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Copyright © 2009 ATSG
AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
HOW TO READ THE MERCEDES DTC CHART
DTC Column
DTC "INT" Column
DTC OBD Column
"Limp Mode" Column
"Auto Reset" Column
"Key Reset" Column
All 1 or 2 digit DTC's between 2 and 65 are actual Mercedes fault codes at the time of code retrieval.
All DTC codes higher than 96 are fault codes that occured previously, or Intermittently.
Example:
A code 2 that occured previously would be displayed as 98 (2 + 96).
All codes in this column are OBD II codes that are found in the U.S. only, on OBD II compliant vehicles, and are
equal to the Mercedes 2 digit codes.
An X in this column means that it is a code that puts the transmission in "Full Limp Mode", transmission does
not shift, remains in the same gear as when the fault occured. After moving the shift lever to the Park position,
cycle ignition to OFF, wait 10 seconds and restart engine. Transmission will now be in 2nd gear (3rd gear some
models) and reverse will be available. To restore transmission function, if the fault is nonexistent, you must use
the proper scanner to clear the codes, cycle ignition to OFF and restart engine.
An A in this column means, Limp Mode only when faults 22 and 23 occur simultaneously. With implausible
input, TCM defaults to a pre-programmed, fixed, substitution value, (L/RR, R/RR = 2500 rpm).
A B in this column means, with implausible signal input, TCM defaults to a pre-programmed, fixed
substitution value.
A C in this column means, with implausible signal input, TCM defaults to a variable substitution value, with
loss of one rear wheel speed sensor input.
A D in this column means, with implausible signal input, TCM defaults to a variable substitution value, from
other half of engine control.
An E in this column means, delayed starting.
An F in this column means, fault induces TCM to re-initalize from beginning, or reset.
An X in this column means that it's a code that will automatically be eliminated, after fault condition ends.
An X in this column means that it is a code that can be eliminated by cycling the ignition key OFF to ON.
DIAGNOSTIC TROUBLE CODES (DTC'S)
We have divided the DTC charts into two different
catagories. The Mercedes chart which covers "all" of
their known codes, beginning on Page 30 and the
Daimler/Chrysler updated OBD-II code chart
beginning on Page 32.
The Shift Lever Assembly (SLA) specific codes are
shown on Page 31.
The Mercedes code chart can be very confusing at
times, so we have provided some "instructions" or a
legend to assist you in understanding the chart.
Please read or refer to the instructions below before
you go to the Mercedes code chart. The
Daimler/Chrysler OBD-II code chart is a typical
OBD-II code chart and they have refined the the code
descriptions.
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