P213 is a diagnostic trouble code (DTC) that indicates a problem with the throttle position sensor (TPS) in a vehicle. This sensor monitors the position of the throttle plate and sends this information to the engine control unit (ECU). If the ECU detects an inconsistency or malfunction in the TPS signal, it triggers the P213 code. When the P213 code is present, it can lead to issues such as reduced engine performance, poor fuel economy, or even stalling. To resolve this issue, a mechanic typically inspects the TPS and its wiring, and may need to replace the sensor or repair any electrical faults.