P2103 — Throttle motor circuit voltage too high

The throttle actuator motor is receiving an electrical signal that's too high, causing the engine control module to detect a problem. This usually means there's an issue with the wiring, the throttle body motor itself, or the control module. The car’s throttle may not respond correctly, affecting acceleration and engine performance.

Common causes

The cause is almost always one of a few things. Here they are — P2103 rarely comes from anything outside this list:

• Damaged or shorted wiring in throttle motor circuit
• Faulty throttle actuator motor
• Corroded or loose electrical connectors
• Defective engine control module (rare)
• Blown fuse related to throttle control

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Inspect and repair wiring and connectors first
2. Check and replace blown fuses if needed
3. Test throttle actuator motor operation
4. Clean throttle body and connectors
5. Replace throttle actuator motor if faulty

That is what holds for P2103 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.