Famous No Crank and No Start 😐 it's the RCM and not the battery nor the fuel pump

Car will not start nor crank over? Before you bring it to a shop for expensive diagnostics or repairs try this simple and well proven repair. Do yourself another favor, do NOT buy a new RCM Relay Control Module repair as many of them were produced at the very same time as the ones installed in your car with the very same poorly soldered at manufacturing time.
Other option is you can send me your RCM with a self mailing envelope and I can fix it for you for only $40.00 USD see my address in the "ABOUT" button on my main page
To donate to the channel, please go to
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[@justindefensible3124]

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!

[@CrossfireRepairsByPaul]

glad I could help

[@justindefensible3124]

@@CrossfireRepairsByPaul AND, the Check Engine Light which has been on as long as I've owned the car also disappeared. Thanks so much. BTW, the check tire light stays on but all 4 tires were replaced last year. It has pretty much been on forever too. Any idea what that may be or do you have a video where you've addressed that?

[@CrossfireRepairsByPaul]

@@justindefensible3124 either low or too high tire pressure or one or more of the TPMS is not being read by the cars computer this giving you a check tire icon on the dash

[@justindefensible3124]

@@CrossfireRepairsByPaul craziest thing. I was just driving home and my car cut off AGAIN…I opened the place where the RCM box is, wiggled the wires basically and it cranked! I barely made it home to the top of my street and luckily coasted into my spot in front of my house. I’m afraid I not gonna be able to trust the car again now. Just had to share.

[@CrossfireRepairsByPaul]

@@justindefensible3124 have you changed the CPS Crank Position Sensor (use BOSCH brand ONLY)

[@deepapo]

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

[@CrossfireRepairsByPaul]

Thank you!

[@russthomas4992]

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!!

[@antdavisonNZ]

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

[@favoritasdegeorge]

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

[@Engineerboy100]

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.

[@CrossfireRepairsByPaul]

Glad it was helpful!🙂

[@Venezia1110]

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

[@DavidOliverPowley]

All same symptoms are being described here as I have with my SLK at the moment. I gonna try this tomorrow. I will post the results.

[@terrywellborn3194]

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

[@CrossfireRepairsByPaul]

Glad it helped! Hope you have subscribe to the channel! 😀

[@johncaiger5733]

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.

[@tonyarnold9784]

Have one and hope it works for me too

[@geniusggaming8423]

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!

[@brandiwatson7631]

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

[@CrossfireRepairsByPaul]

My pleasure! Hope you have subscribe to the channel! 😀

[@paulbroadbent9414]

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.

[@DM-hd4xm]

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

[@JohnHenry-er4wu]

Very helpful video! Thank you!

[@Edward3C]

Worked like a charm! Thank you!!!

[@kennethfoster2421]

Thank you for your talent and sharing.

[@jcamillegray]

Thank you so much for this valuable video! Thank you

[@frankhorton8221]

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! 😃

[@CrossfireRepairsByPaul]

You are very welcome🙂

[@tristenramirez1865]

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

[@scottschoenberger3957]

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

[@Gosportjohn]

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 :)

[@tonyarnold9784]

Unfortunately is hasn't worked on my SLK with same symptoms (no crank). Bought solder but no luck. Am reluctant to buy a new board BUT to get it to garage to look at is £160.....

[@cheyenneobregon184]

@@tonyarnold9784 how did you fix it?

[@tonyarnoldphotography9757]

@@cheyenneobregon184 I ended up replacing it! Car worked straight away. I had tried resolderi but had no effect. Mercedez said they replace loads of them.

[@cheyenneobregon184]

@@tonyarnoldphotography9757 where did you purchase? Did this fix your start error message as well? And how much did it cost??? Currently looking at one for 1500$ same issue!

[@tonyarnoldphotography9757]

@@cheyenneobregon184 I bought the K40 direct from Mercedez here in UK. It was about £176 (200$?). Car started straight away. A few weeks later hit another issue with key fob not turning. Lots of advice said it could be fixed. I took it out and couldn't see any issue. Wise man said change the steering lock. I got one from Mercedez and problem solved. There was nothing wrong with the key fob.

[@venomkingvenomking312]

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....

[@jonathansirmons7932]

Out here doing God's work!!

[@antoniolopez5384]

Thank you for show this video

[@kraigrichard7043]

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

[@lrobinson5291]

Thank you. It worked. 2001 slk 320

[@CrossfireRepairsByPaul]

Happy to help!

[@enmanuelporras2226]

Thank you for your tutorials Paul! Keep it up

[@sgbryant1962]

Thanks Paul.

[@CrossfireRepairsByPaul]

Happy to help buddy

[@ishmaelshumba920]

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

[@terrydoberstein6742]

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

[@russellhausler2241]

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.

[@CrossfireRepairsByPaul]

glad I could help. Check these fuse, switch, wiring, loom, window motor, actuator

[@jcr4345]

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.

[@janlantz3216]

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

[@russellhausler2241]

I am subscribed too.

[@FixCarYourself]

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

[@serdarb8560]

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?

[@zoemeow7677]

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 💖✨

[@frankpaslay5886]

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

[@Ialicea5840]

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

[@parlez-vousfrancais9731]

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?

[@tonyarnold9784]

Great...got the part out now, same as in SLK 200....now to buy the soldering equipment. Fingers crossed!

[@tomhuynh3173]

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

[@taduncan6614]

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

[@CrossfireRepairsByPaul]

Happy it helped!

[@SirSkud]

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

[@bumrush9422]

Thanks!

[@CrossfireRepairsByPaul]

My pleasure! Hope you have subscribe to the channel! 😀

[@Jaspertronic413]

Nice vid! Thx

[@CrossfireRepairsByPaul]

Thank you! Hope you have subscribe to the channel! 😀

[@siamak1]

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.

[@CrossfireRepairsByPaul]

Sounds like you have a bad Crank Position Sensor. See my other video on the matter car cranks but no start

[@siamak1]

thank you. Now It is the matter of finding it in the back end of my Straight 6 engine.

[@schnallobullo7067]

Super!!! M.

[@CrossfireRepairsByPaul]

Glad it helped! Hope you have subscribe to the channel! 😀

[@henrikklovmark]

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.

[@CrossfireRepairsByPaul]

Never worked on the 200, have a look to see what your set up is like and inspect all contact points

[@Emanual0607]

Fantastic Edification!

[@bernardhuther2832]

Ok this good

[@tswinter1]

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

[@CrossfireRepairsByPaul]

crossfire is the 3.2 litre 6 cyl, not sure if you have the same RCM but have a look

[@xixarock666]

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

[@CrossfireRepairsByPaul]

sounds like you have a bad throttle pedal position sensor kzbin.info/www/bejne/gpOrnqeliZZmhdk

[@mikeyincalif]

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.

[@CrossfireRepairsByPaul]

Hi Mike, this issue is on every model year, I have even done this on a few brand new RCM. Seems they were mass produced back in the day and are still selling these with the improperly soldered 3 sets of pins. As for the water pump. do an inspection for loose bearing, noise and leaks and change at the 1st sign of issue, The rimming chain is suggested to be changed at around 120K by most respected shops.

[@jackglover3235]

I have a question,I have a 2007 roadster crossfire I pulled it out one day for a ride with the top down hadn’t driven it for a while going down the road speedometer start going haywire car dyed battery was drained flat went and bought a new battery put it on and tried starting it and my new battery it drained it’ too have u heard of a crossfire with a problem similar too this any advice would be appreciated thanks

[@terrydenny1684]

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?

[@bradsnyder8802]

I am having the same issue. I checked/soldiered the terminals. No go. Cleaned the contacts on the relay. Worked well for most of the summer. Now back to intermittent issues. Thinking I need to replace the relay to start with fresh contacts. Good luck!

[@PXFilms124]

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

[@paulflores7021]

Hi. I'm having the same problem with my Crossfire. How did you fix and what was the problem. My dealer had a fix at the tune of $2 600. They said the problem was the steering wheel sensor and the relay.

[@PXFilms124]

Paul Flores glad you asked.. it’s crazy because I just got around to fixing it last month but my issue was 2 things. Faulty CAN bus wiring (2 wires, green & white 20 awg, it connects 4 modules in the manual and 6 in the auto) and a bad ABS module. The shop manual or scanner may refer to it as the CAB module but it’s the same thing and it houses both the ESP module and ABS Module, the ESP module is the cylindrical piece on the front of the silver brake disturber box and the ABS module is the flat black box on the back

[@PXFilms124]

You can fix it at home for $300 if both the CAN Bus and ABS module are your issue, but also note that could be other module within the system causing this issue.. I have a post on the forums about this issue and how I solved it. I’ll send the link

[@PXFilms124]

Paul Flores www.crossfireforum.org/forum/troubleshooting-technical-modifications/78828-bas-esp-abs-e-brake-brake-wear-indicator-light-all.html

[@billycav75]

Im having the same problem.

[@MariaGarcia-kf5od]

made this repair still no crank no start slk230 kompressor 2001

[@av8ndoc]

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

[@CrossfireRepairsByPaul]

yes, keep the solder separate from the other 2 pairs

[@youngc5884]

I have the same issue can you help me out

[@ACbyED]

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

[@CrossfireRepairsByPaul]

If you have the same RCM, I would check it as well

[@AlexLopez-iu8pr]

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.

[@CrossfireRepairsByPaul]

look at my other video kzbin.info/www/bejne/hajVcqqFi5aNZ7M

[@MrEdtheraiderfan]

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.

[@CrossfireRepairsByPaul]

Stalling while driving is a symptom of a bad CPS. I have seen many brand new cheap aftermarket CPS and fake BOSCH ones fail within days. Make sure you only buy BOSCH. While you are at it change your camshaft position sensor also with a BOSCH brand

[@MrEdtheraiderfan]

Thank you. I do only purchase bosch. I'll try the camshaft sensor next. I'll keep you updated. Thank you for the reply...

[@robertcarmichael9570]

Thank you from 2024. My 25 year old SLK starts once again!

[@cckleese]

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

[@CrossfireRepairsByPaul]

$1000 to replace a battery cable?? "Jerry rig" ?? take your car and leave that dealership...actually RUN!! Do yourself another favour and contact Rob over at Needswings email him at NeedsWings.com or call him 1-586-531-1413 10am-5pm EST. He can order you a new cable for the Crossfire for less than $20 and you should join my Facebook crossfire group at Chrysler Crossfire Owners International facebook.com/groups/2211655775/?ref=bookmarks

[@Sebasnonves2]

hello I have that ploblem mine sometimes does not turn on, you can send me an email to contact us, I am in Spain, thanks

[@user-gz8mm6jr9l]

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

[@donyavuaipompy6592]

I have a mercers benz 1999 s320 no start no crank

[@terrydenny1684]

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?

[@CrossfireRepairsByPaul]

Yes, no crank no start is the RCM, So the pin loose contact with the bad soldering job done at manufacturing level therefore loose the signal for the relay to keep the engine on, when you get a crank but no start then you look at the Crank position sensor (and only ever buy a BOSCH CPS)

[@terrydenny1684]

@@CrossfireRepairsByPaul Thanx!!! I plan on resoldering as per your video in the next few days. I'll let you know how it turns out.

[@eddieohearn17]

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

[@CrossfireRepairsByPaul]

lead-free rosin core solder

[@kbrickell4732]

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

[@Buzznut3000]

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

[@icenhourdad]

Another fix to your credit.

[@CrossfireRepairsByPaul]

Glad it helped! Hope you have subscribe to the channel! 😀

[@godchaser771]

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

[@PXFilms124]

danny dryden could possibly be your SKREEM module. Does the car start and then die after a few seconds or struggle to start and sputter out ? If it’s the first option its more than likely something to do with that system.. either the key’s chip or SKREEM itself may need to get replaced

[@freddysnrwilliams4168]

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 ??

[@mikeyincalif]

I had that happen to me; I found that that is the maintenance reminder. I changed my oil, and reset it for 7,000 miles since I use full synthetic oil. Go on KZbin and type in Crossfire maintenance reset. That’s where I found it. It may have even been a Paul who had the video. Hope this helps.

[@jpnadeau6580]

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

[@waynestocking4782]

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

[@stevecordell9144]

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

[@CrossfireRepairsByPaul]

re-soldering will fix the No Crank and No Start, it will not affect your cooling system, you need to look to see if your fan is working. check the fan fuses 1st, check your fluid levels next, then the fan to see if it turn on when the car get to running temp.

[@jpnadeau6580]

Is there another place I can look at.

[@CrossfireRepairsByPaul]

please describe all symptoms your car has

[@jpnadeau6580]

@@CrossfireRepairsByPaul Put the key on ,turn all lights goes on but no crank, Change the module still does not turn.

[@CrossfireRepairsByPaul]

@@jpnadeau6580 this fix if if there is "no crank and no start" look at my Crank Position sensor video, that is when your car cranks but wont start

[@jpnadeau6580]

It doesn't crank at all (turn) and all lights turn on.

[@CrossfireRepairsByPaul]

@@jpnadeau6580 if you unplug the car battery for about 15 seconds then plug it back then see if it cranks.

[@albertosantillano1965]

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

[@mikeyincalif]

Did you watch Pauls Video. Watch it. Very good chance it’s the problem. Very easy fix.

[@CraftGodsOfficial]

🤜🏽🤛🏽💗

[@daironmarrero1398]

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

[@CrossfireRepairsByPaul]

look at my "Car cranks but won't start" video

[@PXFilms124]

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 KZbin 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

[@joshuajackson9116]

Having issues my car will not go over 50 mph stalls

[@CrossfireRepairsByPaul]

Hi Joshua, change your Crank Position Sensor (CPS) to a BOSCH brand only! see my video on Crank Position Sensor

[@joshuajackson9116]

@@CrossfireRepairsByPaul hey question for you people say it's the ECU. Is this possible?

[@CrossfireRepairsByPaul]

@@joshuajackson9116 it sure can, but I would start with a $25 part before moving on to the ECU, Process of elimination by cost ;)

[@joshuajackson9116]

Thanks ok I'll try that first

[@moses3296]

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