Dashboard wire harness

Before you get all wrapped around the axle, the normal thing to do would be to check if that bulb is burned out. Even if it is, diagnostic fault codes can still be read with a code reader or scanner.

If the bulb is good, the circuit in the Engine Computer that drives it could have a problem, and that could potentially be related to the computer not communicating with a scanner. That would require a different Engine Computer, not an instrument cluster.