Actuator Supply Voltage Circuit Low
The P2670 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 variable valve timing solenoids, transmission shift solenoids, or other electronic actuators. A low voltage reading suggests a short to ground, open circuit, or a failing component that is drawing excessive current, potentially causing erratic actuator operation or failure.
1. Most Common Causes
- Blown fuse or open fusible link in the 'B' supply circuit
- Open circuit or short to ground in the 'B' supply voltage wiring harness
- Corroded, loose, or damaged connectors in the supply circuit
- Actuator (solenoid/valve) with internal short circuit draining the circuit
- Internal failure of the reference voltage driver in the PCM/ECM
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission shifting issues (harsh or delayed shifts)
- Engine performance problems (rough idle, stalling, reduced power)
- Variable valve timing malfunction (if applicable)
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Inspect the actuator supply 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 12V or 5V).
Step 4: Test the actuator(s) for internal shorts or excessive current draw using a multimeter or test light.
Step 5: If circuit and actuator are okay, check PCM for faults; reprogram or replace if necessary.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause transmission or engine performance issues, potentially leading to unsafe driving conditions or further damage.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, depending on the root cause. Replacing an actuator can cost $100-$300, while wiring repairs are usually $50-$150. PCM replacement is more expensive.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.