1997 740il Transmision trouble zf5hp30

Tiny
DGRIZZZ
  • MEMBER
  • 1997 BMW 740
I have a v8 with a zf5hp30 trans. This is a two owner car me being the second It has 183000 miles. I have had is since 90000miles. It has been mantained at bmw shop. Just recently I was getting a clunk on downshift. I took it in to be serviced and check the clunk. They checked codes and it showed voltage fault and brake level sensor. They said they stress tested the tranny and said it needed to be replaced. So I had my wife pick it up. She barely got home on limp mode. I was out of town at the time. I got home and pulled the batt to find it was bad. I changed the batt and now I am getting 2 different codes. P0720 & P0733 It will not hold a forward gear it goes to slipping or neutral. If I putt it in reverse it will go good. I put it in drive and it hits good then goes back to neutral. I am not sure if the trans is bad now or just the output speed sensor. Any Ideas?
Thursday, October 4th, 2007 AT 11:36 PM

9 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,603 POSTS
Inspect the fluid.
If it is burnt, replace the transmission.
At that mileage the trans is probably toast.
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Friday, October 5th, 2007 AT 9:39 PM
Tiny
DGRIZZZ
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I have now re-built the transmission but did not replace the speed sensors. I am still getting the code P0720-(Output speed sensor Cuircut malfunction) now that everthing is back together. When I went to test drive the car, there were no codes detected. On return I checked again and I am now getting the P0720 code. What do you suggest?
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Sunday, October 21st, 2007 AT 11:08 PM
Tiny
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Replace the speed sensors
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Sunday, October 28th, 2007 AT 11:30 PM
Tiny
DGRIZZZ
  • MEMBER
  • 7 POSTS
Ok I have replaced the speed sensors and resolved all problems. The trans road test great! The funny thing is that now I have got a o2 sensor code. P0150 wich is o2 sensor bank two sensor one. But out of the 4 that are there wich is it and how come it decided to go bad al of a sudden?
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Monday, October 29th, 2007 AT 6:58 AM
Tiny
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  • MECHANIC
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They do that, replace the sensor with an OE BOSCH UNIT ONLY!
Then reset adaptations and drive the car.
Have a nice day
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Monday, October 29th, 2007 AT 10:59 AM
Tiny
DGRIZZZ
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  • 7 POSTS
One more thing if you dont mind. The sensor that is bad can you tell me which position it is? THere are 4 so is it the right side first one back or the left side second one back? Code is p0150
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Monday, October 29th, 2007 AT 8:05 PM
Tiny
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Bank one is right side and it will be before the cat
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Monday, October 29th, 2007 AT 8:34 PM
Tiny
DGRIZZZ
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Thank You, I will change it out next weekend! Duane
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Monday, October 29th, 2007 AT 8:48 PM
Tiny
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Have a good day
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Monday, October 29th, 2007 AT 10:45 PM

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