P0657 on Toyota Corolla E140: Actuator Supply Voltage A Circuit/Open

Short answer: P0657 means “Actuator Supply Voltage A Circuit/Open”. The car’s computer has found a fault in the ECM system and turns on the Check engine light (MIL). First check: check all battery and ECM power and earth connections first.

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

Code

P0657

System

ECM

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

Likely causes

1. Fault in the part or circuit named in the code

What to check, in order

1. Check all battery and ECM power and earth connections first
2. Read every stored code; an ECM fault is rare, wiring faults are common
3. Have a specialist confirm before replacing the ECM

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

• P0657 · Toyota Passo (1st gen)
• P0657 · Toyota Corolla (11th gen, E170)
• P0657 · Honda City (5th gen, GM2)
• P0657 · Honda Civic (10th gen, FC)
• P0657 · Suzuki Wagon R (Pakistan, K10B)
• P0657 on all cars compared

← P0606 P0685 →

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.