SL55/63/65/R230 AMG: Car shuts and has to be restarted constantly
Thread Starter
Junior Member
Joined: Jul 2008
Posts: 29
Likes: 2
From: San Diego
r230 sl63, 2002 clk55 Cabrio
Car shuts and has to be restarted constantly
Driving along sudden loss of engine and have to shift to neutral and restart her. Happens more and more frequently till had to stop driving. Almost like battery terminal loose. No warning or error messages. Any ideas?
2011 sl63. Head bolts replaced.
2011 sl63. Head bolts replaced.
Last edited by DJAC; Dec 18, 2022 at 12:41 PM. Reason: adding vehicle
MBWorld Fanatic!
Joined: Sep 2007
Posts: 1,481
Likes: 310
95 SL600
This really could be numerous problems, but battery terminals and crank position sensor are the first that come to mind. The CPS usually fails when hot and won’t allow restart though. If you have limited mechanical skills, a specialist is your best bet.
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Joined: Jun 2008
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From: Texas
2003 CL55
Crank position sensor is common for this kind of symptom but can be other issues , like fuel too. I scanner can help you isolate quickly vs changing out parts.
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
Thread Starter
Junior Member
Joined: Jul 2008
Posts: 29
Likes: 2
From: San Diego
r230 sl63, 2002 clk55 Cabrio
Would it shut down instantly with a fuel shortage?If the car senses lack of fuel and shuts down then there should be a record or even CEL? If there is simply no fuel to the engine would there be a misfire.
My Indi wants to keep the car for a few days and run it with a fuel sensor attached. Replaced the CPS just to check - no change. Its now with dealer to reflash the entire car to latest/last, as a first step.
My Indi wants to keep the car for a few days and run it with a fuel sensor attached. Replaced the CPS just to check - no change. Its now with dealer to reflash the entire car to latest/last, as a first step.
Newbie
Joined: Dec 2022
Posts: 3
Likes: 0
E63, SL55
Would it shut down instantly with a fuel shortage?If the car senses lack of fuel and shuts down then there should be a record or even CEL? If there is simply no fuel to the engine would there be a misfire.
My Indi wants to keep the car for a few days and run it with a fuel sensor attached. Replaced the CPS just to check - no change. Its now with dealer to reflash the entire car to latest/last, as a first step.
My Indi wants to keep the car for a few days and run it with a fuel sensor attached. Replaced the CPS just to check - no change. Its now with dealer to reflash the entire car to latest/last, as a first step.
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Thread Starter
Junior Member
Joined: Jul 2008
Posts: 29
Likes: 2
From: San Diego
r230 sl63, 2002 clk55 Cabrio
Well, both my indi and dealer could not find any fault nor recreate the issue, so I'll start driving her again tomorrow and see if the re-flash made any difference, though I still suspect electrical at the ignition end or fuel as suggested. This issue is a PITA though.,
Thread Starter
Junior Member
Joined: Jul 2008
Posts: 29
Likes: 2
From: San Diego
r230 sl63, 2002 clk55 Cabrio
Nothing for 2 weeks then started again, sgut diwn 5 times on way hoe, 4 times going fast enough to force a restart, once after stopping at lights where it was resistant to re-start.. finally got her home and 10 minutes later the alarm went off, which would not stop till I put key in ignition.
One dealer mechanic thought it may be a loose wire/short on the push start/stop button on the transmission stick. It did have trouble starting after we stopped at the lights, no crank, but a few shifts neutral to Park and she got going again. I think it HAS to be the ignition system/key interface module. Each time it shuts down there is a squeak from dash, followed by all the dash lighting up. Still no CEL.
One dealer mechanic thought it may be a loose wire/short on the push start/stop button on the transmission stick. It did have trouble starting after we stopped at the lights, no crank, but a few shifts neutral to Park and she got going again. I think it HAS to be the ignition system/key interface module. Each time it shuts down there is a squeak from dash, followed by all the dash lighting up. Still no CEL.
Member
Joined: Jan 2003
Posts: 181
Likes: 18
From: Cedar Park, Texas
2013 Porsche 911 Carrera 4S, 2004 SL55, 2012 Lexus IS250, 2021 Toyota Highlander
I had a similar issue and in my case if was the crank position sensor located at the back of the engine. A bit of a pain to get to but a fairly easy change to do. Helps if you have small hands. I had my 11 year old help me out. Your symptoms were exactly as you described. It would just shut off at random. I had around 50k on my car when it happened. Hasn't occurred since.
Thread Starter
Junior Member
Joined: Jul 2008
Posts: 29
Likes: 2
From: San Diego
r230 sl63, 2002 clk55 Cabrio
Hmm, one of the first things I did was to replace the CPS, did not stop the problem, however, driving with the key in the ignition instead of using the push start/stop, so far all normal, which takes me back to maybe a loose connection within the S/S button.
Thread Starter
Junior Member
Joined: Jul 2008
Posts: 29
Likes: 2
From: San Diego
r230 sl63, 2002 clk55 Cabrio
