Discussion in 'Peterbilt Forum' started by rocknroll13, Dec 13, 2011.
2005 peterbilt c-15 cat...getting a fault code 12....wat is a fault code 12?
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I think it is a fault with the coolant level sensor.
coolant level fault
That is common with Pete's, usually from moisture. You can get the coolant level set at default in the ECM, but unhook the sensor and just monitor the level yourself.