P1120Manufacturer-specific code

P1120 Code: Accelerator Pedal Position Sensor Circuit (Toyota)

On Toyota and Lexus, the P1120 code points to the accelerator pedal position sensor circuit. The engine goes into limp mode with very little power. On other brands the number can mean something else.

Severity
High
Can I keep driving?
Yes, but with caution
Estimated cost
$0 to $600
Difficulty
Medium
System
Idle and Speed Control
Applies to
Depends on the manufacturer

Common in: Toyota

Updated Reviewed by Renzo Chacca

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What the P1120 code means

P1120 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.

ManufacturerMeaning of P1120
Toyota and LexusAccelerator pedal position sensor circuit

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 P1120 code when the pedal sensor signal is out of range or does not agree with the second signal.

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.

P1120 code symptoms

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

Likely causes of the P1120 code

  1. Worn pedal sensor. The most frequent cause.
  2. Pedal connector with corrosion. Check the locking tab and the pins, and look for moisture or corrosion.
  3. Damaged wiring. Look for rubbing against the engine, the chassis or the exhaust.
  4. Computer. Uncommon.

How to diagnose the P1120 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 P1120 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 P1120 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 P1120

What does the P1120 code mean on a Toyota?
It points to the accelerator pedal position sensor circuit. The engine goes into limp mode with very little power.
Does P1120 mean the same thing on every brand?
No. It is a manufacturer code, and on other brands it may not exist or it may mean something else.
Can I drive with a P1120 code?
Only with great caution. Power is minimal, and that can be dangerous on fast roads or when merging. Drive straight to a shop at low speed if you must move the vehicle.
How much does it cost to fix P1120?
On a Toyota the cost runs from about $0 to $600. A loose or corroded connector costs little, while a new pedal assembly or throttle body costs more.
Will a P1120 code clear itself?
If the fault was momentary, limp mode may end after a restart and the light may eventually go out. A worn pedal sensor will bring the code back, so do not count on it going away.
What is the most common cause of P1120?
A worn accelerator pedal sensor. Corroded connectors and damaged wiring at the pedal come next.

Related codes

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