Ricky Beals Posted August 17, 2023 Share Posted August 17, 2023 On my 2000 mack RD im gettng a 2-1 code. This is showing up as engine coolant temp. How should I go about fixing this? Thanks Ricky Quote Link to comment https://www.bigmacktrucks.com/topic/73186-2-1-flash-code/ Share on other sites More sharing options...
Joey Mack Posted August 18, 2023 Share Posted August 18, 2023 There is 1 or 2 sensors in the rear of the rear water manifold. Quote Link to comment https://www.bigmacktrucks.com/topic/73186-2-1-flash-code/#findComment-537228 Share on other sites More sharing options...
Ricky Beals Posted August 18, 2023 Author Share Posted August 18, 2023 (edited) I see one. What should i do to check it? Edited August 18, 2023 by Ricky Beals Quote Link to comment https://www.bigmacktrucks.com/topic/73186-2-1-flash-code/#findComment-537242 Share on other sites More sharing options...
Joey Mack Posted August 18, 2023 Share Posted August 18, 2023 Check the wires and the pins in the plugs. Quote Link to comment https://www.bigmacktrucks.com/topic/73186-2-1-flash-code/#findComment-537244 Share on other sites More sharing options...
Ricky Beals Posted August 20, 2023 Author Share Posted August 20, 2023 Ok JoJo the wires and connector looks good. Pins are find. You think i should replace it? Quote Link to comment https://www.bigmacktrucks.com/topic/73186-2-1-flash-code/#findComment-537389 Share on other sites More sharing options...
Joey Mack Posted August 20, 2023 Share Posted August 20, 2023 Buddy, there is 9 pages of diag. for this code. Yes you change it, but if its not a bad sensor, you will have to trouble shoot it.. Here is a small sample of tests. You will need a DVOM. Harbor frieght has one for about $30.00 if you dont have one. Quote Link to comment https://www.bigmacktrucks.com/topic/73186-2-1-flash-code/#findComment-537390 Share on other sites More sharing options...
Joey Mack Posted August 21, 2023 Share Posted August 21, 2023 Ricky, I found this on E-Bay.. $55.55. This is the book that I have. It is all you will need to trouble shoot future fault codes.. Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/73186-2-1-flash-code/#findComment-537479 Share on other sites More sharing options...
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