What Does P3449 Mean?
The PCM has detected an open circuit condition in the cylinder 7 intake valve control circuit used for cylinder deactivation. The electrical circuit is not completing the path necessary for proper valve control operation.
Common Causes
35%
Disconnected or loose connector at cylinder 7 intake valve solenoid
30%
Open circuit or broken wire in harness to cylinder 7 solenoid
25%
Failed cylinder 7 intake valve control solenoid with open coil
10%
Corroded or damaged connector pins causing poor contact
Diagnostic Steps
1
Step 1: Inspect connector at cylinder 7 intake valve solenoid for proper seating and visual damage
2
Step 2: Measure resistance of cylinder 7 intake valve solenoid and compare to specifications
3
Step 3: Test continuity of wiring from PCM to solenoid on both power and ground circuits
4
Step 4: Inspect wiring harness routing for damage, cuts, or breaks along entire length
5
Step 5: Clean and inspect connector terminals for corrosion or improper contact tension
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit condition in the cylinder 7 intake valve control circuit used for cylinder deactivation. The electrical circuit is not completing the path necessary for proper valve control operation.
The most common cause of P3449 (Cylinder 7 Deactivation/Intake Valve Control Circuit/Open) is: Disconnected or loose connector at cylinder 7 intake valve solenoid
Typical repair costs for P3449 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to operate but cylinder 7 deactivation will not function. Fuel economy will be reduced and slight vibration may be noticed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3449 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing / Cylinder Deactivation System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
