Trans failsafe program - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 04-09-2012, 12:36 PM
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Question Trans failsafe program

2003 / 525i . DRIVING IN VERY HEAVY RAIN / HIGH WATER AT HIGHWAY SPEEDS OF 50MPH. T F P LIGHT COMES ON. SHITS INTO 3RD. AFTER DRIVING HOME & PARKING IN GARAGE, IT WILL NOT SHIFT INTO REV. TRANSMISSION HAS BEEN SHIFTING FINE. RELATIVELY NEW BATTERY. ORIGINAL ALTERNATOR THOUGH. I HAVE READ A LOT OF "RESET" BLOGS & NONE OF THEM WORK. I DID READ A LOT ABOUT WATER PROBLEMS ON CONNECTIONS.

QUESTIONS:
1. WHERE ARE THESE CONNECTIONS
2. WHERE IS THE TRANSMISSION CONTROLLER
3. WHAT IS THE PROCEDURE TO RESET THE T F P MODE
4. yOUR OPINION.... WILL THE WATER EVAPORATE OR
5. IS IT TIME TO REPLACE THE CONTROLLER OR PLUGS.
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#2 (permalink) Old 04-09-2012, 02:00 PM
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Please turn off caps lock. Are you referring to the vehicles "limp mode"? You should get the OBD system scanned to see what codes come up and we can help you from their. I don't know how water would be playing a factor in your problem.


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#3 (permalink) Old 04-09-2012, 02:33 PM
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The manual refers to the "FAILSAFE MODE". I don't remember seeing the term "LIMP MODE" anywhere.
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#4 (permalink) Old 04-09-2012, 02:35 PM
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Follow up.... The car is in the garage. Not sure if I want to get it out to a computer hook-up without reverse. I'm pondering how to get it to the shop and back.
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#5 (permalink) Old 04-09-2012, 02:43 PM
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Limp mode is more of a slang term. It refers to the car going into a failure mode to protect the transmission and engine when a fault is detected.

Most auto parts stores rent am OBD-II code scanner. It plugs into the OBD port under the dash and reads any codes stored their. If your transmission went into limp mode it would have thrown a code.


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#6 (permalink) Old 04-09-2012, 03:05 PM
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My 2001 740 did that once. I reset the codes with the obd scanner then I unplugged the battery for twenty minutes. I havent had trouble with it since then, but it may help you get it to the shop. Good luck.

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#7 (permalink) Old 04-10-2012, 10:36 AM
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Good morning all.

Problem resolved.

I took the 525i to the BMW garage specialist Alex at Auto Hans in Addison Texas. He checked it out while I waited. Driving thru high water was the demon. Alex checked the codes (there were several) put the car on the lift, took the electrical connectors in the back of the trans apart, dried them out, sprayed them with elelctrical connection cleaner/sealant and put them back together. It runs like new. I was in his shop for 1 hour, dropped $100.00 and it is the best money I've spent in years. I'm proud to support a business that takes care of me and my life's stuff without a ripoff from the get go. He gave the car a good check out as well. I would have spent hours and many $$$$ if I'd tried this myself without the tools and a lift. I just had a hunch that it was the massive amount of water that cause the problem.
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#8 (permalink) Old 04-10-2012, 12:34 PM
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Glad to hear it worked out well for you.


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#9 (permalink) Old 04-10-2012, 05:01 PM
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Welcome to the Werkz, thanks for sharing the cause and resolution of this problem. Its good to hear about successful resolutions to problems, and businesses that provide good service at a reasonable price.


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#10 (permalink) Old 04-25-2012, 12:58 PM
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had the same problem with my e39 528i.. Wife went though a large area of water the day before.. Started to drive to work the next day and trannie wound not shift to the next gear.. did some research and lifted the car clean and dried all the connector near and around the trans. re-tape some expose wires and car ran with out any more problems. I did find some transmission fluid on the pan comming from the fill plug, looks like the o-ring is bad.. just order a new OEM transmission kit from Pelican Parts for $30.00 and 4litters of trans/oil for $39.50.. for this weeken project...
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#11 (permalink) Old 04-26-2012, 02:43 AM
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Quote:
Originally Posted by alex1020 View Post
had the same problem with my e39 528i.. Wife went though a large area of water the day before.. Started to drive to work the next day and trannie wound not shift to the next gear.. did some research and lifted the car clean and dried all the connector near and around the trans. re-tape some expose wires and car ran with out any more problems. I did find some transmission fluid on the pan comming from the fill plug, looks like the o-ring is bad.. just order a new OEM transmission kit from Pelican Parts for $30.00 and 4litters of trans/oil for $39.50.. for this weeken project...
A word of caution about some of the after market ATF filters, some people have had the filter collapse on itself thereby restricting the flow of fluid. OEM should be fine, but make sure it is what its properted to be.


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#12 (permalink) Old 04-26-2012, 12:47 PM
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Thanks Brettsky... I will look at it today when it comes in... "good looking out"
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#13 (permalink) Old 04-27-2012, 06:03 AM
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The torque converter will normally hold about 50% of the ATF (depending on your car), and draining the pan leaves that dirty oil in the (torque converter) system to contaminate the fresh oil that you put in. The trick that has been passed on to me to effectively drain the torque converter before you drain the pan, is to disconnect the output side of the transmission oil cooler and then start the car, let the car idle and the torque converter will pump the oil out, as soon as the flow of oil stops, you switch the engine off and reconnect the hose to the cooler. You then proceed as normal with the draining of the pan, changing of filter and then refilling of the transmission. Obviously you'll need more oil, but it does reduce how much old oil remains in the system dramatically. Use caution when doing this that you don't scold yourself, and have a suitable sized catch container for the old oil. DO NOT RACE THE ENGINE TO SPEED UP THE DRAINING PROCESS.


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#14 (permalink) Old 04-26-2013, 10:43 AM
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Sorry to bump an old thread. I have been researching on this site for weeks now, found some great info! But, I feel like I need to post my problem at this point.

1999 - 528it Wagon. 161,000 miles. Check engine light is on, LIMP MODE.

A couple months ago my car went into LIMP MODE on the hwy. I carefully drive it home and parked it, pulled up the E-brake, turned off the car. Released brake, started the car. Everything was fine for a couple weeks. Then one morning I go out to the car and the battery is dead. I jump the car and it will not start. I remove the battery and bring it to AutoZone and have it charged... they say it is fine. Car is fine for a while... then the radio stops making sound, alarm system stops working, door locks stop working.

I replace the amp, fixing the radio. I found the central locking fuse is blown, replace it. Re-program keys. Car is working fine. Although the Check engine light has been on for months.

So after all that, now my car is in limp mode. One morning I go out to the car and it's in LIMP MODE. I go to autozone and have the battery tested. They say it's at 40%, so I have them charge it up, they say its fine. I install it. Does not fix the LIMP MODE. A couple days pass car sitting. I finally drive the car to Advanced auto and have them read my codes, and check the battery again. They say my battery cel is bad and it will not hold a charge. SO I buy a new battery in hopes this will fix the LIMP MODE. I install it. NOTHING. Still in Limp. I tried to reset by doing the gas pedal for 30 seconds, then brake for 10 seconds, shut the car off. Nothing.

Here are the codes: P0141, P0155, P0135, P0600, P1423, P0441, P1421

Can anyone help? I am going to have my brother in laws friend (who works for the largest BMW dealership in Atlanta, he's a tech) take a look at it if he will do it. I do not trust the indy shop I was going to anymore, or the dealership.

Please help, thanks in advanced.

PS: I have searched the site and read for weeks. Just need a little help. Thanks!
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#15 (permalink) Old 05-01-2013, 01:57 PM
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I know its a year later than these posts, but my 97 528i was down shifting on the highway into S-2 and revving super high rpm's after being in heavy rain. A few months later it started doing it regardless of the rain situation. So I put it on jacks and looked at the plug on the drivers side of trans. The tranny side of the plug wires all have cracked insulation and exposed wires. It's a mess. Called a local shop to talk about the possibility of replacing the part those wires go to and was told I would be better off getting a reman tranny and replacing it. A nice $4500 fix. I paid less for the car. I'll figure something out.
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