Thermo King SB3 + Started throwing A Code 20 and will not start in auto start. I replaced the fuel Filter but it did not fix the problem, After I clear the Code I can start it in Manuel Mode. Any help?
Several things can cause that code. When it starts does it sputter? What is the battery voltage?
On the one I have it was a bad ground. You’ll have a main ground for the battery, then another with 3-4 wires. My problem was with the 3-4 wire ground.