What is Fault Code 12? Peterbilt c-15 CAT
Discussion in 'Peterbilt Forum' started by rocknroll13, Dec 13, 2011.
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I think it is a fault with the coolant level sensor.
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coolant level fault
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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.
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