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Discussion Starter #1
Hello people. Well it's my first post and I am really in need of some help. My wife's 2006 Merc A150 has developed a gearbox fault. Selecting drive or reverse is not a problem. Put it in drive and pull away it pulls smoothly but will not accelerate past 50mph. Seems like it will not change up. Rapid acceleration has NO kick-down so seems that the box changes only so far then stays in that gear. (limp home?). Dash displays "transmission fault - workshop" Turn ignition off and display clears. Start up and display stays clear. Put it in drive and warning comes up. Same for reverse.
Had a Bosch KTS scanner plugged in and four codes came up.
P0793
P0722
P0896
P2731
I do have some mechanical experience (heavy truck mechanic some years back) so am willing to give it ago. Would love to check oil level and change it and the filter but as you are aware - NO DIPSTICK and Mercedes won't sell me one.
Would like to know if these codes represent a "quick" fix is possible or am I looking at silly money and a new box/overhaul.
Really need some advice please. I don't want to scrap the car.(good condition and 57500 miles on clock).
Thanks guys.
(maybe a recommendation of a good garage in south London who might be able to help?)
 

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Late 2005 A class 200CDI
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W169 gearbox

I have a 200cdi w169 with the cvt auto box. Mine was doing
A similar thing. Took it to the main dealer who said it needed a new gearbox
At something like £5,000. Ended up doing some reading around and found
That the gearbox ecu is actually inside the gearbox and they along with the B class suffer from the speed sensor on the main ecu board failing. Anyhow, I found a gearbox rebuild specialist down my way south east England who plugged it into a merc fault reader and pulled up speed sensor errors and downshift errors. Was given two options, they could source a new one from MB for around £800 or they knew a place that if I could live without the car for a week could unseal the ecu and replace the speed sensor and re test it all. So I went for the ecu repaire, it cost around £400 all in I think and have done about 23,000 more miles on it since over the past year - so all good. Found loads of places said the gear box was gone or the EcU could not be fixed, guess I struck lucky and found a good shop that knew what they were talking about.
 

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Discussion Starter #3
Thanks for the reply. I was just wondering if you may remember the name of the guys you dealt with, or even the area they operate in. I might be able to track them down and give them a ring.
Thanks.
 

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A160 W168 /2002
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546 Posts
ECU Testing.com are the boys , they are saving w168 drivers a fortune in repairs,
and keeping many A Class on the road World wide, Visit lofty's home page to see what is involved the auto gearbox will be basically if not the same unit.
aclassinfo.com

Having just purchased a very low mileage W169 I might be seeing more of this forum. Lofty
 

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Discussion Starter #5
Looks like problem is sorted.

Hi Lofty
I did not find too much info on W169's CVT gearboxes.
Anyway I dropped the oil out and changed filter. (It had the wrong oil in it for starters. Put some Merc CVT fluid and a new filter in and tried it but there was no change.
Dropped the valve chest out and sent it together with the TCM to ECU Testing and they found some issues which they repaired. Bolted it all back together and took it for a drive and seems like the problem is sorted. Time will tell.
Thanks for the input. Will let you know how it goes.
Thanks
 

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A160 W168 /2002
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That's great news if you sent it to ECU testing I don't think you willl have more problems, plus they put a life time guarantee on most of their repairs
 
313 4x4 ,E320 CDI X 4,A160,A170 CDI ,W123,420 SEL,S420 L,420SEC,230,SLK230K, C180 ,C200,C230K, C230K
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w168 auto F fault

bought one of these W168 A170 cdi with gearbox fault, stripped it, sent it to ECU testing , refiited, now another fault......
sent it back .....now refitted and seems to be working,,,not counting my chickens yet.

but before refitting make sure you pull out the strainer and replace it with a new one ,mine was blocked solid
 

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Hi All, i have just purchased an W169 A170 CVT petrol that the previous owner sold to me with a gearbox fault. It was taken to the main dealer who diagnosed that it needed a gearbox ECU. I have been reading about ECU testing and plan to remove the ECU and send it to them. Are there any instructions on how to remove the ECU, where it is located etc? I am a capable home mechanic and have rebuilt the engine in my 911 etc.
Any help will be appreciated, and i will be happy to report what happens etc.
The car was too cheap to turn down, if i can't fix it i will break it.
I Live in the south east, near Colchester and would welcome any reccomendations for local independents.



Robin
 

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I have spoken to the main dealers in Northampton. they don't have the error codes, but quoted on a replacement gearbox ecu part number 169 370 11 06 80 and a steering knuckle, £1400 and £700.

i get the car next week and will remove the ecu from the bottom of the gearbox and send it to ECU testing, i will get a 2nd hand knuckle and fit that, anyone know what goes wrong with a knuckle? it is a casing i presume... £700 sounds steep.

will keep you posted, may take some photos of my efforts to remove and refit the ecu.

fingers crossed.
 

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Update. I have the car and have covered 150miles, during this time it has had the sensation of slipping out of gear twice. I have had the codes read and got;
2732. impermissible opening of hydraulic clutch forward gear has occurred. CVT
0896 Impermissible adjustment of step-down ratio in CVT
0722 RPM signal from sensor Y3/9b5 (CVT) output rpm sensor not available.

there is a wheel bearing noise from the RH front corner. Other than that all good.
 

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Okay so the transmission control unit is out now and on its way to ECU testing. After conflicting info I purchased a manual from emanualonline. The manual took an age to load, but is excellent with all MB info. £9.99.
Anyway the proceedure is
1. Get the car in the air
2. remove the sump plug and drain the oil. Keep it all amd measure it so that you know how much to put back in.
3. Remove the ECU connector on the rear of the gearbox above the sump. The connector has a red safety clip, slide this towards the gearbox, then squeeze the top of the connector close to the cable exit and pull, it is a difficult one but comes with a little force.
4. clean the area to avoid any dirt getting into the gearbox, it can be damaged by very little contaminant, use lint free cloth etc.]
5. Remove the sump pan and then the oil filter housing which just pulls out.
5. Remove 16 of the 18 screws that secure the unit.
6. support the unit and remove the last 2 screws and drop the unit into a clean container.
7.Package carefully and send away.

notes
1 the connector on the top remains with the unit and drops with the unit when it is removed.
2. package well in plastic and bubble wrap. don't attempt to clean, or remove any parts to have a look.
3. There is no need to remove the wheel, or arch liner as suggested by some.
 

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Okay so it is time for the final update.
Steering knuckle. I had a look and i think that the MB dealer had attempted to replace the wheel bearing, but it was stuck. I got a 2nd hand knuckle from a 15,000 mile car for £45 and fitted that, it took around 1 1/2 hours for me to do and the rumble is now gone.
I sent the ECU to ECU testing and they found no fault. They tested it twice, so i re fitted it with new oil and filter etc. The interesting thing was that i measured the amount of oil that i drained and re filled using the correct dip stick and measuring instructions from the MB work shop manual. i drained 5 liters and had to refill with 6.25 liters. I think that the oil was low and now looking back on the problems, they happened after taking a roundabout with some enthusiasm. could the gearbox problem have been low oil level/surge?
I have now done 1,000 miles in all conditions with no problems and no error codes. MB main dealer price for repairs was £2,100. it cost me £142.00 including manual and dip stick.
 

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Need Help For Auto A150 Transmission Problem, Please.

Hi,can any one suggest me a good garage with a good price to fix my car ? I bought the second hand Mercedes A150 Auto last year and now it got a Transmission ECU sensor Problem. Took it to the Mercedes garage and been told need more than £1000.00 to get it fix ! This is a huge money and I can't afford it because I am a full time mum to look after my ASD child. I just hope if any one can recommend me a garage with more better price. Thank you
 

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I have a 200cdi w169 with the cvt auto box. Mine was doing
A similar thing. Took it to the main dealer who said it needed a new gearbox
At something like £5,000. Ended up doing some reading around and found
That the gearbox ecu is actually inside the gearbox and they along with the B class suffer from the speed sensor on the main ecu board failing. Anyhow, I found a gearbox rebuild specialist down my way south east England who plugged it into a merc fault reader and pulled up speed sensor errors and downshift errors. Was given two options, they could source a new one from MB for around £800 or they knew a place that if I could live without the car for a week could unseal the ecu and replace the speed sensor and re test it all. So I went for the ecu repaire, it cost around £400 all in I think and have done about 23,000 more miles on it since over the past year - so all good. Found loads of places said the gear box was gone or the EcU could not be fixed, guess I struck lucky and found a good shop that knew what they were talking about.
Hi rjp996,

I changed ECU by £1200 last year (it was not new, it was a repaired ECU), drove now 24000 miles. Now, it seems that the problem has been reappeared.

Can you please provide the name and address of the garage who did the job for you so cheap? It seems that they are competent and cheap.

Kind regards.

Ohid
 

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Hi rjp996,

I changed ECU by £1200 last year (it was not new, it was a repaired ECU), drove now 24000 miles. Now, it seems that the problem has been reappeared.

Can you please provide the name and address of the garage who did the job for you so cheap? It seems that they are competent and cheap.

Kind regards.

Ohid
Hi All,

After pouring half a liter transmission fluid, the problem seems to be gone! Drove few hundred miles. Feeling better.

Have you got similar experience?

kind regards.

Ohid
 

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I have an A170 and my gearbox problem is a bit different!

The car drives and accelerates fine, no problems there!

When going from P to R or D no problem either!

But when you try to go back from D to R or P it simply does not! The lever is stopped like when it is locked! It goes to N ok and back to D and you can keep on driving.

If I turn off the key and back on (without starting the engine) the lever moves freely and then I can start the engine ok and put the lever in R.

Any suggestions?
 
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