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*Registered
2001 SLK320
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253 Posts
Discussion Starter · #1 ·
Hello all. I am new here and hope I'm in the right area.
I have a SLK320 I just bought. It sat for about a year but I just got it running today.
I took it on test drive and noticed it stayed in what seemed to be first gear. Even if I push shifter to plus side still only first gear..
Hoping to get some info on this.No check engine light on but it has ABS lights on and srs light on
Thank you
 

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*Registered
2001 SLK320
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253 Posts
Discussion Starter · #2 ·
I checked auto trans fluid with a dip stick I have for my C230 and with car running in park at 50°c I see nothing on the stick. This car sat for little over a year. I'm amazed it drove in first gear. Now my question is.I googled type of fluid I can use for my SLK320 and one choice was.
Castrol - Transmax ATF Full Synthetic Multi-Vehicle Automatic Transmission Fluid.. Is this ok to use? Or Valvoline max full synthetic ?
 

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2001 SLK320
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253 Posts
Discussion Starter · #6 ·
Your shifter might be going batty. Is the D or gear number disappearing from the dashboard?
I don't have a display on dashboard only on base of shifter. They are lit up.
Should this model have display on instrument panel?
Are you quite sure that you have a long enough dipstick? It is bottoming out in the sump yes?
Thanks for reply..It seems to bottom out and when I pull it up and out there is a very tiny amount on end
I'm going to try putting some trans fluid in today.
A couple quarts. And see what happens.
 

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*Registered
2001 SLK320
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253 Posts
Discussion Starter · #8 ·
Ok I tried to drive car today as I added trans fluid. Car backed up fine and drove 10' and then all of a sudden no response from gas pedal..I could pump pedal and nothing.. Car would go into drive or reverse but pedal did nothing.So I turned car off and started it up again. Then pedal worked as everything was fine.
Anyone know what's going on here? .
Would appreciate any help thanks
 

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*Registered
1997 SLK230
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506 Posts
The no shift could be due to low fluid but it could be in limp home mode due to the other issues turning on the SRS and ABS lights. I had exactly this happen on my 1997 230. It turned out to be a faulty K40 relay module. I would recommend getting the car on SDS and see exactly what faults you have before throwing parts at it.

Sent from my SM-T290 using Tapatalk
 

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*Premium Member
2001 SLK320
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1,753 Posts
Ok but once they fail shouldn't they stay that way? Why when I restart car it goes back to working fine?
Would it be sensor or ?
The pedal is an electronic sensor. As with anything electronic they can develop a mind of their own. A fair few threads about this on here.
 

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**Premium Member '02 R170 SLK V8 5.0 & '00 SLK320
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7,861 Posts
IF ABS light is on the TCU will likely not shift the Transmission as it needs to see Wheel speed info from ABS Sensors ;)

also agree with @borris1954 The ABS / ESP relay inside the K40 also powers Auto Boxes TCU ;)

Get it diagnosed on SDS before wasting tons of money on Parts Darts (y)
 

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*Registered
2005 SLK200K
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209 Posts
Ok but once they fail shouldn't they stay that way? Why when I restart car it goes back to working fine?
Would it be sensor or ?
The problem might be intermittent. The problem might be intermittent enough such that the local device computer (like in a shifter) or the ecu itself can still figure out the real world signal, say, coming from a electrically noisy pedal, and the car still runs like normal. Until it gets so bad that the computer says “i give up” and raises an error code and puts the car in a state where it thinks is appropriate (Limp, no operation at all or just a warning). Expect to find useful info when you get to download the error code. Restarting the car sometimes will allow the local computer to try the whole cycle again. But whatever the problem is, it’s likely to get worse and worse.
i hope you can still manage to drive the car to get it analyzed. If you’re a diy you can consider buying an iCarsoft for about 150 usd. not sure if your model has a standard obd port though.
 

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*Registered
2001 SLK320
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253 Posts
Discussion Starter · #15 ·
Thanks for all the great advice and yes I have an OBD2 tester when I check car it had 5 codes. PO500 PO141 PO446 PO600 PO450. Nothing about the pedal sensor. The one that stays on is the PO500 guess I'll start by replacing speed sensor and see what happens.
I will check the K40 relay. Where is that located btw?
My scanner can do live data also.
I guess that's why car was only 500.00 A lemon lol
 

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**Premium Member '02 R170 SLK V8 5.0 & '00 SLK320
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7,861 Posts
At 500.00 it's not a lemon, it is a cheap car for fixing up that will need repairs. Very worthwhile exercise if you can do the repairs yourself with help from myself and the other experts on this Forum ;)

OBD readers are no good on these cars. If you keep getting P0500 yes that is a Vehicle Speed Sensor, but on Mercedes and a lot of cars, it senses Vehicle Speed from the four Road Wheel Speed Sensors, i.e. ABS Sensors, so you need to know which one. Bearing in mind that particular Code it is unlikely you have a K40 issue.
Still need proper diagnosis before opening wallet though ;)

Your code is just a generic Code generated by an OBD reader that it seems is only accessing the Engine ECU, which is only receiving a CAN Communicated Error from the ABS / ESP Module ;)

I don't advise guys using SDS for fun lol ;)

In the instance of ABS / ESP you get lucky, because any half decent garage should have a Snap On, Launch, Bosch, Autel etc brand machine and that will access ABS / ESP to tell you which Sensor or it's Circuit is duff ;)

HTH (y)
 

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*Administrator (Premium Member)
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40,843 Posts
Whether a failure becomes permanent, or intermittent very much depends on why it is failing.
Breakage would be permanent, weakness prior to a break would be intermittent, before eventual failure.

Best example of intermittent would be the old filament bulbs at home. Sometimes they flicker before eventual failure.
Other times they just blow.

Oxidised contacts on connections and fuses loose connection, dodgy earth, can be intermittent.
 

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*Registered
2001 SLK320
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253 Posts
Discussion Starter · #18 ·
At 500.00 it's not a lemon, it is a cheap car for fixing up that will need repairs. Very worthwhile exercise if you can do the repairs yourself with help from myself and the other experts on this Forum ;)

OBD readers are no good on these cars. If you keep getting P0500 yes that is a Vehicle Speed Sensor, but on Mercedes and a lot of cars, it senses Vehicle Speed from the four Road Wheel Speed Sensors, i.e. ABS Sensors, so you need to know which one. Bearing in mind that particular Code it is unlikely you have a K40 issue.
Still need proper diagnosis before opening wallet though ;)

Your code is just a generic Code generated by an OBD reader that it seems is only accessing the Engine ECU, which is only receiving a CAN Communicated Error from the ABS / ESP Module ;)

I don't advise guys using SDS for fun lol ;)

In the instance of ABS / ESP you get lucky, because any half decent garage should have a Snap On, Launch, Bosch, Autel etc brand machine and that will access ABS / ESP to tell you which Sensor or it's Circuit is duff ;)

HTH (y)
Thank you for reply.
Yes a lemon lol but I did get good deal.
And I'm glad you guys are here to help. I appreciate it very much.
I am a mechanic but mostly Domestic not much for import. I guess at least I have mechanical knowledge.
I'm hoping to narrow it down to what speed sensor and I'm guessing the bad response or little response on pedal sensor could be due to these other problems.
I know throwing money at the problem could get costly..
Since it's a project. I'm going to take advice from all on here and do what I can.
I do have one question. Bear in mind I'm not very savy on Mercedes.
What is SDS? Some kind of tester?
 

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*Premium Member
2005 SLK55 AMG /2005 SLK350
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6,661 Posts
It's the dealership-level diagnostic tool, runs on a Windows laptop and there is a "mux" you need to use it. For your project, it will be well worth the cost to buy a clone - even though it will probably slightly exceed the purchase price of your car. Talk to i860 when you're ready to pull the trigger. For some repairs you can get away with a lesser product, but if I were you - SDS.
 

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*Administrator (Premium Member)
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40,843 Posts
In a nutshell, SDS is MBs own version of a scanner.
Generic scanner will do some work, but SDS will talk to all the ECUs.


Not sure if I already posted this, but it is a good resource for a beginner working on the 170s.
 
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