LI09.41-P-072096

Yellow Coolant Temperature Warning in the Instrument Cluster
Topic number
LI09.41-P-072096
Version
1
Function group
09.41 Charge air pipe/charge air cooling
Date
12-04-2020
Validity
Model 167.189/989 with M177LS2
Reason for change
Reason for block
Complaint:
Customer complains of a yellow coolant temperature warning in the instrument cluster
Possible fault codes in PTCU (N127):
U019F87 - Error communicating with coolant pump. The message is missing.
P246B00 - The requirements for regeneration of the diesel or gasoline particulate filter are not met.
Cause:
The electrical connection for the low temperature coolant pump (A000 500 63 00) located on the passenger side of
the transmission is not connected correctly (see picture in attachment).
Attachments
File
Description
picture.jpg
Connector contacts not OK
Remedy:
Check connector for the low temperature pump on the passenger side of the transmission.
Connect the connector contacts correctly
Symptoms
Power generation / Engine cooling system / Indicator lamp / Illuminates yellow
Communication/information / Information display / Indicator lamp / lit
Power generation / Engine cooling system / Display message / Coolant - Serviced Required
Control unit/fault code
Control unit
Fault code
Fault text
N127 - Control unit 'Powertrain' (PTCU) (CPC_NG)
U019F87
Communication with the component 'Coolant pump' has a malfunction. The message is missing.
N127 - Control unit 'Powertrain' (PTCU) (CPC_NG)
P246B00
The preconditions for regeneration of the diesel or gasoline particulate filter are not fulfilled. _
12-04-2020 4:38 AM
© Copyright Mercedes-Benz AG
HENRAND
Page 1/2
Operation numbers/damage codes
Op. no.
Operation text
12-04-2020 4:38 AM
© Copyright Mercedes-Benz AG
Time
HENRAND
Damage
code
Note
50503 73
Please refer to the TIPS document
in the dealer text
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