P2103: Throttle Actuator A Control Motor Circuit High

What does P2103 mean?

P2103 is the high-side fault of the throttle A drive: the output stage sees a voltage that suggests a short to battery, or on some layouts the supply relay of the throttle motor stays energized when it should be off. GM groups P2100-P2103 as power-limiting faults (18OBDG03A), and its Bosch-based 2012 ECM ties a power-stage short circuit to this range with about 0.1 s detection. Mitsubishi's 2022 Outlander list files P2100 and P2103 under the short name ETC MOT PWR, i.e. the supply of the throttle control motor, stored after one trip. The throttle is de-energized and power limited. Low-side faults are P2102, open circuit P2100.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Limp mode with very limited power
• Engine warning lamp on
• Engine may not start or stalls

Common causes

• High Motor wire shorted to a battery-voltage feed
• Medium Throttle motor relay sticking on (where fitted)
• Medium Damaged or wet throttle connector
• Low Internal fault in the ECU throttle driver

Likelihood is a general estimate across vehicles; your make and model may differ.