P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High

diagnostic check engine light

P2103 code definition

The P2103 code is a generic powertrain code related to the fuel or air metering system, including the mass air flow sensor. In this case, the engine control module (ECM) has detected a fault with the throttle actuator control motor circuit. Other control modules, including the transmission control module and body control module, may also store this code.

Codes related to the P2103 include:

What the P2103 code means

A sensor on the accelerator pedal arm sends a voltage signal to the ECM (or related control module), which then commands the throttle body to open or close. Voltage signals sent from the ECM will activate the throttle actuator motor in the direction required by changing voltage levels and polarity. Then, as the throttle actuator motor turns, a gear in the throttle body turns and is meshed with a larger gear. The change in ratio allows the throttle plate to open quickly or slowly as needed.

A code P2103 will be stored when the ECM or other control module detects an error or fault with the throttle actuator control motor circuit. Some vehicle makes and models may require multiple drive cycles with a failure detected before the service engine light is illuminated.

Note, a P2103 code only applies to vehicles with an electronically controlled throttle body, also referred to as drive-by-wire throttle bodies.

What causes the P2103 code?

Several problems may cause a P2103 code including:

  • Damaged or defective throttle actuator control motor
  • Damaged or defective throttle position actuator
  • Damaged or defective throttle position sensor
  • Damaged or defective pedal position sensor
  • Damaged, corroded, open, or shorted wiring and related connectors in throttle actuator motor or CAN bus harness
  • Loose control module ground strap
  • Broken ground wire

What are the symptoms of the P2103 code?

Symptoms of a P2103 code may include:

How does a mechanic diagnose the P2103 code?

A mechanic may use several methods to diagnose a P2103 trouble code, including: * Utilize an OBD-II scanner to check for a stored P2103 trouble code * Visually inspect wiring and related electrical components for signs of damage or corrosion * Test throttle actuator control module connector voltage and ground signals while the motor is activated * Test each individual circuit if no voltage and ground signals are present to pinpoint the location of the fault * Check CAN bus for loose, damaged or corroded electrical connections

Common mistakes when diagnosing the P2103 code

It is recommended to always diagnose and troubleshoot diagnostic trouble codes in the order in which they appear, as codes further down the list may simply be a symptom of a code higher up.

How serious is the P2103 code?

Because a vehicle’s safe driving operation most likely will be impacted due to faults that store a P2103 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.

What repairs can fix the P2103 code?

Several repairs can fix a P2103 trouble code and include:

  • Replace or repair damaged or defective wiring and related electrical components
  • Replace damaged or defective throttle position sensor
  • Replace damaged or defective throttle body
  • Replace damaged or defective pedal sensor
  • Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

Additional information related to a P2103 code

Due to the number of possible places a fault can occur, it is recommended to have the testing of the electrical system and any repairs related to the CAN bus handled by a professional to avoid causing additional damage.

Need help with a P2103 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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