Throttle Actuator Control System - Forced Limited RPM

What it means

The engine computer has detected a fault in the electronic throttle system or its sensors, so it limited the maximum engine speed to protect the engine and the driver. This code is the result of another fault and usually appears with a throttle sensor, pedal sensor or throttle motor code.

Related codes: P2104P2106P2135P2138P2101

Symptoms4

• The engine will not rev past a certain speed however far the pedal is pressed.
• Weak acceleration and reduced top speed.
• Check engine light on, sometimes with the electronic throttle warning light.
• Other throttle or pedal sensor codes are stored.

Possible causes5

• The two throttle position or pedal position signals do not agree.
• Dirty throttle body or weak throttle motor.
• Corroded connectors, wiring faults or a sensor reference voltage problem.
• Low battery voltage.
• Engine computer (ECU) fault, which is rare.

How to diagnose5

1. Read all stored codes and fix the accompanying codes first.
2. Watch both throttle sensor and both pedal sensor readings on a scan tool and confirm they agree.
3. Check battery voltage and the sensor reference voltage.
4. Inspect the throttle body for carbon or binding.
5. Inspect connectors and wiring for corrosion or looseness.

How to fix5

1. Clean the throttle body and perform the relearn procedure.
2. Repair faulty connectors or wiring.
3. Fix a weak battery if found.
4. Replace the sensor or throttle body based on the accompanying code and test results.
5. Clear the codes and confirm the engine revs normally and the code does not return.

The cost is low for a throttle cleaning or connector repair, and rises when a new pedal sensor or throttle body is needed.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions