You saved me. I was literally shopping online for a new car when I discovered this. I had replaced the crank sensor, had someone put in a new starter, and replaced my battery. This was my last hail mary. I have buddy who's a welder. I sent him this video and he said he soldered and had a shop, he came by, grabbed the box, took him literally ten minutes and its cranking. Thank you so much!

Paul: I bought my beautiful Crossfire about two months ago. 2004 with 65K miles! very nicely kept. I was really disappointed this morning when the car wouldn't start but had a full battery. all accessories were live but it wouldn't crank or start!! I fortunately found your great video this morning. I got home from work, took out the RCM, fired up my soldering arm and made the repair as you directed. put it back in and VOILA! the car starts like a charm! couldn't haven't done it without you. Took about 20 minutes total!! Thanks again!!

thanks from NZ, got on my MB-slk230 today, battery and their terminals all good, but no cranking starter, radiator fan on full spin, watched your u-tube video, fixed in under half an hour, , mine looked oxidized on the right of the 3 terminals of the top left connector ... same place as yours ... glad this happened at home ) ... kudos

I've seen couple videos but that's a proper explanation, last pictures are very helpful to see the problem

A very easy video to watch very informative and well spoken person

Excellent presentation. Clear, easy to follow and thorough. Great job! Thanks for posting. I did this job a few years back, but it was fun to watch someone else do it well.

Wow! Thx you. This was as huge problem for along time when noone knowing what the problem was. AND then came you. I'm sooooo grateful. Thx you! Thx you!

Thanks for this. From your clear instructions I insected conformed issue, bought a soldering iron kit and fixed in minutes. BTW, a Mercedes Benz SLK, same K40 relay.

THANK YOU VERY MUCH you saved $$$ at Chrysler dealership!

Good video. I tried this but unfortunately my car had a cracked track and couldn’t be resoldered. So I had to get another one, second hand but after this video it was easy to install.

Thank you so much. I knew it was a relay, when I saw the box

Excellent video very informative thank you very much. A new K40 relay module at today's price is £167 in the UK. They have loads in stock so lets hope more people see your videos and save a bundle :)

Paul, Thank you for the presentation 📽️📹. It was precise and allowed me to see what soldering 🧨had to be done and😮 the steps you went through as you soldered. 🔥The pics 🤳of the before and after were a big help! 👍🏽✅📽️ Again, thank you for the time ⏳it took to put this presentation together! 😃

Worked like a charm! Thank you!!!

Thank you for your brief and precise explanation, It solved my problem.

Best to disconnect battery neg terminal when you remove/replace a bad multi-relay module like this K40.

Thanks so much cost me just $40 for someone to solder! Regards Tez from Perth Western Australia!

Thank you for your talent and sharing.

Very helpful video! Thank you!

Appreciate all the info ..my clk 350 ran out of gas and now it won't start .. like its a fuel filter or fuel ..im hope a sensor due to I didn't try to give it gas while it was low

thank you this helped a lot and saved me a couple 100 so thank you💯💯

Thank you so much for this valuable video! Thank you

thank you so much to this guy and to youtube. This works 100 percent i just try it on my 2001 mercedez slk 320 v6 Thank you so much you save me alot of money....

Thank you. It worked. 2001 slk 320

Out here doing God's work!!

so i just got that problem with my 2002 slk 32 amg. and because of your video i knew exactly were to look. and sure enough i used a magnifying glass and i could see that the soldier wasn't touching the metal stems.. so after re-soldering those 3 spots the car is now starting again.. thanks man...no way would i have figured it out on my own...🙏

Thank you for show this video

Thanks Paul.

made this repair still no crank no start slk230 kompressor 2001

Thank you very much , i fixed the problem in 15 min , thanks to your video

Checking out relays while it was out is a good practice. Inspecting for dirt or burned/wear on contacts for cleaning or replacement.

Greetings from Bundaberg. Maaaate, you are brilliant. Exactly what was wrong with my Crossfire. I soldered it this morning. FIXED, Thankyou, Thankyou. 😂 P.S. my mates drivers side window don't work, any ideas.

Common Faults leading to START ERROR on with certain Mercedes Benz: Jump starting Battery power not sufficient The transponder in your key is faulty or missing Antena coil on ignition faulty ECU fault Fuel pump fault We also recommend testing for power on your WSP plug. Pin 3 is continuous +12V direct from the battery, Red/Yellow Wire Pin 7 is ignition +12V when your key is in position 1 and 2, Black /Yellow Wire If there is no power on either you will get START ERROR on the dash. Is from Asian website that uses Mercedes’ for there business blessed beings 💖✨

I had a issue with my negative battery cable. Stock cable clamp was only being held on by the rubber. Cut the end off. Installed a new clamp. Was giving me same issue as RCM. Had power (lights on). turned key then no power. Had to disconnect the battery to get the power to come back on.. I thought I had a broken battery post because if I put pressure on the cable it would start. Hope this helps someone else

Super!!! M.

I know this vid is old but it got me going again. Thanks 👍

I am subscribed too.

GREAT VIDEO! I HAVE A '98 SLK230 (NO HISTORY OTHER THAN IT JUST STOPPED RUNNING) THAT IS NOT ONLY NO CRANK-NO START, I HAVE NOTHING ON MY DASH EXCEPT THE KEY BUZZER....NO WARNING LIGHTS, NO NOTHING. WOULD THIS BE ANOTHER REASON FOR THE FAULTY RCM??? I HAVE ALSO BEEN MADE AWARE OF A "CRASH SEPARATOR" ISSUE. DO YOU KNOW WHAT THAT IS? MINE WAS KIND OF WIRED DUBIOUSLY SO I GOT ANOTHER. PLEASE LET ME KNOW YOUR THOUGHTS. THANKS

Easy way to unplug these wires is to use the little holes on top of the connecting plug. I use a paperclip insert one end into the hole and use pliers to pull it.

Thank you for your tutorials Paul! Keep it up

Seems a great life saver video and solution. I have a 2013 SLK and suddenly starter won't turn unless you run a direct wire from the battery. Could this have the same fault?

Thanks!

I have a c230 2005 Mercedes no crank no start not sure what it can be

Do you have a similar video for the indicator Relay module for a 1997 W210 E320? Need help with that repair.

You said silver solder and I would like something a little more exact. I have 0% experience in soldering

Is it the same with an a200 2005? I have same issue, no start, but relay is ok. Bridge relay will get engine to start.

Nice vid! Thx

I removed the RCM on my Crossfire and found the faulty solder points as per your video. I resoldered them, put everything back in place, and it still does the same thing...no crank, no start. When I keep turning the key on and off it will eventually start, run for a few seconds, then die. What should I do now?

Happened once last year. Hasn't occurred since. I'll use this for when it does! Thanks!

Hi, i have missfire at 3rd cly in my 97’slk230. I have changed plugs, coils, cables,cps and maf sensor . nothing changed. Service tried all but they say its about ecu. Do you have any suggest about it? Or did you heard about same problem before?

Hello, does the 2002 c320 sedan has this? I can't find it. SOMEONE PLEASE HELP ME!!

Thank you for the video. My car is 97 e320 and I do not see a relay like other E320s instead has this module that you have shown. Recently was stranded in the highway ended up toeing the car home. Car would crank but would not start. Later after the car was toed home, I cranked this time car did start and running fine. Does my problem could be the same as you shown? I did not dare to drive the car since. You said this is for no crank and no start. But mine did crank but did not start in the freeway. Planning to replace CPS and Fuel filter.

Hi and thank you for your videos. They’ve been quite helpful. I have all four crossfire I ordered the area told me for the secondary air pump and that works fine now I now been getting a code of P0600 on there Car starts and runs but I have all my lights on on the dash and I’m having problems with the admissions passing the car If I disconnect the plugs and reconnect them, it seems to reset everything in the car runs fine with no lights but after a while they come back. Have you seen anything like this? If you like to talk I can send my # Thank you in advance if you can help me with this

You have to make sure you dond solder across the seperate connections

Ok this good

Is this procedure also clear the P0410 code? Car turns on no problem?

Hello Paul ; great video. I saw the video you did of this problem just over a year ago. Problem solved. Just for my information, just in case I have conversations with other crossfire owners who haven’t had this problem “Yet”; what years crossfires did this affect? All years ? Also, did this affect SRT6 models ? Thanks ....Your video saved me hundreds. It cost me $3.00 to fix my 2005 Crossfire convertible. One more question; I’ve had my crossfire for over 13 years and have just over 111,000 miles; when do you recommend a timing chain change and water pump change ? Thank You Buddy , Mike from California.

Thanks, Paul. If the solder on the 3 sites touches/contacts each other, is that going to be an issue??

Hello my crossfire sometimes does not work when I push the gas pedal, turn it off for one minute then works normally after 1 hour or less I have the same problem can you help me? Great video by the way

I really hope you see this. I’ve been having trouble with my xfire for the last few months goin on a year.. my abs esp hand brake light and and brake wear indicator are constantly on. My speedometer won’t work and my spoiler is stuck deployed I’ve been trying to figure it out myself but I need a high level of expertise to try and attack this one.. I have no problem doing the work myself as I keep all the cars in my household maintained

My 01 clk 430 is having this problem. Is it the same for mine?

Hi Paul, do you know where is the wiper motor relay located. Thanks!

The crossfire is the slk 320.??is the repair the same for the Slk 230. ??

I have a mercers benz 1999 s320 no start no crank

Fantastic Edification!

Another fix to your credit.

Good video, but didn't solve my no start, no crank issue.

my key/fob broke trying to get a new one from dealership -i would like to hot wire my X F up to get it to run any help

I have the same issue can you help me out

Would this cause the car to stall while driving also? I have a 2006 S500 and I have the no crank and no start issue as well as the car stalling while I'm driving. Changed the crankshaft position sensor and it still happens. No engine light or error codes.

I tried this fix but not cured my problem it locks and opens off the key fob but no fuel pump or starter motor been standing with no battery fitted for 6 mths

Tried it,change for new one, still does not turn??

Hello I'm looking for help, my 04 cross fire it crank but don't start, what will you think it the problem. Thank you very much, I hope you read my comment.

have any suggestions on a corroded battery cable? The CHRYSLER dealership said they don’t make the cables anymore & they’d have to jerry rig a new battery cable compartment😩😩😩live my car, hate the thought of loosing it due to the dealership wanting almost $1,000 to fix

BUT DOES THIS STOP IT FROM OVER HEATING THIS IS THE CODE I GOT. BUT MY CAR IS CRANKING JUST NOT STAYING COOL.

Mine cranks but no start, neither will it start with starter fluid.. wat noww

I tried this and it wanted to start but would not keep running then it stopped all together what do I do now ?

I'll be driving my '05 Crossfire (at any speed) with no problems, and then it will just suddenly die. When it does and I coast to a stop, then it won't crank and won't start. After a few minutes of waiting and turning the key on and off it will start but do the same thing again as I drive. Will the solder fix also apply to this condition?

🤜🏽🤛🏽💗

Hi can you help me there a light that come on where the mileage shows and it flashes a little oil can saying hi do you know why this is happen never b4 ??

Having issues my car will not go over 50 mph stalls

Is there another place I can look at.

I’m not too sure what’s the best method of contact but if you can help me or attempt to please message me back I’m not sure how to send private messages on KZfaq if it’s even possible if not you can send me a dm or Facebook ig or Twitter.. I’ll send my username if you would like to assist me finding out this issue.. I’m a film maker and I can document it all for anyone else who might encounter the same error so that way they can have a way to fix it

I have a 05 230k no crank no start someone please help

you didn't start the car so that we could prove that your theory worked