Yep sounds like the crankshaft position sensor. If it happened right after you hit a pot hole it sounds like the sensor is loose. There should be a bolt that holds it in place. I have seen where the whole bolt was missing and the crank sensor was sliding in and out of the hole it goes into. Since the sensor works on a magnetic field if it is too far away from the crank you will get a code like that or if it is too close. Also, the whole sensor could be bad and it just could be a coincidence that it happened when you hit a pot hole. I would call your local GM dealer and ask them where the sensor is or talk to your autoparts store someone there might have experience with it.
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The PCM has been replaced
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The engine has been replaced
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The crankshaft has been replaced
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The crankshaft harmonic balancer has been replaced
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The crankshaft position sensor has been replaced
Important: Set the vehicle parking brake and block the drive wheels when performing the crankshaft position system variation learn procedure in order to prevent personal injury. Release the throttle when the engine reaches the SECOND fuel cut off. Leaving the throttle open during the fuel cut-off will allow the engine to decel at an even rate. Once the learn procedure is completed, the PCM will return the engine control to the operator and the engine will respond to the throttle position.
Important: The scan tool crankshaft position system variation learn function will be inhibited if engine coolant temperature is less than 70?°C (158?°F). Allow the engine to warm to at least 70?°C (158?°F) before attempting the crankshaft position system variation learn procedure.
The scan tool crankshaft position system variation learn function will be inhibited if any powertrain DTCs other than DTC P1336 are set before or during the crankshaft position system variation learn procedure. Diagnose and repair any DTCs if set.
The crankshaft position system variation learn function will be inhibited if the PCM detects a malfunction involving the camshaft position signal circuit, the 3X reference circuit, or the 18X reference circuit.
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If the scan tool indicates a problem with the cam signal, refer to DTC P0341 .
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If the scan tool indicates a problem with the 3X crank signal, refer to DTC P1374 .
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If the scan tool indicates a problem with the 18X crank signal, refer to DTC P0336 .
Now why do you want to replace these thing's ? mite be able to save you some time an money. Do you have a check engine light lit ? Codes ? Does it start an run ?
Help with this
Trouble Code: P1336
CKP Sensor System Variation Not Learned
Possible Causes:
Set the parking brake and block the drive wheels for safety.
Verify the hood is closed.
Read the trouble codes. If a code is set, refer to that code.
Start the engine. Allow engine temperature to reach at least 158?F (70?C). Then key off.
Select Crankshaft Position Variation Learn procedure on Scan Tool & start the vehicle.
Apply the brake pedal firmly and verify the selector is in Park.
Increase accelerator pedal position until fuel cutoff is reached at the test rpm (e.g., 5150). Quickly release the accelerator pedal after fuel cutoff is reached. The CKP system variation compensating values are learned when the engine speed (rpm) decreases back to idle speed and the procedure terminates.
Read the trouble codes and recheck for DTC P1336.
If DTC P1336 runs and passes, the CKP system variation "learn" procedure is complete. If not, look for other codes. If no codes are set, repeat the test procedure.
Explanation:
Basically using the CPS (crank position sensor) the ECU can see rotations on the crank. Using other sensor data it should be able to actually figure out exactly where it is in reference to TDC. if you think about it there is a gear on the crank the triggers the sensor, so the sensor is just sending pulses so it has to do some math to figure out where it is.
Once it has figured out where it is, it can then look at the acceleration of the crank on a per power stroke basis. if it doesn't then see the acceleration where there should be, it can then say exactly which cyld is not firing.
anyway, the point is that it is saying it was unable to decipher the crankshaft position/variation. so right now it is in a learn mode and it failed and there could be a couple reasons why.
-A chipped or damaged reluctor wheel.
-Excessive Crank run out
-Interference in the signal from the CKP sensor.
-Incorrect alignment of the CKP sensor to the reluctor wheel
-incorrect ratio of crankshaft to camshaft pulses
This is from updated GM service manual of mine.
According to the GM factory service manual, the OBD-II trouble code, P1336, is defined as follows: DTC P1336 CKP System Variation Not Learned. The factory service manual does not enumerate all of the symptoms of this trouble code, but after consulting a professional custom PCM tuner, it was learned that aside from the annoying light on the instrument cluster, the other symptoms exhibited may include: poor vehicle performance, and loss of misfire detection diagnostics.
This DTC is particularly nasty, because simply clearing it by disconnecting the battery, or clearing it using an OBD-II scan tool will not address the problem. The code will be set again later unless the vehicle is run through the actual "crank relearn" procedure.
Fixing the Dreaded P1336 DTC
There is only one way to properly fix the P1336 DTC, and that's to perform a "crank relearn" procedure, or as the GM factory service manual procedure calls it, the CKP System Variation Learn Procedure. This procedure can be initiated and performed by GM's be-all end-all scan tool, the Tech-2. It can also be performed by some aftermarket scan tools. Furthermore, some of the PCM tuning software applications are capable of initiating a "crank relearn" procedure.
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