What Does P3489 Mean?
The PCM detects an open circuit in cylinder 12's intake valve control system used for cylinder deactivation or variable valve timing. Complete loss of electrical continuity prevents intake valve control on this cylinder.
Common Causes
35%
Open or broken wiring between PCM and cylinder 12 intake valve control solenoid
30%
Failed intake valve control solenoid with internal open circuit
20%
Disconnected or severely corroded electrical connector at solenoid
10%
Blown fuse in valve control system power supply circuit
5%
PCM internal driver circuit failure for cylinder 12 intake valve
Diagnostic Steps
1
Step 1: Inspect cylinder 12 intake valve control solenoid connector for proper seating, corrosion, or terminal damage
2
Step 2: Measure resistance across intake valve control solenoid coil; infinite resistance confirms open circuit
3
Step 3: Test continuity of all wires from PCM to solenoid using wiring diagram for proper pin identification
4
Step 4: Verify power supply voltage at solenoid connector matches battery voltage with key on
5
Step 5: If external circuits test normal, verify PCM output driver with oscilloscope or substitute known-good PCM
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM detects an open circuit in cylinder 12's intake valve control system used for cylinder deactivation or variable valve timing. Complete loss of electrical continuity prevents intake valve control on this cylinder.
The most common cause of P3489 (Cylinder 12 Deactivation/Intake Valve Control Circuit/Open) is: Open or broken wiring between PCM and cylinder 12 intake valve control solenoid
Typical repair costs for P3489 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but will not achieve cylinder deactivation mode, reducing fuel economy. May experience rough idle or reduced power depending on system design.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3489 to identify the root cause.
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Quick Info
Category
Powertrain
System
Cylinder Deactivation/Variable Valve Timing System
Difficulty
Type
Generic (SAE)
Recommended Tools
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