R129 600 limp home after charging flat battery?

Discussion in 'Engine' started by 1380, Jan 7, 2017.

  1. 1380

    1380 New Member

    Messages:
    5
    Joined:
    Jan 7, 2017
    Car:
    SL600
    I have a 1996 R129 SL600 and I wonder if anyone has experience of the following problem.

    The car was garaged for about 2 months the battery was totally flat, not even a warning lamp. I could not open the boot but manage to find the main power cable up in the drivers foot well (RHD car), I charged the battery in place overnight, I did not jump start the engine.

    The following day the car started first time but now the dash is displaying the EPC and ESP warning lamps it also seems to be in a limp home mode as there is no power and is hunting on idle.

    The ABS warning was on for a while but has now extinguished it's self.

    Any ideas chaps?
     
  2. AndyRan

    AndyRan Hardcore MB Enthusiast

    Messages:
    151
    Joined:
    Jan 22, 2016
    Location:
    Kent
    Car:
    R129 SL 500
    Have you tried to move the car? The ESP and EPC may need to see movement on the wheel speed sensors to re-calibrate.
     
  3. CabrioDave

    CabrioDave Hardcore MB Enthusiast

    Messages:
    243
    Joined:
    Dec 18, 2016
    Location:
    West Midlands, UK
    Car:
    A124 E220 Cabriolet
    ABS light coming on is consistent with low voltage. It would go off again once the voltage is high enough to operate the system.

    Is the battery now fully charged? If not, get it fully charged.

    If it is, I'd be tempted to drive it, carefully, a few miles, then stop and turn off. Wait a few minutes and try again. It's not guaranteed, but it can reset a few of the reasons for limp-home.
     
  4. OP
    OP
    1380

    1380 New Member

    Messages:
    5
    Joined:
    Jan 7, 2017
    Car:
    SL600
    Thank you both for taking the time to reply.

    I drove the car only a mile, stopped for five minutes then a mile back again, I will try a longer run tomorrow, I will also check the battery voltage running.
     
  5. Oldlae

    Oldlae Active Member

    Messages:
    86
    Joined:
    Mar 9, 2016
    Location:
    Merriott Somerset
    Car:
    S204
    I would call MB about the problem, you may need the computer reset.
    If you spend more that 30 minutes changing the battery on a BMW Z4, the car goes into 'Transport Mode' and costs £££'s at the dealer to reset.
    Tony
     
  6. alabbasi

    alabbasi Hardcore MB Enthusiast

    Messages:
    937
    Joined:
    Feb 18, 2008
    I experienced a similar problem with my old 97 E420 several years. I did not charge the battery and the car started without problems, the weather was just cold.

    When I it took it to the dealer, they indicated that all systems were throwing low voltage codes and suggested that I replace the battery. You may have enough amps to crank the starter but not to run all the systems. I would put a new battery in it first. It usually costs less than paying MB to do the diagnostics.
     
    Last edited: Jan 7, 2017
  7. BTB 500

    BTB 500 MB Club Veteran

    Messages:
    17,780
    Joined:
    Aug 7, 2005
    Location:
    Berkshire
    Car:
    R129 SL500, W639 Vito 120, S203 C230
    If the battery has been standing discharged for any length of time it's probably had it.

    I had rollbar and window faults on my 500 due to low voltage - these had to be cleared via STAR. A maintenance charger is a great investment if you've got mains power where the car is parked - mine is kept on one permanently now.
     
  8. 190

    190 Hardcore MB Enthusiast

    Messages:
    2,118
    Joined:
    Mar 4, 2015
    Location:
    Cheshire
    Car:
    2009 W204 C180K

    This is a good question.

    It depends on the battery charger. A small charger will not fully charge a flat battery overnight. It could easily take 2 or 3 days depending on the size of the battery. Driving the car won't fully charge it either unless it's a very long run. Once the battery is fully charged and rested for several hours it should have a no load voltage of 12.7 volts or more depending on battery type.

    When making a judgement of the charge voltage while driving, the battery should also be fully charged. If it isn't that will tend to drag the charge voltage down and the lower reading may make you think there is a problem when there isn't.
     
  9. OP
    OP
    1380

    1380 New Member

    Messages:
    5
    Joined:
    Jan 7, 2017
    Car:
    SL600
    I have just got in from checking the batter voltage, after an engine off period of 3 hours I am seeing 12.6v, running I have 14.7v.

    One other observation is that the MPG gauge is stuck on maximum with ignition off and engine running?

    EPC and ESP light are still illuminated, LHM, and erratic idle over around 1000rpm.
     
  10. LvR

    LvR Member

    Messages:
    55
    Joined:
    Apr 18, 2014
    Location:
    South Africa
    Car:
    A160 W168
    Battery seems to be ok then. I would disconnect the battery (remove pos or neg terminal) and let the thing sit while you have a beer. Come back and reconnect the terminal and see if anything changed.

    Charging from totally flat, the battery voltage would have gradually increased iso being above an expected minimum level. During the increasing stage you may have tripped a lot of funky settings that just need to get reset:dk:
     
  11. OP
    OP
    1380

    1380 New Member

    Messages:
    5
    Joined:
    Jan 7, 2017
    Car:
    SL600
    Solved!

    I left the charged battery disconnected overnight, before reconnecting I touched the negative terminal to the for several seconds. The engine burst into life with all warning lamps extinguished and full power.

    Thanks to all the above for your kind help.:thumb:
     
  12. LvR

    LvR Member

    Messages:
    55
    Joined:
    Apr 18, 2014
    Location:
    South Africa
    Car:
    A160 W168
    :bannana:
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.