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Preview Solution CBR-2465-3
Proactive Engine Restart ( Remote
Engine Start System) - VN (4) - PR (4)
Published 4 September 2025

Valid For
Volvo Chassis- VN (4)
Mack Chassis - PR (4)

1. OVERVIEW
1. This CBR pertains to two issues that may arise with the Proactive
Engine Restart (Remote Engine Start System)
1. Key Fob Activation Issue:
NOTE: ONLY APPLICABLE TO SALES PACKAGE
H9AC1X
Remotely starting the engine via the AUX switch on the key
fob DOES NOT work
Lock, unlock, and turning on parking heater via key fob
Does work

1. Flexible Switch Activation Issue:
The Auto Start/Stop flexible switch (pictured below) does not activate the
system – no alert is displayed that the system has been activated.

; Live UI
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1. PROCESS
To troubleshoot these issues, verify that the ‘closed hood’ pre-condition
for Proactive Engine Restart is met.
1. To verify correct hood sensor function, use Sensor and
Parameter Values, Monitoring test in Premium Tech Tool
(PTT).
2. Connect the truck to PTT and navigate to the Test tab.
3. Select operation 1700-08-03-06 Sensor and Parameter
Values, Monitoring.

4. Once operation has loaded, enter P1EQZ in the search bar.
Once located, select the parameter and press continue. Note:
Tech Tool needs to be up to date with the latest software.

; Live UI

5. You will need to verify 3 voltages to ensure the hood status is
being reported properly.
Hood fully closed/shut

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One latch open/released
Both latches open/released
You can pull the hood release lever very slowly to unlock the
latches one-by-one for this test.
Observe the voltage with the hood completely shut, with one
latch open, and with both latches open. There should be a
significant voltage drop between each of the three hood states
above.
Note: The voltages depend heavily on the battery status and state
of charge, so voltages may vary significantly from one truck to
another.
Example voltages (Real voltages may vary):
Hood fully closed: 17.4V
One latch open: 13.6V
Both latches open: 5.6V
Latches fully close and opening only 1 latch from example above.
Note the voltage drop:

Upon opening the 2nd latch (note the further voltage drop):

; Live UI

These voltage drops as the hood is unlatched indicate the latches
are reporting their states to the truck and Tech Tool properly and

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the hood sensors are functional.

1. TESTING
1. Once the adjustment is complete, verify that the Proactive Engine
Restart is working correctly – ensure that the following preconditions are
met:
1. Test Proactive Engine Restart With Key Fob
Driver and Passenger doors must be closed
Hood must be closed
Fuel level must be above 12.5%
Park brake must be applied
Gear lever must be in Neutral position
Vehicle mode must be in Living or Parked
Auto Start/Stop flexible switch is NOT ACTIVATED (flexible
switch on the left side of the dash is not lit up)
Once ALL of the above preconditions are met, press and
hold AUX button on the key fob for 3 seconds to start the
engine.
2. Test Proactive Engine Restart with Flexible Switch
For vehicles with key and cylinder: insert the key, ensuring
that it is in the OFF or Accessory Position
For vehicles with a key fob and push start: the key fob
must be located inside the cab and truck is off.
Driver and passenger doors must be closed.
Hood must be closed.
Fuel level must be above 12.5%
Park brake must be applied
Gear Lever must be in Neutral position
Accelerator pedal must be released

;

Live UI

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Once ALL of the above preconditions are met, press the
Proactive Engine Start flexible switch to enable the
function. A message on the instrument cluster display
(picture right) will verify successful activation.

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; Live UI
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