A weak or failing battery, or poor battery terminal connections; Corroded, loose, or damaged wiring or connectors on the actuator supply circuit; A short to ground or chafed wire in the harness feeding the actuators; A faulty actuator (solenoid or sensor) internally shorted and dragging down the supply voltage; A failing engine control module (ECM) or power supply relay; Blown fuse or fusible link protecting the actuator supply circuit

DTC codes / P06xx · Computer and output circuits / P0658

P0658Actuator Supply Voltage 'A' Circuit Low

Q: What does code P0658 mean?

Actuator Supply Voltage 'A' Circuit Low. P0658 indicates that the engine control module (ECM) has detected a low voltage condition on the supply circuit that feeds a group of actuators, often sensors or solenoids sharing a common power feed. The ECM monitors this circuit and sets the code when the voltage drops below the expected threshold, which can cause multiple components to malfunction or stop working entirely.

P0658 indicates that the engine control module (ECM) has detected a low voltage condition on the supply circuit that feeds a group of actuators, often sensors or solenoids sharing a common power feed. The ECM monitors this circuit and sets the code when the voltage drops below the expected threshold, which can cause multiple components to malfunction or stop working entirely.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Multiple dashboard warning lights or reduced power mode
Rough running or stalling if the affected actuators include fuel or ignition components
Transmission shifting harshly or entering limp mode if solenoids lose power
Inoperative sensors or accessories that share the same supply circuit
Intermittent electrical glitches, such as flickering lights or erratic gauge readings

Common causes, most likely first

A weak or failing battery, or poor battery terminal connections
Corroded, loose, or damaged wiring or connectors on the actuator supply circuit
A short to ground or chafed wire in the harness feeding the actuators
A faulty actuator (solenoid or sensor) internally shorted and dragging down the supply voltage
A failing engine control module (ECM) or power supply relay
Blown fuse or fusible link protecting the actuator supply circuit

How to diagnose and fix it

Perform a battery and charging system test to rule out low system voltage
Inspect and clean battery terminals and ground connections
Check the fuse and relay for the actuator supply circuit, replacing if blown or faulty
Disconnect each actuator on the circuit one at a time to see if the low voltage code clears, isolating a shorted component
Use a multimeter to measure voltage drop along the supply wire and identify high-resistance connections or corrosion
Inspect the wiring harness for chafing, pinched wires, or loose connectors, repairing as needed
If all external circuits and components test good, suspect the ECM and perform pinpoint tests before replacement

Don't overlook shared power feeds

P0658 often appears alongside other codes for sensors or solenoids on the same supply circuit, so always check for multiple codes before condemning a single part.
A shorted actuator can pull down the entire supply voltage, causing unrelated components to set codes; disconnecting each actuator one by one is a quick way to isolate the culprit.
Corrosion inside a connector can create enough resistance to drop voltage under load without any visible damage, so wiggle-test and back-probe connectors during diagnosis.
The ECM itself is rarely the cause, but a failing voltage regulator inside the ECM can mimic a wiring fault; verify power and ground at the ECM before replacement.
This code can be set by a weak battery that still starts the engine, so always load-test the battery and check charging voltage first.

Can I keep driving with P0658?

If the vehicle runs normally, you can drive cautiously to a repair shop, but avoid heavy electrical loads and long trips. If the engine runs rough, stalls, or the transmission shifts erratically, stop driving and have the vehicle towed to prevent further damage.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.