One or more of the messages the vehicle controller receives periodically from the heat pump system compressor (CMPD) electronic control unit (ECU) is not received, indicating the CMPD ECU may be unavailable (MIA).
<0.01% (Extremely rare)
None displayed
The HVAC system may be unavailable or may not function as expected.
One or more of the messages the vehicle controller receives periodically from the heat pump system compressor (CMPD) electronic control unit (ECU) is not received, indicating the CMPD ECU may be unavailable (MIA).
One or more of the expected messages from the CMPD ECU is not received.
The vehicle controller starts receiving the expected messages from the CMPD ECU.
Semitruck
service-fix
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