P0658 - Actuator Supply Voltage Circuit Low
The P0658 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the actuator supply voltage circuit. This circuit provides power to various actuators such as throttle control, transmission solenoids, and variable valve timing components. A low voltage reading suggests a short to ground, open circuit, or a failing voltage regulator, which can disrupt actuator operation and affect vehicle performance.
01. Most Common Causes
- Short to ground in the actuator supply voltage circuit
- Open circuit or high resistance in the wiring or connectors
- Faulty PCM or internal voltage regulator failure
- Blown fuse or fusible link in the actuator supply circuit
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Transmission shifting issues
- Erratic operation of actuators (e.g., throttle, VVT)
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data.
Step 2: Visually inspect the actuator supply voltage circuit wiring and connectors for damage, corrosion, or loose connections.
Step 3: Measure voltage at the actuator supply circuit with a multimeter; compare to manufacturer specifications (typically 5V or 12V).
Step 4: Check for shorts to ground or opens by testing continuity between the circuit and ground, and between the PCM and actuator.
Step 5: If circuit is intact, test the PCM's voltage output; if low, replace the PCM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as low actuator voltage can cause unpredictable behavior, reduced performance, and potential transmission damage. Limp mode may activate, limiting speed and drivability.
How much does it cost to fix?▼
Repair costs typically range from $50 to $150 for wiring repairs or fuse replacement. PCM replacement can cost $500-$1000 or more, including programming.