yes I replaced it along with camshaft sensor. Going to get the codes for you tomorrow. I thought that’s what it is after watching a few vids. But I’ll scan the truck.

 

Thanks for the info. I need to invest and get something for my garage. Which ones are good for home use as far as scanners?

 

Then you need to relearn the CKP.
Try this:
If the Crankshaft Variation Relearn is not accessible through your scanner (some truck applications 1998 & later), perform the relearn in the following manner:
1. Turn off all of the accessories. With the Air temperature sensor and Coolant temperature within 5 degrees (Centigrade) of each other, start the engine and let it idle in Park or Neutral for two minutes.

2. Accelerate the vehicle to 55 mph at part throttle. Cruise at 55 mph for 8- 10 minutes until the engine reaches operating temperature.

3. Cruise at 55 mph for another 5-6 minutes.

4. Decelerate to 45 mph without using the brakes, and maintain 45 mph for 1 minute.

5. Perform 4 deceleration cycles, without using the brakes, of 25 seconds each where no specific speed is necessary. Returning to 45 mph for 15 seconds in between deceleration cycles.

6. Accelerate to 55 mph and cruise for 2 minutes.

7. Stop the vehicle and idle for 2 minutes with the brake applied and the transmission in Drive (automatic trans.) or Neutral (manual trans.) with the clutch depressed.

 

P1336
GM Type Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled Description CKP Sensor System Variation Not Learned Conditions Cause: No CKP or CMP sensor codes set, engine running, then the PCM detected that no CKP variation values were stored in memory

 

Thanks. Will give this a try.

 

P0300 oxygen sensors. That is the only code that came up.

what I noticed when I drove it, solid engine light will start to flash when certain speed or rpm reaches. Also do feel a misfire. Will wait for the sensors to arrive and see what happens.

 

In the GM eSI System GM does not show any alternate methods (not using a scan tool) like they do for some other things like security relearn or key fob programming. Only using a scanner.... My personal preference for working on these is a Tech2 as it has certain functions that no other scan tool has like working with the rear air suspension (if you have that), etc. I got mine years ago from https://www.chinacardiags.com/ and I know at least a few others on here have gotten one from there as well. Pretty much any "new" Tech2 is a chinese clone and not all of them work right. The ones from the site I linked have been proven to work fine though as many GM owners on various forums have bought one from there... There are of course many other brands as well that can do a crank variation relearn so if you go that route just be sure to research what the capabilities of the tool are. Nearly all of the very lowest cost ones can only just read and clear codes and have no diagnostic ot testing ability.

From the GM eSI system.

"Crankshaft Position System Variation Learn
Install a scan tool. Monitor the powertrain control module (PCM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
Select the crankshaft position (CKP) variation learn procedure with a scan tool.

The scan tool instructs you to perform the following:
4.1. Accelerate to wide open throttle (WOT).
4.2. Release throttle when fuel cut-off occurs.
4.3. Observe fuel cut-off for applicable engine.
4.4. Engine should not accelerate beyond calibrated RPM value.
4.5. Release throttle immediately if value is exceeded.
4.6. Block drive wheels.
4.7. Set parking brake.
4.8. DO NOT apply brake pedal.
4.9. Cycle ignition from OFF to ON.
4.10. Apply and hold brake pedal.
4.11. Start and idle engine.
4.12. Turn A/C OFF.
4.13. Vehicle must remain in Park or Neutral.

4.14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:

• CKP sensors activity--If there is a CKP sensor condition, refer to the applicable DTC that set.
• Camshaft position (CMP) sensor activity--If there is a CMP sensor condition, refer to the applicable DTC that set.
• Engine coolant temperature (ECT)--If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.

Enable the CKP system variation learn procedure with a scan tool.

Important: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.

Accelerate to WOT.
Release when the fuel cut-off occurs.
Test in progress
The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315 . If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.

The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:
• A CKP sensor replacement
• An engine replacement
• A PCM replacement
• A harmonic balancer replacement
• A crankshaft replacement
• Any engine repairs which disturb the CKP sensor relationship"

 

P0300 unlikely caused by O2's. Hummer H2 P0300: Engine Misfire Detected

 

Thanks Hummerz

found a shop that will do the CASE relearn and I’ll have them look at other things but in the mean time I did a little resistance test on the O2 sensors and here are the results:

Bank 1
Sensor 1 (upstream) is at 5.4 V
Sensor 2 (downstream) is at 12.6 V

bank 2
Sensor 1 is at 5.2V
Sensor 2 is at 13.3 V.

Thoughts on these readings? Looks like sensors 2 are within the right range but not so sure about the Sensor 1 voltages.

 

meant to say ohms lol been too long