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How to Relearn a Procedure on a GMC After Changing the Crankshaft Sensor
The crankshaft sensor on GMC vehicles is synced to the powertrain control module, or PCM. When the crank sensor is replaced, it must be resynced to the PCM. Without resyncing, the PCM cannot properly determine the position of the crankshaft. The proper procedure for resyncing or relearning the crankshaft position is called the "CKP Variation Learn." The CKP Variation Learn procedure resets the positional information in the PCM's memory and replaces it with updated information from the new crankshaft sensor.
Shift the GMC vehicle's transmission into park, or first gear for a manual transmission. Apply the parking brake and leave the engine running.
Plug an automotive scan tool's data connector into the vehicle's diagnostic data port. This port is situated underneath the dashboard on the driver's side of the vehicle, to the right of the steering column.
Power on the scan tool and select "PCM" from the main welcome menu. Select "Special Functions" from the secondary screen, then choose "CKP Variation Learn" from the "Special Functions" menu.
Allow the scan tool to perform the CKP Variation learn procedure. This can take up to 10 minutes. Do not turn off the engine or disconnect the scan tool during this procedure.
Remove the scan tool. Turn the engine off, then back on again. Verify that the engine runs smoothly.
Things You'll Need
- Automotive scan tool with relearn capabilities
Kyle Sanstrom has been writing professionally since 2008. His articles have been published on several websites including eHow and Automobile Insight. Sanstrom has undergone advanced automotive training at the Dunwoody College of Technology, holds an Associate of Arts in general studies from Century College and has more than 10 years of experience in all aspects of automotive repair and diagnosis.
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2003 GMC Safari Crankshaft Position Sensor
- Replacement
- Original Engine Management
- Walker Products
- $39.99 and under
- $40 to $79.99
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OEM (Genuine) 2003 GMC Safari Sensor, Crankshaft Position
- Notes : 6 Cylinder, 1996-05; Astro, Safari
- Item Dimensions : 3.7 x 2.7 x 1.1 inches
- Item Weight : 0.50 Pounds
- Fitment Type : Direct Replacement
- Replaces : 12562910, 10456607, 10456532
- Part Description : 2003 GMC Safari 2003 GMC Safari Sensor, Crankshaft Position
- 2003 GMC Safari | Base, SL, SLE, SLT, SLX | 6 Cyl 4.3 L GAS
Dorman ® OE Solutions Crankshaft Position Sensor for 2003 GMC Safari
- Notes: Packaging Type: Box
- Material: Metal; Plastic
- Package Contents: 1 Sensor
- Terminal Type: Blade
- UPC: 019495462873
- Part Description: 2003 GMC Safari OE Solutions Crankshaft Position Sensor for 2003 GMC Safari
- 2003 GMC Safari | All Trims | 6 Cyl 4.3L
Delphi ® Crankshaft Position Sensor for 2003 GMC Safari
- Package Contents: Engine Crankshaft Position Sensor, Instruction Sheet
- UPC: 689604108024
- Part Description: 2003 GMC Safari Crankshaft Position Sensor for 2003 GMC Safari
- 2003 GMC Safari | All Trims | All Engines
Walker Products ® Crankshaft Position Sensor for 2003 GMC Safari
- Color: Black
- Connector Gender: Male
- Connector Quantity: 1
- Mounting Bracket Included: Yes
- Mounting Hole Quantity: 2
- UPC: 724620067570
- Connector Shape: Oval
- Terminal Gender: Female
- Terminal Quantity: 3
- UPC: 724620052019
Original Engine Management ® Crankshaft Position Sensor for 2003 GMC Safari
- Connector Gender: Female
- Connector Shape: Rectangular
- Terminal Gender: Male
- Terminal Type: Pin
- UPC: 841266058608
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Crankshaft Position Sensor.... again
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7 months ago I had some trouble with my 2003 Astro Rwd. The van stalled out one day, and gave me the a code saying the crankshaft Position Sensor was faulty, I replaced the sensor and did the relearn, and the van still stalled. After doing some more looking around till I was frustrated, I took it to a shop here in town. They had it for a week and said it ran fine and they and couldn’t get the van to stall, so i picked it up. Right after pulling out of the shop it stalled. They took it back in and replaced the sensor again and relearned it. And found a bad wire in the wiring harness. After this I picked it up and it drove great... until 2 days ago when it stalled again and gave the same code. I waited 30 minutes or so and it started and got me home. Then today it stalled again. I’m so tired of chasing electrical problems. Does anybody know what could be the problem/solution or has had the same situation??? Thank you!
How many miles, what is the code that you are getting, did original CKPS have shims, any rub marks on your CKPS?
DEFINITELY check the sensor yourself. It takes 10 minutes. I chased around all kinds of stuff only to find that the CKP needed a shim that did NOT come with the replacement sensor. mine had hairline scratches on it. the shim/spacer is .02"(a couple of sheets of card stock paper) thick, but if yours is not spaced properly your van will not operate properly. mine too is an 03...GM says in the tech bulletin that you may need 2. also check the Timing cover and if it is worn or cracked, replace it. I only needed 1 shim.
Jamack513 said: DEFINITELY check the sensor yourself. It takes 10 minutes. Click to expand...
Replaced 2, in 3 months...the second one I purchased had shims. I installed with one shim...that was 3 years ago. Can't kill her now.
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2003 GMC Sierra 1500 - Crankshaft Position Sensor
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Connector shape, masterpro ignition 3 terminal crankshaft position sensor, standard ignition 3 terminal crankshaft position sensor - new, dorman oe solutions 3 terminal crankshaft position sensor - new, acdelco sensor - new, multiple applications, acdelco 3 terminal sensor.
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Step 5. Remove the scan tool. Turn the engine off, then back on again. Verify that the engine runs smoothly. The crankshaft sensor on GMC vehicles is synced to the powertrain control module, or PCM. When the crank sensor is replaced, it must be resynced to the PCM. Without resyncing, the PCM cannot properly determine the position of the crankshaft.
Vehicle had an intermittent no start, hard start, extended crank issue. It also had an intermittent p0300 misfire code, cruising down the freeway once in a w...
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7 months ago I had some trouble with my 2003 Astro Rwd. The van stalled out one day, and gave me the a code saying the crankshaft Position Sensor was faulty, I replaced the sensor and did the relearn, and the van still stalled. ... Chevy Astro and GMC Safari Forum. 438.3K posts 23K members
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