SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: Fault P2037-004 and P202F-004 HELP WANTED

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Old 11-30-2023, 07:17 PM
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SL 500 2004, Ford F-150-2014
Fault P2037-004 and P202F-004 HELP WANTED

Gentlemen, After having issues with a bad rear battery, replaced the battery and soon later I started getting a Check engine Light...I cannot speculate if that is related or not, but the description of the fault is as follows:
Vehicle runs normal with a little hesitation when accelerating without changing to the lower gear.

P2037-004 No or Incorrect CAN message from control unit N15/3 (ETC [EGS] control unit) Communication fault/ See also CAN status in freeze frame data (P0600)
P202F-004 CAN message from control unit CGW or EZS is missing or faulty. Communication fault/ See also CAN status in freeze frame data (P1999) or
no or incorrect CAN message from control unit N51/2 (ABC control module) Communication fault.

I wonder if anyone have come across to such fuzzy description. So far I am lost around that terminology..!

Your help as always will be greatly appreciated!
Old 11-30-2023, 09:44 PM
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2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Have you cleared these codes yet to see if they return?
Old 12-01-2023, 07:31 AM
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'03 SL55 Black, '03 SL500's Aegean, Mars Red, Tazanite, Alabaster, '11 S550 Flint Gray
Those would both be high speed CAN (CAN C). Check the CAN C hub in the driver's side footwell for corrosion.
Old 12-01-2023, 09:48 AM
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Thank you Mike, I'll check for that! Any pics on specific location and how it looks like??

Jettared, yes, I have cleared the codes few times and have isolated the two intruders.!
Old 12-04-2023, 12:21 PM
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Mike, digging into the subject I could see that the two modules addressed by the DTC's are branches of the CAN C, but the document I got
tells that the connector is in the driver's side door sill.!




Old 12-04-2023, 01:03 PM
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'03 SL55 Black, '03 SL500's Aegean, Mars Red, Tazanite, Alabaster, '11 S550 Flint Gray
Yes left side of the floorboard. Not really IN the sill, beside the sill on the floorboard. Green wires are CAN-C, brown wires are CAN-B.

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