This error code is a generic trouble code meaning it applies to all vehicles equipped with obd ii system especially those made since 1996 up to present.
P2118 throttle actuator control motor current range performance.
When the voltage becomes unstable the etcs itself becomes unstable.
There are six codes that are associated with throttle actuator control system malfunctions and they are p2107 p2108 p2111 p2112 p2118 and p2119.
Error code p2118 is defined as throttle actuator control motor current range performance which usually happens due to wiring or throttle motor issue.
Obd ii fault code p2118 is a generic code that is defined as throttle actuator control tac throttle motor current range performance problem and is set when the pcm powertrain control module detects that the input voltage in the throttle control motor s control circuit falls outside of the expected desired range or that the throttle control motor does not perform as expected.
This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.
The voltage bm is monitored and when the voltage is low less than 4 v the engine control module concludes that the etcs has a fault and current to the throttle actuator is cut.
P2118 toyota description the electronic throttle control system etcs has a dedicated power supply circuit.