The ambient air temperature signal is sent to the instrument cluster module. The instrument cluster module then transmits the ambient air temperature data to the Engine Control Module (ECM) via the J1939 data lines.
Probable cause
1) Ambient temperature below -30??C (-22??F)
2) Wiring harness
3) Faulty sensor
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2021 VOLVO PREMIUM TECH TOOL PTT V2.8.21 VCADS+DEVELOPER TOOL+APCI 2021/09 ( 1 PC )
Trucks software $85.00
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