Hard shifting, codes PO133, PO781 and P1336

Tiny
ADAMDRIVES
  • MEMBER
  • 2001 SATURN SC2
  • 1.9L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Hello, don't know if this has already been addressed but I am just looking for some help. I have the car listed above and the moment I drive the vehicle past 35 MPH I get a hard shift. I also have a reverse slam that occurs but sometimes goes away it fluctuates. So far I have replaced the transmission fluid and filled it with 4 quarts, changed the transmission filter, changed the valve body and tested all solenoids for the 4.5-5.0 ohms range, changed the transmission temperature sensor and am now working on the downstream O2 sensor because I have also received this code. The codes I have so far are: PO133 Heated Oxygen sensor slow response bank 1 sensor 1, PO781 1-2 Shift, and P1336 Crankshaft Position CKP System Variation Not learned. I have also replaced the PCM and had it flashed with the dealership before installing the new valve body. Don't know where to go from here as this is my only form of transportation. The fuses are good too because I tested them for continuity. I am now going to try and replace the Crankshaft Sensor to see if it works out. Thanks for the help. Also when I installed the valve body the car was able to go to 70 mph but then hard shifts now past 35 MPH and there are no hard shifts in third gear.
Thursday, July 15th, 2021 AT 12:57 PM

38 Replies

Tiny
ASEMASTER6371
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  • 52,797 POSTS
Good afternoon,

I attached the flow chart for the 781 code. There are several possibilities and one of them has to do with the crank sensor. It looks like it was replaced but never relearned. This must be done to make sure the correct signal is being sent to the module.

https://www.2carpros.com/articles/automatic-transmission-problems

I also attached a wiring diagram of the transmission for you as well.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Roy
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Thursday, July 15th, 2021 AT 2:22 PM
Tiny
ADAMDRIVES
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Thank you so much for the help, it means a lot.

Also I am going to have the dealer check it out and see what's going on. When I installed the PCM, I brought the car over to the dealer to get it flashed and after he was done, I got the blinking wrench right after. Do you think that since the PCMs are set to Crankshaft Relearn Procedure "No" when they are brand new; he tried to do the relearn procedure but failed at doing so? I was reading the diagrams attached and saw that if there are any misfires, the CKP procedure will not work. I haven't replaced the CKP sensor yet and wondered if this would cause any misfires due to it giving information to the PCM.

I tested the solenoids with voltage but I am going to see if I can get them audibly tested as well. The thing is is this is my second valve body from the same seller and there is no change at all. If you all want I can post the original codes from my stock valve body, and the codes from the 2 valve bodies I bought.

Now that I remember I did notice that when I put the valve bodies in, the car would begin to shift normally after a few hard shifts but then degraded back to the usual hard shifts again. Does this seem like an electrical issue, I even tested the voltage on the valve body that I bought and the solenoids looked good

I'm just a college student trying to get by and I am very grateful for your responses.

I appreciate the help.
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Friday, July 16th, 2021 AT 6:38 AM
Tiny
ASEMASTER6371
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Okay, that relearn has to be done. As long as there is no code for the crank sensor, it should run the relearn. If it does not, then you may have a bad ECM. Was the replacement new or used?

Roy
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Friday, July 16th, 2021 AT 6:48 AM
Tiny
ADAMDRIVES
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I bought the new one from Summit Racing, it's the one located behind the car battery on the firewall.
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Friday, July 16th, 2021 AT 9:29 AM
Tiny
ASEMASTER6371
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It still could be bad if it will not do the relearn procedure.

Is the check engine light on?

Roy
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Friday, July 16th, 2021 AT 10:06 AM
Tiny
ADAMDRIVES
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Yes it's still on.
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Friday, July 16th, 2021 AT 10:18 AM
Tiny
ASEMASTER6371
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Does it have a 335 code? If it does, it will not perform the relearn.

Roy
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Friday, July 16th, 2021 AT 10:20 AM
Tiny
ADAMDRIVES
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You think the dealership doesn't know how to flash it? Does the misfires during the relearn procedure come from the PCM?
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Friday, July 16th, 2021 AT 10:20 AM
Tiny
ADAMDRIVES
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It has the PO781 and P1336.
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Friday, July 16th, 2021 AT 10:21 AM
Tiny
ADAMDRIVES
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As well as the PO133 Oxygen sensor error.
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Friday, July 16th, 2021 AT 10:22 AM
Tiny
ASEMASTER6371
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Okay, it should run.

What did the dealer tell you about it not working?

Roy
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Friday, July 16th, 2021 AT 10:42 AM
Tiny
ADAMDRIVES
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I'm going to go Monday morning again and talk with the head technician because the last guy messed it up I think because he said he put in my VIN number and now it all lines up with the system. But I am going Monday for round 2 it only goes 35 MPH ow without doing a huge clunk. So I go slow on the road.
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Friday, July 16th, 2021 AT 10:48 AM
Tiny
ADAMDRIVES
  • MEMBER
  • 21 POSTS
Maybe he does not know how to do the crankshaft relearn procedure and that's what caused all of this mishap. Do you think so? Thank you, you are really helping me out with this.
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Friday, July 16th, 2021 AT 10:50 AM
Tiny
ASEMASTER6371
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The scan tool is what tells you what to do for the relearn. It is hard to get the procedure wrong.

Roy
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Friday, July 16th, 2021 AT 10:52 AM
Tiny
ADAMDRIVES
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I agree with you, just trying to understand why I keep getting the code. Do you think the downstream exhaust heated O2 sensor will cause the PCM to have wrong codes and shift wrong? Because I also have the PO133 Oxygen sensor code as well.
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Friday, July 16th, 2021 AT 10:58 AM
Tiny
ASEMASTER6371
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Before the 781 will go away, the crank relearn has to be done. It is part of the flow chart for the 781 code.

Roy
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Friday, July 16th, 2021 AT 11:02 AM
Tiny
ADAMDRIVES
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Oh, I see so basically the 781 1-2 shift error is caused from the failed crankshaft relearn procedure, are there other people besides the dealer that can perform this crank relearn. And what system would be used so I can ask around? And if it fails again there's something causing a misfire.
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Friday, July 16th, 2021 AT 11:09 AM
Tiny
ASEMASTER6371
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No, it contributes to the hard shifts. You need that finished first so the ECM sees the correct signal for the shifting.

Roy
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Friday, July 16th, 2021 AT 11:12 AM
Tiny
ADAMDRIVES
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So should I take it and have the relearn procedure done again or should I still figure out what's causing the 781 code? Thanks. Sorry I am completely new to all of this. What would you do in my situation?
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Friday, July 16th, 2021 AT 11:23 AM
Tiny
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You need to have the relearn done and verified it is complete before proceeding on the 781. It is possible it will help it substantially.

Roy
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Friday, July 16th, 2021 AT 11:28 AM

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