P0659

Actuator Supply Voltage A Circuit High

Q: Is it safe to drive with P0659?

Use caution. If the affected supply feeds injectors or coils, the engine can run poorly, stall, or fail to start. Have it diagnosed before relying on the car.

Q: Can I just clear P0659?

It clears, but returns while the supply circuit reads high. Find the short or overcharge condition and repair it first.

Actuator power supply Generic OBD-II High

What it means

P0659 means the ECM sees the "A" actuator power-supply circuit reading higher than expected. That supply feeds output devices such as injectors, coils, or solenoids, so an over-voltage condition can disable several of them at once. Effects range from reduced power and rough running to a no-start, depending on which actuators share the circuit.

High

Can I keep driving? Risky — the ECM's actuator power supply reads high, which can knock out injectors, coils, or valves that share it. Depending on what's fed, the engine may run poorly, stall, or not start.

Real-world scan data

Seen in

104

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of P0659 scans

P0562in 51.0% of scans

P204Fin 51.0% of scans

P2201in 49.0% 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
Reduced power or limp mode
Rough idle or stalling
Multiple actuator faults, or a no-start, if the affected supply feeds critical devices

Common causes

Most likely first

Short to voltage in the actuator supply 'A' circuit wiringLikely
Damaged or chafed wiring feeding the actuatorsCommon
Corroded or loose connectors on the supply circuitCommon
Overcharging / high system voltage upstreamLess often
Internal ECM driver fault (checked last)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and check overall charging voltage first to rule out a system-wide overcharge.
Inspect the actuator supply 'A' wiring and connectors for a short to voltage, chafing, or corrosion.
Identify which actuators share supply 'A' and check them for a fault back-feeding the circuit.
Measure the supply voltage at the ECM against the manufacturer's spec.
Repair the wiring; replace and program the ECM only if its driver is confirmed faulty.

FAQ

Quick answers

Is it safe to drive with P0659?+

Use caution. If the affected supply feeds injectors or coils, the engine can run poorly, stall, or fail to start. Have it diagnosed before relying on the car.

Can I just clear P0659?+

It clears, but returns while the supply circuit reads high. Find the short or overcharge condition and repair it first.

Read & clear P0659 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