Cylinder 6 Exhaust Valve Control Circuit High
Code P3448 indicates that the powertrain control module (PCM) has detected a high voltage condition in the exhaust valve control circuit for cylinder 6. This circuit controls the variable valve timing or cylinder deactivation system, and a high voltage reading suggests a short to power, open circuit, or faulty component. Common causes include a defective exhaust valve actuator solenoid, wiring issues, or a PCM fault.
01. Most Common Causes
- Faulty cylinder 6 exhaust valve actuator solenoid
- Short to power in the control circuit wiring
- Open or high resistance in the circuit
- Corroded or damaged connector at the actuator
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced engine power or performance
- Poor fuel economy
- Possible engine stalling
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the wiring and connector for cylinder 6 exhaust valve actuator for damage, corrosion, or loose pins.
Step 3: Measure voltage at the actuator connector with key on; should be battery voltage. If high (e.g., >12.6V), check for short to power.
Step 4: Test the actuator solenoid resistance; compare to specs (typically 10-30 ohms). Replace if out of range.
Step 5: Clear codes and test drive; if code returns, check PCM for faults or perform a circuit continuity test.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause engine misfire, reduced performance, and potential damage to the catalytic converter. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and part replacement, but can be higher if the PCM needs replacement.