P1125 Code: Throttle Control Motor Circuit (Toyota)

What the P1125 code means

P1125 is a manufacturer-specific code: the 1 in the second position means each automaker defines what it stands for, not the generic standard. The most widespread definition is the one used by Toyota and Lexus. If your vehicle is another brand, confirm the code text with a scan tool that supports that manufacturer.

Toyotas with an electronic throttle (ETCS-i) move the throttle plate with an electric motor controlled by the computer, which reads the pedal with two sensors. When it detects a fault, it goes into limp mode: a spring holds the throttle plate almost closed and the engine barely accelerates.

The computer sets the P1125 code when it detects an electrical fault in the motor that moves the throttle plate.

Before you repair anything, confirm the make, model, year and engine. With manufacturer codes, the same number can change even between engines from the same brand.

P1125 code symptoms

• Check engine light on.
• Limp mode: the engine barely accelerates.
• High or unstable idle.
• The engine may stall.

Likely causes of the P1125 code

1. Failed throttle motor. Confirm it with the tests in the diagnosis section.
2. Connector or wiring. Check the locking tab and the pins, and look for moisture or corrosion.
3. Blown ETCS fuse.
4. Dirty throttle body that drags on the motor.

How to diagnose the P1125 code step by step

1. Read all stored codes and the live data for the pedal and the throttle plate.
2. Clean the throttle body with the ignition off.
3. Check the connectors at the throttle body and at the pedal.
4. Check the battery and the grounds.
5. Perform the idle relearn if the manufacturer calls for it.

How to fix the P1125 code

• Clean or replace the throttle body.
• Replace the pedal if its sensors fail.
• Repair the connectors or the wiring.
• Clear the codes, confirm that the P1125 code does not come back, and verify the repair on a test drive.

Technical reference data

• Throttle motor: approximate resistance of 0.3 to 100 ohms depending on the model; check the service manual.
• Pedal: two signals, VPA and VPA2, that must move in parallel.
• P1xxx codes are manufacturer-specific: confirm the definition with a scan tool that supports your brand.
• Values are approximate: check the manufacturer data for your vehicle.

Brand-specific notes

Common on Corolla, Camry, RAV4 and Tacoma models from the 2000s.

If your vehicle is another brand, check the table above for the meaning its manufacturer gives the code, and confirm it with a scan tool that supports that brand.

Frequently asked questions about P1125