.be/sKo7xRWVNqY

Check out the diagrams (Below). Please let us know what you find.
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Friday, February 5th, 2021 AT 11:13 AM (Merged)
Tiny
WRENCHTECH
  • EXPERT
That's because it's not located behind the starter. It's on the back of the engine where the bellhousing meets the block on the driver's side, near the top.

https://www.2carpros.com/images/external/98875427.gif
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Friday, February 5th, 2021 AT 11:13 AM (Merged)
Tiny
FALANDO
  • MEMBER
Thank you that was very helpful
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Friday, February 5th, 2021 AT 11:13 AM (Merged)
Tiny
WRENCHTECH
  • EXPERT
Hi Hmac300, I didn't see you in there before me.
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Friday, February 5th, 2021 AT 11:13 AM (Merged)
Tiny
DOMAINCO
  • MEMBER
  • 2002 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 76,525 MILES
Exactly where is it located I puchased a new one from pep boys I removed the sensor above the crank pully and looks nothing like the one I purchased help!
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
JDL
  • EXPERT
What is the litre size of engine? My info showed the crank sensor is located above the starter. See picture.


https://www.2carpros.com/forum/automotive_pictures/170934_crankshaft_position_sensor_3.jpg

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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
DOMAINCO
  • MEMBER
I have the 8.1 liter removed the starter and did not locate sensor any other thoughts
and thanks so much for your help!
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
JDL
  • EXPERT
Sorry to lead you in the wrong direction. The 8.1 shows to be on the rear of engine block, bell-housing flange. I've never changed one of these. I just looked at the component locator for 8.1.


https://www.2carpros.com/forum/automotive_pictures/170934_81_crankshaft_sensor_1.jpg



https://www.2carpros.com/forum/automotive_pictures/170934_crankshaft_position_sensor_2_1.jpg

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Friday, February 5th, 2021 AT 11:14 AM (Merged)

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