P0657

Actuator Supply Voltage A Circuit/Open

Actuator supply voltage Generic OBD-II High

What it means

P0657 means the actuator supply voltage 'A' circuit — the feed the ECM/PCM uses to power actuators like injectors and solenoids — is open or has lost voltage. Because those actuators depend on it, the engine can run poorly, stall, or fail to start. It's usually a wiring or connection fault or an internal module problem.

High

Can I keep driving? Often limited — this circuit powers engine actuators, so the engine can run poorly, stall, or fail to start until the open is repaired.

Real-world scan data

Seen in

5,168

scans in the past year

Found in

0.8%

of scans

1.5%

of scans that found faults

Appears alongside · share of P0657 scans

P0480in 38.4% of scans

P0645in 35.9% of scans

P0226in 28.8% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Engine stalls or fails to start
Reduced engine power or acceleration
Rough or erratic engine performance

Common causes

Most likely first

Open or damaged wiring in the actuator supply voltage circuitLikely
Loose or corroded connector at the ECM/PCM or actuatorsCommon
Faulty actuator loading down or opening the supplyCommon
Internal fault in the ECM/PCM supply driverLess often

How to diagnose & fix

Work through it in order

Check the ECM/PCM power and ground feeds and the actuator supply circuit for an open or high resistance.
Inspect connectors along the supply circuit for corrosion, backed-out pins, or damage.
Test the actuators fed by this circuit to rule out one shorting or opening the supply.
If wiring and actuators are good, the ECM/PCM supply driver may be at fault — reprogram or replace. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0657?+

Risky — because this circuit powers engine actuators, the car may stall or not restart. Drive as little as possible and get it diagnosed.

Can I just clear P0657?+

An open supply circuit will set the code again immediately. It needs the wiring, connection, or module fault repaired before clearing sticks.

Read & clear P0657 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX