Code P0740

Tiny
RODRIGOVZQZ
  • MEMBER
  • 2002 VOLKSWAGEN BEETLE
  • 1.9L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Once it has been running for a while, the transmission starts slipping in all gears. Changed the transmission fluid cooler to an aftermarket and helped a little. Took it to a shop and didn't help. Changed the transmission at 45,000 miles at the dealer but issue came back. Put a scanner and reads p0740. Does anyone know if I can put a standard transmission? If so, does it have to be from another diesel engine or can I use a gas engine transmission, considering the diesel stroke? Any ideas? On the verge of selling but has sentimental value. Please help.
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Tuesday, September 14th, 2021 AT 5:22 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

The code indicates the converter clutch is open. The diagnostic are very specific as far as checking the fluid. When you checked it, was the engine warm and running?

Take a look at the attachments below which describe how the fluid is checked. See if anything was missed.

As far as changing it to a manual, everything, including the powertrain control module, wiring, transmission, pedals, and so on needs to be changed. Anything is possible, but at what cost is the question.

Let me know.

Joe

See pics below.
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Tuesday, September 14th, 2021 AT 9:16 PM
Tiny
RODRIGOVZQZ
  • MEMBER
Does it matter if the engine is gas or diesel? Mine is diesel and was told I could switch to a manual transmission from a gas engine Beetle. Is that true?
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Tuesday, September 14th, 2021 AT 10:17 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Anything is possible, but the cost may be an issue. The idea that you want to change to a manual transmission leaves a lot of questions unanswered. The powertrain control module in your vehicle is designed for an automatic transmission. It's designed to work in conjunction with the transmission control module for shifting, starting, and basically anything the transmission does. If the transmission is replaced with a manual, I feel (not 100% sure) that there will be problems with the PCM running the engine and other controls.

That leads to the next issue, what wiring needs to be replaced or changed, do you need a different PCM, and so on. Also, you need to keep in mind that you will need all the accessories that work with a manual transmission. You will have to install a different mount for a clutch pedal, the firewall will need to be modified and a clutch master cylinder will need to be installed, the piping between the clutch mc and a slave cylinder will need to be installed, and the trans will require different mounts, and so on.

I can nearly guarantee you that I'm missing things, but those are going to be the biggest obstacles. The cost of this is going to be very high. If it was mine, I would likely just purchase one with a manual installed from the factory and sell what you have. But that's your call.

I guess overall, can you do it? The answer is yes. However, the cost and unknowns would likely cause me to come up with a different plan.

I hope this makes sense. I don't want to just tell you one can be installed with no issues. If the vehicle was made in the 1970s, it wouldn't be nearly as difficult. LOL Things have changed over the years.

Let me know if there is anything I can do to help or if you simply have other questions.

Take care,

Joe
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Wednesday, September 15th, 2021 AT 7:20 PM
Tiny
RODRIGOVZQZ
  • MEMBER
Sounds like a lot. Keeping it simple. Can I use an automatic transmission from a gas engine or does it have to be from another diesel?
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Wednesday, September 15th, 2021 AT 7:33 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

I looked up the OEM part number for an 02 Diesel and an 02, 2.0L gas engine. The part numbers are the same, so if you get one for an 02 2.0L, it should be the same.

See pics below. Pic 1 is the diesel and pic 2 is the gas 2.0L.

Let me know if this helps or if you have other questions.

Take care of yourself,

Joe
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Wednesday, September 15th, 2021 AT 8:09 PM

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