Conditions Which Generate This Code:
The ECM detects the following conditions:
• The signal voltage from the coolant level sensor is greater than 4.5 VDC for more than ten seconds.
• The “Coolant Level Sensor” parameter is programmed to “2-wire Float Sensor”.
• The ECM has been powered for at least two seconds.
The ECM will default to OK for coolant level. “DIAG” will be displayed next to the status for “Engine
Coolant Level” on the electronic service tool.
Possible Performance Effect:
Perform the following diagnostic procedure:
“Coolant Level Sensor Circuit – Test”
• OK – STOP.