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Transmission, codes P1731 and P1732

Tiny
STEVE W.
  • MECHANIC
  • 13,462 POSTS
You replaced the PDK controller, did you program it to match your vehicle? The codes you have could all be related to the controller either not being programmed correctly or the communication line to the module being faulty.
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Friday, July 24th, 2020 AT 11:49 AM
Tiny
NAWARO69
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Hi Ken, actually I made the can test while right now nothing useful because I removed the transmission plug from down took it inside the car to test the voltage. So you will find a lot of faults which mean if I fix the plug back the only shift rods faults will stay.
Anyway I uploaded the pictures.
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Sunday, July 26th, 2020 AT 12:38 AM
Tiny
NAWARO69
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Hi Steve, I replaced the PDK control unit from the agency and I made the programming and I made the flashing also while this is not the first time
I finished almost 5 cars same model by flashing the match part number but that time there was no shift rods fault
Only the calibration not complete because of invalid data but here we can not start the calibration!
Last thing which I noticed that each shift rods should be 5v but here only 2.2v from the control unit.
I don’t know.
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Sunday, July 26th, 2020 AT 12:46 AM
Tiny
STEVE W.
  • MECHANIC
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The voltage issue would cause it. Check the powers and grounds for the module. It sounds like there is a bad connection with high resistance.
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Sunday, July 26th, 2020 AT 5:57 AM
Tiny
NAWARO69
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I checked it all and everything was fine.
I am just searching now the wiring between the gateway, selector and cluster nothing more I can do because I can’t understand why the control giving low voltage.
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Sunday, July 26th, 2020 AT 7:01 AM
Tiny
STEVE W.
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Is the low voltage with it plugged into the transmission or with it open circuit? What is the battery voltage at?
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Sunday, July 26th, 2020 AT 9:33 AM
Tiny
NAWARO69
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Normal it's giving 13.5 to 14 from the battery to the control.
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Sunday, July 26th, 2020 AT 9:40 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,603 POSTS
That sounds normal, have we did a CAN scan on this car? This video will help us see if the module is bad.

https://youtu.be/InIlnsjOVFA

Please run down this guide and report back.
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Tuesday, July 28th, 2020 AT 11:45 AM
Tiny
STEVE W.
  • MECHANIC
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The battery voltage sounds good. If you still have the old module you might plug it in and see if you get the 5 volt feed then. The low voltage would easily set the codes you have.
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Tuesday, July 28th, 2020 AT 11:52 AM
Tiny
NAWARO69
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Dear Ken,

Here’s the can scan.
But you will find some errors it must not be only because I removed some wires from inside.
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Tuesday, July 28th, 2020 AT 11:19 PM
Tiny
NAWARO69
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Dear Steve,

It’s giving the same voltage!
Guys thanks for your help appreciate it.
I really want to end this issue so please try your best.
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Wednesday, July 29th, 2020 AT 1:19 AM
Tiny
STEVE W.
  • MECHANIC
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Okay, if both new and old modules give the same voltage when connected trace the power feeds to the module and use a heavier load like a carbon pile tester or even a bigger test light to see if the voltage drops with a load applied. Internal wire damage could show the correct voltage if on'y one strand of wire was good, but it wouldn't carry a load without dropping voltage. Bad connection could do the same.
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Wednesday, July 29th, 2020 AT 12:05 PM
Tiny
NAWARO69
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Hi Steve,

I will give the car back to the customer because I realized that he didn’t not replace the transmission only the valve body
and as the agency told me that they got the same issue and in the end they replaced the transmission.
So nothing I can do more.
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Monday, August 3rd, 2020 AT 10:50 PM
Tiny
STEVE W.
  • MECHANIC
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Sounds like there is more to the story than what you were actually told. Not much you can do when you don't have all the information. Thank you for using 2CarPros.
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Tuesday, August 4th, 2020 AT 6:38 AM
Tiny
MARK CHRONO
  • MEMBER
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Hello Guys, my 991.1 C2S encountered similar issues.

First incident, the PDK transmission wont engage to any gear. Fault Code P0700 and P1732 only. An outsider tech advised me to replace the PDK Distance Sensor from https://t-design9.com/porsche_PDK_displacement_distance_gear_position_sensor.html, then the shop calibrated it using the updated PIWIS. The car was running good again but after 40 kms drive, the problem came back. Car had to be towed back to the shop.

2nd Incident, more Fault Codes, 00A005, 00A016, C12003, C12004, C12082, P0700, U0101, P1745, P1767, P1771, P18B4, P17F1, P1736, P1738.
Now the shop advised me to replace the Transmission Control Unit. We are about to order it soon.

May I know if we are on the correct path?

Thank you
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Wednesday, September 14th, 2022 AT 2:38 AM
Tiny
STEVE W.
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The U0101 is a lost communication with the TCU code so it could have failed but I would double check the powers and grounds at the main harness connector for the transmission first, you don't want to replace an expensive module over a broken or damaged wire. If the connection looks good and the harness wasn't pinched during install of the distance sensor then the Control unit may be at fault, it would cause those errors.
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Wednesday, September 14th, 2022 AT 12:31 PM
Tiny
PORSCHEEXPERT8
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Porsche Panamera Uses ZF Transmission, for P1731, P1732, P1733, P1734 fault codes not required to replace gearbox (PDK) or transmission control unit, Just simply replace following part:

- Sensor Pack (Position Sensor with Speed and Temperature Sensors)
- Part#: 97031708500, Estimated Price is 500 USD.

But before any replacement, make sure your battery life is good, because Porsche is one of the most sensitive cars to over/under voltage situations. So much technology is packed into them, that bad or going battery can and does make funny things with totally unrelated systems.
Everything in the car is controlled by microprocessors and when the voltages get low you get weird signals that can be misinterpreted by the other processors.
If not worked, then try to replace with above sensor pack.
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Wednesday, September 14th, 2022 AT 3:15 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Excellent addition to this thread! Please feel free to use 2CarPros anytime!
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Thursday, September 15th, 2022 AT 8:59 AM

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