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Discussion Starter · #1 ·
Hello all,

I have just recently joined this forum and i'm hoping someone can help with a problem.

A little info:

2001 VW Jetta tdi
Automatic trans
128,000 mi.

I started using biodiesel in the car and i'm on my 5th tank. I didn't change the fuel filter until about the 3rd tank or so. (Which is odd because i thought i would need to change it after about 1/2 tank or so). I have recently been getting the p0740 code on my check engine light and the transmission was shifting oddly. It would take a while to shift from 3rd to 4th. And on the highway, intermittantly, it would seem like it wasn't going into overdrive. I took it to the dealer and after driving it a few miles, they informed me that the transmission was going bad and would need to be replaced($5,500.00) WOW.

I am not satisfied with their conclusion and i'm wondering if using biodiesel could cause anything else to make the car react in this way.

Thanks for any help.

Premium Member
9,739 Posts
Welcome to the forum. welcometomyturbodies

EOBD II Error Code: P0740

Fault Location:
Torque converter clutch (TCC) solenoid - circuit malfunction

Possible Cause:
Torque converter clutch (TCC) solenoid.
Engine control module (ECM)/Powertrain control module (PCM)/Transmission control module (TCM).

As taken from my http://www.myturbodiesel.com/forum/f9/free-eobd-ii-error-codes-software-2919/
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