Solution K51683834
Thursday, July 5, 2018 5:26:29 PM CEST

Volvo Models
Volvo Model

VNX , VNL , VNM , VHD , VAH

Engine family
Engine family

11L Engine , 13L Engine , 16L Engine

Emission Standard
Emission Standard

US15

** SOLUTION **
Title

Volvo Chassis - Diagnostic Trouble Code ( DTC ) P0128, Diagnostic And Repair - US14
+OBD15, Common Model Year 2016

Cause

P0128-00 Coolant Thermostat (Coolant Temp Below Thermostat Regulating
Temperature) may log in US14+OBD15 vehicles. It is possible that the code is generated
due to a software issue, resulting in diagnosis finding no fault.

Solution

Verify the chassis emissions level
• Details can be found in the Product Details box on the Product tab in PTT as seen below:

Review the Detailed Status Information for the relevant code on the DTC Readout.

Software improvements have been released to address this DTC. A Field Service
Bulletin with information and instructions has been published and can be found
under the Service tab in Impact, Function Group 284. The articles can also be
searched for by Title. Refer to the chart below for the correct bulletin information:
Emissions Level

Field Service Bulletin

(Model Year)
US14+OBD15

FSB 284-064 Engine Control Module (ECM) and

(2016)

Aftertreatment Control Module (ACM), Reprogramming

If the Bulletin does not appear when searched with either VIN or Chassis
information entered, search by model:
1. Clear any chassis information from the Search box.
2. Select or enter the applicable model.

3. Make sure Title is selected in the Search By field. Enter the correct Bulletin title in the
text entry field.

4. Press the Search button. The operation will appear in the results window.

5. Select the correct vehicle configuration from the list that appears as shown below:

If software is current according to the bulletin, the code should only be diagnosed if the
Confirmed Status is True, as shown above. If status is False, the code should be cleared and the
vehicle released.

If any other symptoms or related codes are present, they will need to be diagnosed
first. This DTC will not cause any physical symptoms if it is generated by software.
NA_Sister solutions

K45941512

Campaign code

FSB284-064

Solution visibility

Dealer distribution

Function(s)/component(s) affected
Function affected

FSB

, cooling , 1 1 0 EMS , Diagnostic tool

Function Group
Function Group

26 cooling system , 284 control system, fuel supply

Customer effect
Main customer effect

calibration/programming/pairing/missing operation , diagnostics/methodology , fault
code/display

Fluid implicated

coolant

Fault code(s)
OBD 2013 Diagnostic
Trouble Codes

P0128

Conditions
Vehicle operating mode
Frequency of occurrence of
problem

when driving , when stationary
random

Administration
Author

a175606

Last modified by

RU4469V

Creation date

06-04-2016 16:04

Date of last update

20-06-2018 16:06

Status

Published