One or more of the messages the vehicle controller receives periodically from the Positive Temperature Coefficient (PTC) heater electronic control unit (ECU) is not received, indicating the PTC heater ECU may be unavailable (MIA).
<0.01% (Extremely rare)
None displayed
Thermal management system features depending on PTC heater functionality may be limited or unavailable.
One or more of the messages the vehicle controller receives periodically from the Positive Temperature Coefficient (PTC) heater electronic control unit (ECU) is not received, indicating the PTC heater ECU may be unavailable (MIA).
One or more of the expected messages from the PTC heater ECU is not received.
The vehicle controller starts receiving the expected messages from the PTC heater ECU.
Semitruck
service
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