What Does P3447 Mean?
The ECM has detected an abnormally low voltage in the cylinder 6 exhaust valve control solenoid circuit. The circuit voltage is below the expected threshold due to a short to ground condition. This prevents proper control of the cylinder 6 exhaust valve for deactivation mode.
Common Causes
40%
Short to ground in the cylinder 6 exhaust valve solenoid wiring harness
30%
Internally shorted cylinder 6 exhaust valve solenoid coil
20%
Moisture or contamination at the VLOM connector creating a low-resistance path to ground
10%
ECM driver malfunction holding the circuit ground-side low
Diagnostic Steps
1
Step 1: Disconnect the cylinder 6 exhaust valve solenoid. Clear the DTC and see if it returns. If it clears, the solenoid is shorted internally.
2
Step 2: Measure the solenoid coil resistance — values below 3 ohms confirm an internal short. Normal range is 5-12 ohms.
3
Step 3: With the solenoid disconnected, measure resistance from each harness wire to chassis ground. Readings below 10K ohms indicate a wiring short.
4
Step 4: Inspect the harness for chafed insulation, pinch points, or heat damage along the routing path from the VLOM to the ECM.
5
Step 5: If external tests are normal, monitor the ECM driver command versus actual circuit voltage using the scan tool to identify an ECM driver fault.
Estimated Repair Cost
$100 - $650
Parts + labor, varies by vehicle and location
The ECM has detected an abnormally low voltage in the cylinder 6 exhaust valve control solenoid circuit. The circuit voltage is below the expected threshold due to a short to ground condition. This prevents proper control of the cylinder 6 exhaust valve for deactivation mode.
The most common cause of P3447 (Cylinder 6 Exhaust Valve Control Circuit Low) is: Short to ground in the cylinder 6 exhaust valve solenoid wiring harness
Typical repair costs for P3447 range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. Cylinder deactivation will be disabled. A persistent short to ground can cause excessive ECM driver current draw, so timely repair is recommended.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3447 to identify the root cause.
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Quick Info
Category
Powertrain
System
Cylinder Deactivation System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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