I have a 2001 331D s/n 232511169 with a general warning light that stays on and the temp gauge is pegged to the right. I installed a new controller had it programed by bobcat. Code 08-21 is the only code that popped up. I have checked the coolant system. All good. Checked the wiring, also good. The machine has not gotten hot. 150°F at temp sensor. How do I fix this problem? Help