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SL-Class (R129) 1990-2002: SL 280, SL 300, SL 320, SL 500, SL 600, SL 60 AMG

SL/R129: Resistance too low

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Old Jun 10, 2024 | 09:59 AM
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kwelch02's Avatar
kwelch02
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From: Ann Arbor Michigan
1996 sl 500
Resistance too low
I have a 96 SL500. Car runs fine. Any help figuring out what the following means? Thanks in advance.

However, after running a code reader, I am getting the following under TCM - Transmission Control Module

120 Resistance Too low. (the accelerator pedal value of the engine system is sporadically implausible) or (the front right wheel speed of the traction system is sporadically implausible)

121 Plus, engine system is sporadically implausible or the front left wheel speed of the traction system is sporadically implausible

Plus, 118 resistance too low - the right rear wheel speed is sporadically implausible - 119 Same with rear left.
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Old Jun 10, 2024 | 04:38 PM
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vesiadog
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From: NE OHIO
1998 SL500,2011 GL550,2009 ML350,past 1995 E320 Cabrio ,2005 ML500,2006 ML500,1996 SL500,1972 280SEL
pictures of codes
Originally Posted by kwelch02
I have a 96 SL500. Car runs fine. Any help figuring out what the following means? Thanks in advance.

However, after running a code reader, I am getting the following under TCM - Transmission Control Module

120 Resistance Too low. (the accelerator pedal value of the engine system is sporadically implausible) or (the front right wheel speed of the traction system is sporadically implausible)

121 Plus, engine system is sporadically implausible or the front left wheel speed of the traction system is sporadically implausible

Plus, 118 resistance too low - the right rear wheel speed is sporadically implausible - 119 Same with rear left.
Do you have any pictures of the code reader info? what did you read the codes with?
What dash lights are on?
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Old Jun 10, 2024 | 04:46 PM
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kwelch02
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From: Ann Arbor Michigan
1996 sl 500
I red them with a:

iCarsoft Multi-System Auto Diagnostic Tool MB V1.0 for Mercedes-Benz/Sprinter/Smart with Oil Reset (Red)

No engine light


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Old Jun 10, 2024 | 04:50 PM
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vesiadog
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From: NE OHIO
1998 SL500,2011 GL550,2009 ML350,past 1995 E320 Cabrio ,2005 ML500,2006 ML500,1996 SL500,1972 280SEL
dash lights
Originally Posted by kwelch02
I red them with a:

iCarsoft Multi-System Auto Diagnostic Tool MB V1.0 for Mercedes-Benz/Sprinter/Smart with Oil Reset (Red)

No engine light

What lights are on the dash ? Are you reading this from the under the dash OBDII? Or the large round 38 pin reader connection under the hood?
Last edited by vesiadog; Jun 10, 2024 at 04:54 PM. Reason: wording
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Old Jun 11, 2024 | 06:04 AM
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ygmn's Avatar
ygmn
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From: New Orleans Area
2015 E400 Sedan
This is first year for ODBII
So code should start P0XXX and they are fixed by the ODBII specs

118 & 119 are coolant sensors issues
P0118 Mercedes-Benz Code Meaning, Causes, Symptoms, & Tech Notes (engine-codes.com)
P0119 Mercedes-Benz Code Meaning, Causes, Symptoms, & Tech Notes (engine-codes.com)

120 121 are throttle position Sensor
P0120 Mercedes-Benz Code Meaning, Causes, Symptoms, & Tech Notes (engine-codes.com)
P0121 Mercedes-Benz Code Meaning, Causes, Symptoms, & Tech Notes (engine-codes.com)

Now if they start with a different letter it means different things.
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