P2127 on Toyota Corolla E170: Throttle/Pedal Position Sensor/Switch E Circuit Low Input

Short answer: P2127 means “Throttle/Pedal Position Sensor/Switch E Circuit Low Input”. The car’s computer has found a fault in the ETCS (throttle) system and turns on the Check engine light (MIL). First check: read the code with an OBD-II scanner.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code

P2127

System

ETCS (throttle)

Dashboard light

Check engine light (MIL)

Applies to

Generic OBD-II meaning. Not every code is used by this car.

Confidence

medium (generic OBD-II definition, not checked against the factory manual for this car)

Source

obd-codes.com

Symptoms and when it is set

1. Check engine light on
2. Rough or low idle
3. Stalling
4. Surging
5. No/little acceleration

Likely causes

1. TPS not mounted securely
2. TPS circuit short to ground or another wire
3. Faulty TPS
4. Damaged computer (PCM)

What to check, in order

1. Read the code with an OBD-II scanner
2. Check the throttle body and pedal sensor connectors
3. Clean a dirty throttle body; do not force the valve by hand
4. Clear the code; some cars need an idle relearn after cleaning

Related on this car

• All fault codes for this car
• Warning lights
• Where the parts are (parts map)
• Common problems

Same code on other cars

• P2127 · Toyota Passo (1st gen)
• P2127 · Toyota Corolla (10th gen, E140)
• P2127 · Honda City (5th gen, GM2)
• P2127 · Honda Civic (10th gen, FC)
• P2127 · Suzuki Wagon R (Pakistan, K10B)
• P2127 on all cars compared

← P2122 P2135 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.