C15 – 0171-03 Ambient Air Temperature voltage high

Conditions Which Generate This Code:

The ECM detects the following conditions:
• The signal voltage from the ambient air temperature sensor is greater than 4.92 VDC for
more than eight seconds.
• The “Allow Idle Shutdown Override” parameter is programmed to “Outside Temperature Based” or
“J1587 Outside Temperature Based”.
• The ECM has been powered for at least two seconds.

System Response:
The ECM will default to 65 C (149 F) for outside air temperature. “DIAG” will be displayed next to
the status for “Outside Temperature Sensor” on the electronic service tool.

Possible Performance Effect:
“Allow Idle Shutdown Override” is disabled while this code is Active.

Perform the following diagnostic procedure: “Engine Temperature Sensor Open or Short Circuit – Test”

• OK – STOP.

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