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Home / Codes / P2102
DTC code page

P2102: Throttle Actuator Control Motor Circuit Low

Quick answer: The ECU sees the throttle actuator motor circuit pulled lower than expected, usually because the motor or its wiring cannot carry the control signal correctly.

Drivers also search this fault as throttle actuator motor circuit low, electronic throttle motor low input, P2102 reduced power.

Severity: high Family: powertrain Related paths: 9
Meaning

What P2102 usually means

P2102 sits between a pure open-circuit fault and a full throttle-performance code. The control module still sees the throttle actuator circuit, but the signal or return path is abnormally low, which often means a short to ground, weak power feed, high resistance under load, internal motor trouble, or a connector problem near the throttle body. It is a strong graph choice because drivers usually feel it as reduced power, weak pedal response, or immediate limp behavior, and it connects naturally to the existing P2100, P2101, P2112, and P2135 pages.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Check for companion throttle and pedal codes because P2102 is often only one part of the reduced-power story.
  • Inspect the throttle-body connector closely for heat, oil, or water contamination.
  • Confirm battery and charging voltage are stable before blaming the throttle body alone.
Driving risk

Can you keep driving?

P2102 can leave the vehicle in reduced-power mode with very limited acceleration, so it should be treated as a high-urgency throttle-control fault.

High urgency: If symptoms are active, reduce driving and diagnose quickly before secondary damage builds.
Likely causes

Common causes behind this code

  • Throttle actuator motor circuit is shorted low or partially grounded
  • Power feed to the throttle body drops too far under load
  • Connector terminals are loose, corroded, or heat-damaged
  • Internal throttle actuator motor is drawing the circuit down
  • Harness damage near the throttle body or intake is creating excessive resistance

Cause phrases often tied to this code: short to ground, weak power feed, throttle body connector, actuator motor problem, wiring resistance.

Diagnostic order

Suggested workflow

  1. Scan all modules and capture freeze-frame before clearing anything.
  2. Inspect the throttle-body connector and harness for rubbed insulation, spread terminals, or signs of overheating.
  3. Verify power, ground, and voltage drop at the throttle actuator under load.
  4. Compare commanded throttle movement with actual response and watch for weak or erratic motion.
  5. Replace the throttle body only after the circuit and supply side are proven healthy.
Avoid guesswork

Common mistakes

  • Replacing the throttle body without proving the power and ground path first.
  • Ignoring low-system-voltage clues that can drag throttle circuits down.
  • Treating P2102 as identical to an open-circuit code when the failure mode is different.
Repair path

Practical fix guidance

  • Repair wiring, connector, voltage-drop, or ground faults before installing parts.
  • Replace the throttle body when the actuator itself is proven to be pulling the circuit low or failing under load.
  • After repair, verify normal throttle response and that reduced-power mode stays gone during a road test.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P2102

Useful when the driver knows the wording but not the exact DTC yet.

  • throttle actuator motor circuit low
  • electronic throttle motor low input
  • P2102 reduced power
Related search intent

Queries this page can answer naturally

  • P2102 code meaning
  • what does P2102 mean
  • throttle actuator control motor circuit low
FAQ

Quick questions about P2102

Is P2102 the same as a bad throttle body?

Not automatically. Wiring, connector, voltage-drop, and power-feed problems can all trigger it.

Why does P2102 often cause limp mode?

Because the ECU cannot trust the throttle actuator circuit to deliver normal control authority.

Can low battery voltage contribute to P2102?

Yes. Weak supply can distort electronic throttle operation and make the motor circuit look too low.