My throttle body light (the red lightning Bolt) turns on?

My throttle body light (the red lightning bolt) came up on my dashboard. But if I turn the car off and back on it goes away. When this happens the check gauges come on and the temperature gauge stays on C. Is there something wrong with the throttle body or is it not a concern? Note: I just got the radiator and thermostat changed. So, the temperature gauge is in working condition. Note: then sometimes I turn the car on a boom nothing on the dash car is working fine.