COMAND(R) - 'Drive Unavailable, Temp. Too High' Message

COMAND(R) - 'Drive Unavailable, Temp. Too High' Message

The "Drive Unavailable, Temp. Too High" message on your COMAND system indicates that your vehicle's transmission temperature is too high and needs to cool down before it can be used again. This can be caused by a number of factors, including towing a heavy load, driving in high temperatures or stop-and-go traffic, or a malfunctioning cooling system.

Here are some steps you can take to address this issue:

1. Pull over and turn off the engine: If you receive this message while driving, pull over to a safe location and turn off the engine. Allow the vehicle to cool down for at least 30 minutes before attempting to drive it again.

2. Check the coolant level: If your vehicle's coolant level is low, it can cause the engine to overheat and trigger the "Drive Unavailable, Temp. Too High" message. Check the coolant level and add more if necessary.

3. Inspect the cooling system: The cooling system consists of several components, including the radiator, thermostat, water pump, and hoses. If any of these components are malfunctioning or damaged, they can cause the engine to overheat. Have a certified mechanic or dealership inspect the cooling system to identify and fix any issues.

4. Avoid towing heavy loads: Towing a heavy load can put additional strain on the engine and cause it to overheat. If you need to tow a load, make sure it is within the vehicle's towing capacity and avoid driving in hot or hilly conditions.

5. Service the transmission: Regular transmission service, such as fluid changes, can help ensure that the transmission is functioning properly and prevent overheating.

It is important to address this issue promptly to prevent damage to the transmission and ensure the safe operation of your vehicle. If the issue persists, take your vehicle to a certified mechanic or dealership for further diagnosis and repair.

The "Drive Unavailable, Temp. Too High" message on your COMAND system can be caused by a number of issues related to the vehicle's transmission or cooling system. Here are some steps you can take to help address the issue:

1. Stop the vehicle: If the "Drive Unavailable, Temp. Too High" message appears while driving, safely stop the vehicle as soon as possible to prevent damage to the transmission.

2. Allow the vehicle to cool down: Turn off the engine and allow the vehicle to cool down for at least 30 minutes. This will help lower the temperature of the transmission and cooling system.

3. Check the coolant level: The vehicle's cooling system should be inspected to ensure the coolant level is at the recommended level. If it is low, refill it with the proper coolant.

4. Check for leaks: The cooling system should also be checked for any leaks that could be causing a loss of coolant. If any leaks are found, they should be repaired.

5. Check the transmission fluid level: The transmission fluid level should also be checked to ensure it is at the correct level. Low transmission fluid levels can cause the transmission to overheat.

6. Inspect the transmission cooler: The transmission cooler is responsible for cooling the transmission fluid. It should be inspected to ensure it is not blocked or damaged, preventing the transmission from cooling properly.

7. Inspect the radiator: The radiator is responsible for cooling the engine coolant. It should be inspected to ensure it is not blocked or damaged, preventing the engine from cooling properly.

8. Inspect the transmission: If the above steps do not resolve the issue, there may be an internal issue with the transmission that is causing it to overheat. A certified mechanic or dealership should inspect the transmission for any issues and perform any necessary repairs.

It is important to address the "Drive Unavailable, Temp. Too High" message promptly to prevent damage to the transmission and ensure safe operation of the vehicle. If the issue persists, it is recommended to take your vehicle to a certified mechanic or dealership for further diagnosis and repair.

2020 Mercedes Benz Truck ML 350 Technical Service Bulletin # LI82-85_P-048914 Date: 100218

2020 Mercedes Benz Truck ML 350 Technical Service Bulletin # LI82-85_P-048914 Date: 100218

COMAND(R) - 'Drive Unavailable, Temp. Too High' Message

COMAND APS: Fault message "Drive unavailable, temperature too low or too high"

Topic number LI82.85-P-048914

Version 1

Design group 82.85 Navigation and communication systems (CNS, ICS, COMAND, FleetBoard)

Date 02-18-2010

Validity Model 171, 230, 164, 251, 169, 245, 211, 219, 203.7 with COMAND (code 512 or 527) and code 809 or 800 (NTG2.5)

Model 463 with SA code EU1

Reason for change

Reason for block

Complaint:

Complaint 1:

At high altitudes (over approx. 3000 meters above sea-level) the navigation main menu sporadically displays the fault message "Drive unavailable,

temperature too high".

2020 Mercedes Benz Truck ML 350 4MATIC (164.186) V6-3.5L (272.967) Page 286

The following functions are restricted due to the shutdown of the hard drive.

- Navigation

- Voice control

- Address book

- Music register (downloaded music onto the head unit hard-drive)

- Gracenote database for identifying album, track and performer information on an audio CD

Complaint 2:

The navigation main menu permanently displays the fault message "Drive unavailable, temperature too low or too

high"

Cause:

Re 1.)

The hard drive shuts down at high altitudes (over approx. 3000 m) and when the temperature of the hard drive is high.

a) At low altitudes the message disappears and the COMAND unit (A40/3) operates without problems. This is due to a safety feature created to

protect the hard-drive from permanent damage.

b) High hard drive temperatures are increased by high volume settings especially in vehicles without sound system (SA code 810), high outside

and engine temperatures and unfavorable settings on the heating/air conditioning. With the altitude increase and decreasing of air around

hard-drive assembly, the HDD starts the shut down process as the surrounding head unit temperature also reaches around 55 degrees Celsius.

The head unit is working as specified in this use case.

Re. 2.)

There is a hardware fault in the COMAND unit (A40/3).

Remedy:

Remedy 1.)

To prevent damage to the hard drive, it is shut down at high altitudes and high temperatures. This is due to a safety feature (series production

configuration). => Do not replace any equipment!

Remedy 2.)

If the fault occurs constantly, replace the COMAND APS (A40/3). Refer to EPC.

Note:

If the vehicle is fitted with a COMAND APS (A40/3) with PIN theft protection, the PIN code must be recorded in the VeDoc system. Pay attention

to the relevant information during initial startup with DAS / Xentry Diagnostics.

Symptoms

2020 Mercedes Benz Truck ML 350 4MATIC (164.186) V6-3.5L (272.967) Page 287

Mercedes Benz Truck ML 350 (164.156) Technical # LI82-85_P-048914 Date: 100218 COMAND(R) - 'Drive Unavailable, Temp. Too High' Message

Mercedes Benz Truck ML 350 (164.156) Technical  # LI82-85_P-048914 Date: 100218
COMAND(R) - 'Drive Unavailable, Temp. Too High' Message
COMAND APS: Fault message "Drive unavailable, temperature too low or too high"
Topic number LI82.85-P-048914
Version 1
Design group 82.85 Navigation and communication systems (CNS, ICS, COMAND, FleetBoard)
Date 02-18-2010
Validity Model 171, 230, 164, 251, 169, 245, 211, 219, 203.7 with COMAND (code 512 or 527) and code 809 or 800 (NTG2.5)
Model 463 with SA code EU1
Reason for change
Reason for block
Complaint:
Complaint 1:
At high altitudes (over approx. 3000 meters above sea-level) the navigation main menu sporadically displays the fault message "Drive unavailable,
temperature too high".
  Page 254
The following functions are restricted due to the shutdown of the hard drive.
- Navigation
- Voice control
- Address book
- Music register (downloaded music onto the head unit hard-drive)
- Gracenote database for identifying album, track and performer information on an audio CD
Complaint 2:
The navigation main menu permanently displays the fault message "Drive unavailable, temperature too low or too
high"
Cause:
Re 1.)
The hard drive shuts down at high altitudes (over approx. 3000 m) and when the temperature of the hard drive is high.
a) At low altitudes the message disappears and the COMAND unit (A40/3) operates without problems. This is due to a safety feature created to
protect the hard-drive from permanent damage.
b) High hard drive temperatures are increased by high volume settings especially in vehicles without sound system (SA code 810), high outside
and engine temperatures and unfavorable settings on the heating/air conditioning. With the altitude increase and decreasing of air around
hard-drive assembly, the HDD starts the shut down process as the surrounding head unit temperature also reaches around 55 degrees Celsius.
The head unit is working as specified in this use case.
Re. 2.)
There is a hardware fault in the COMAND unit (A40/3).
Remedy:
Remedy 1.)
To prevent damage to the hard drive, it is shut down at high altitudes and high temperatures. This is due to a safety feature (series production
configuration). => Do not replace any equipment!
Remedy 2.)
If the fault occurs constantly, replace the COMAND APS (A40/3). Refer to EPC.
Note:
If the vehicle is fitted with a COMAND APS (A40/3) with PIN theft protection, the PIN code must be recorded in the VeDoc system. Pay attention
to the relevant information during initial startup with DAS / Xentry Diagnostics.
Symptoms
  Page 255
Work units
Validity

Mercedes Benz Truck R 320 BLUETEC Technical LI82-85_P-048914 Date: 100218 COMAND(R) - 'Drive Unavailable, Temp. Too High' Message

Mercedes Benz Truck R 320 BLUETEC Technical LI82-85_P-048914 Date: 100218
COMAND(R) - 'Drive Unavailable, Temp. Too High' Message
COMAND APS: Fault message "Drive unavailable, temperature too low or too high"
Topic number LI82.85-P-048914
Version 1
Design group 82.85 Navigation and communication systems (CNS, ICS, COMAND, FleetBoard)
Date 02-18-2010
Validity Model 171, 230, 164, 251, 169, 245, 211, 219, 203.7 with COMAND (code 512 or 527) and code 809 or 800 (NTG2.5)
Model 463 with SA code EU1
Reason for change
Reason for block
Complaint:
Complaint 1:
At high altitudes (over approx. 3000 meters above sea-level) the navigation main menu sporadically displays the fault message "Drive unavailable,
temperature too high".
The following functions are restricted due to the shutdown of the hard drive.
- Navigation
- Voice control
- Address book
- Music register (downloaded music onto the head unit hard-drive)
- Gracenote database for identifying album, track and performer information on an audio CD
Complaint 2:
The navigation main menu permanently displays the fault message "Drive unavailable, temperature too low or too
high"
Cause:
Re 1.)
Mercedes Benz Truck R 320 BLUETEC
Page 439
The hard drive shuts down at high altitudes (over approx. 3000 m) and when the temperature of the hard drive is high.
a) At low altitudes the message disappears and the COMAND unit (A40/3) operates without problems. This is due to a safety feature created to
protect the hard-drive from permanent damage.
b) High hard drive temperatures are increased by high volume settings especially in vehicles without sound system (SA code 810), high outside
and engine temperatures and unfavorable settings on the heating/air conditioning. With the altitude increase and decreasing of air around
hard-drive assembly, the HDD starts the shut down process as the surrounding head unit temperature also reaches around 55 degrees Celsius.
The head unit is working as specified in this use case.
Re. 2.)
There is a hardware fault in the COMAND unit (A40/3).
Remedy:
Remedy 1.)
To prevent damage to the hard drive, it is shut down at high altitudes and high temperatures. This is due to a safety feature (series production
configuration). => Do not replace any equipment!
Remedy 2.)
If the fault occurs constantly, replace the COMAND APS (A40/3). Refer to EPC.
Note:
If the vehicle is fitted with a COMAND APS (A40/3) with PIN theft protection, the PIN code must be recorded in the VeDoc system. Pay attention
to the relevant information during initial startup with DAS / Xentry Diagnostics.
Symptoms
Work units
Mercedes Benz Truck R 320 BLUETEC
Page 440
Validity

COMAND(R) - 'Drive Unavailable, Temp. Too High' Message

2010 Mercedes Benz Truck GL 350 BLUETEC (164.825) V6-3.0L DSL Turbo (642.820)
Vehicle: All Technical Service Bulletins
COMAND(R) - 'Drive Unavailable, Temp. Too High' Message
COMAND APS: Fault message "Drive unavailable, temperature too low or too high"
Topic number LI82.85-P-048914
Version 1
Design group 82.85 Navigation and communication systems (CNS, ICS, COMAND, FleetBoard)
Date 02-18-2010
Validity Model 171, 230, 164, 251, 169, 245, 211, 219, 203.7 with COMAND (code 512 or 527) and code 809 or 800 (NTG2.5)
Model 463 with SA code EU1
Reason for change
Reason for block
Complaint:
Complaint 1:
At high altitudes (over approx. 3000 meters above sea-level) the navigation main menu sporadically displays the fault message "Drive unavailable,
temperature too high".
The following functions are restricted due to the shutdown of the hard drive.
- Navigation
- Voice control
- Address book
- Music register (downloaded music onto the head unit hard-drive)
- Gracenote database for identifying album, track and performer information on an audio CD
Complaint 2:
The navigation main menu permanently displays the fault message "Drive unavailable, temperature too low or too
high"
Cause:
Re 1.)
The hard drive shuts down at high altitudes (over approx. 3000 m) and when the temperature of the hard drive is high.
a) At low altitudes the message disappears and the COMAND unit (A40/3) operates without problems. This is due to a safety feature created to
protect the hard-drive from permanent damage.
b) High hard drive temperatures are increased by high volume settings especially in vehicles without sound system (SA code 810), high outside
and engine temperatures and unfavorable settings on the heating/air conditioning. With the altitude increase and decreasing of air around
hard-drive assembly, the HDD starts the shut down process as the surrounding head unit temperature also reaches around 55 degrees Celsius.
The head unit is working as specified in this use case.
Re. 2.)
There is a hardware fault in the COMAND unit (A40/3).
Remedy:
Remedy 1.)
To prevent damage to the hard drive, it is shut down at high altitudes and high temperatures. This is due to a safety feature (series production
configuration). => Do not replace any equipment!
2010 Mercedes Benz Truck GL 350 BLUETEC (164.825) V6-3.0L DSL Turbo (642.820)
Remedy 2.)
If the fault occurs constantly, replace the COMAND APS (A40/3). Refer to EPC.
Note:
If the vehicle is fitted with a COMAND APS (A40/3) with PIN theft protection, the PIN code must be recorded in the VeDoc system. Pay attention
to the relevant information during initial startup with DAS / Xentry Diagnostics.
Symptoms
Work units
Validity