C63/GTx 177/178 Check Engine Light on
with Misfire DTC's. Engine Running Roughly
Topic number

LI54.21-P-062006

Version

5

Function group

54.21 Control units / basic modules

Date

05-11-2018

Validity

Model 190.3##
Model 190.4##
Model 205.#8#

Reason for change

Typo on step numbering

Reason for block

Complaint:

Engine running rough / Fault code entry
Possible fault codes:
P030885 - Combustion misfiring of cylinder 8 was detected.
P030285 - Combustion misfiring of cylinder 2 was detected.
P030785 - Combustion misfiring of cylinder 7 was detected.
P030185 - Combustion misfiring of cylinder 1 was detected.
P030585 - Combustion misfiring of cylinder 5 was detected.
P030385 - Combustion misfiring of cylinder 3 was detected.
P030485 - Combustion misfiring of cylinder 4 was detected.
P030685 - Combustion misfiring of cylinder 6 was detected.
P030022 - Combustion misfiring was detected

Cause:

Diagnostic data too sensitive.

Attachments
File

Description

IMG_3273.JPG

Example image of ceramic damage on spark plug

20150609_105958.jpg

Example image of electrode damage on spark plug

Remedy:

Perform the Following:
1) Smoke test intake/exhaust and check for leaks. NOTE: The intakes to the turbochargers as well as the tubes from
the turbochargers to the intercoolers must be tested.
•
Repair as necessary.
•
If no leaks are found, or repair does not remedy complaint proceed to step (2).
2) Inspect ignition coils and verify they are PN: A 177 906 95 00.
•
Replace as necessary.
•
If all coils are PN A 177 906 95 00 swap the coil(s) of the misfiring cylinder(s) with those of cylinder(s) that are
not misfiring and road test the vehicle.
•
If the misfires move with the coils, replace the coils and the spark plugs on original misfiring cylinders
05-11-2018 8:52 PM
© Copyright Daimler AG

HENRAND

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•
If the misfires do not move with coils, proceed to step (3)
3) Perform a Xentry guided high pressure fuel test from cold start and obtain the injector performance data, and initial
quick test with fault freeze
•
If the test fails for either bank, replace the high pressure fuel pump for that bank.
•
If the test passes for both banks, road test the car with ECO start/stop disabled and allow the vehicle to achieve
operating temperature
•
Shut the vehicle down and observe the fuel pressures on the left and right banks at t=0, t=30 minutes, t=60
minutes, and t>120 minutes
•
If at any time the fuel pressure drops below the minimum value and/or a large differential exists between the left and right banks, boroscope the cylinders on the bank with low fuel pressure and determine if one or more of the injectors is leaking.
•
If the fuel pressure remains within acceptable limits proceed to step (4)
•
If one or more of the injectors is leaking, open a PTSS case and upload pictures of the leaking
injector(s) taken with the boroscope as well as the information collected via Xentry thus far.
•
Replace the leaking injector(s)
•
Update the IMA coding for the new injectors in their respective cylinders via Xentry
•
Perform an engine adaptation drive
•
Upload the new injector performance data and quick test to the case
•
Road test the vehicle. If the complaint is no longer present the PTSS case can be closed and
the vehicle released.
4) Open PTSS Case if Above do not Remedy the Complaint:
Include in the case:
1.
All Data from step (3)
2.
MED1775 Control Unit Log
3.
Software update check for ME and Transmission control units
4.
Engine Performance Data
5.
Injector Performance Data
6.
Graphical Readout of Fault Counter from Cold Start
7.
Mechanical Compression Test of ALL Cylinders NOTE: A PICOscope compression test is also acceptable if a
mechnical compression tester is not available
8.
Leakdown Test of ALL cylinders
9.
Boroscope of MISFIRING Cylinder(s)
•
Important: Before performing the boroscope examination, it is imperative that the engine be left to sit until
cold and that the piston is at BDC.

Symptoms
Power generation / Engine management / Engine running / Runs rough/shakes
Power generation / Engine management / Indicator lamp / Engine diagnosis / lit

Control unit/fault code
Control unit

Fault code

Fault text

N3/10 - Motor electronics
P030385
'MED1775' for combustion engine 'M177' (ME),
N3/10 - Motor electronics
'MED1775' for combustion engine 'M178' (ME) (GLC (253)
,G (463),E (213),S (217),S
(222),C (205),AMG GT (190))

Combustion misfiring of cylinder 3 has been detected. There is a
signal above the permissible limit value.

N3/10 - Motor electronics
'MED1775' for combustion engine 'M177' (ME),

Combustion misfiring of cylinder 8 has been detected. There is a
signal above the permissible limit value.

05-11-2018 8:52 PM
© Copyright Daimler AG

P030885

HENRAND

Page 2/4

N3/10 - Motor electronics
'MED1775' for combustion engine 'M178' (ME) (GLC (253)
,G (463),E (213),S (217),S
(222),C (205),AMG GT (190))
N3/10 - Motor electronics
P030285
'MED1775' for combustion engine 'M177' (ME),
N3/10 - Motor electronics
'MED1775' for combustion engine 'M178' (ME) (GLC (253)
,G (463),E (213),S (217),S
(222),C (205),AMG GT (190))

Combustion misfiring of cylinder 2 has been detected. There is a
signal above the permissible limit value.

N3/10 - Motor electronics
P030585
'MED1775' for combustion engine 'M177' (ME),
N3/10 - Motor electronics
'MED1775' for combustion engine 'M178' (ME) (GLC (253)
,G (463),E (213),S (217),S
(222),C (205),AMG GT (190))

Combustion misfiring of cylinder 5 has been detected. There is a
signal above the permissible limit value.

N3/10 - Motor electronics
P030485
'MED1775' for combustion engine 'M177' (ME),
N3/10 - Motor electronics
'MED1775' for combustion engine 'M178' (ME) (GLC (253)
,G (463),E (213),S (217),S
(222),C (205),AMG GT (190))

Combustion misfiring of cylinder 4 has been detected. There is a
signal above the permissible limit value.

N3/10 - Motor electronics
P030185
'MED1775' for combustion engine 'M177' (ME),
N3/10 - Motor electronics
'MED1775' for combustion engine 'M178' (ME) (GLC (253)
,G (463),E (213),S (217),S
(222),C (205),AMG GT (190))

Combustion misfiring of cylinder 1 has been detected. There is a
signal above the permissible limit value.

N3/10 - Motor electronics
P030022
'MED1775' for combustion engine 'M177' (ME),
N3/10 - Motor electronics
'MED1775' for combustion engine 'M178' (ME) (GLC (253)
,G (463),E (213),S (217),S
(222),C (205),AMG GT (190))

Combustion misfiring has been detected. The signal amplitude is
greater than the maximum amplitude.

N3/10 - Motor electronics
P030685
'MED1775' for combustion engine 'M177' (ME),
N3/10 - Motor electronics
'MED1775' for combustion engine 'M178' (ME) (GLC (253)
,G (463),E (213),S (217),S
(222),C (205),AMG GT (190))

Combustion misfiring of cylinder 6 has been detected. There is a
signal above the permissible limit value.

05-11-2018 8:52 PM
© Copyright Daimler AG

HENRAND

Page 3/4

N3/10 - Motor electronics
P030785
'MED1775' for combustion engine 'M177' (ME),
N3/10 - Motor electronics
'MED1775' for combustion engine 'M178' (ME) (GLC (253)
,G (463),E (213),S (217),S
(222),C (205),AMG GT (190))

Combustion misfiring of cylinder 7 has been detected. There is a
signal above the permissible limit value.

Operation numbers/damage codes
Op. no.

Operation text

05-11-2018 8:52 PM
© Copyright Daimler AG

Time

HENRAND

Damage
code

Note

54575 90

Use the appropriate damage code
according to the cause

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