What Does P3492 Mean?
The PCM detected abnormally high voltage in the control circuit for cylinder 12's intake valve deactivation system. This indicates an electrical fault preventing proper control of the variable valve timing or cylinder deactivation mechanism.
Common Causes
35%
Shorted intake valve control solenoid or wiring harness
25%
Failed PCM output driver circuit
20%
Damaged or corroded connector pins at solenoid
15%
Chafed wiring causing short to voltage
5%
Failed cylinder deactivation control valve
Diagnostic Steps
1
Step 1: Inspect wiring harness and connector at cylinder 12 intake valve control solenoid for damage, corrosion, or loose connections
2
Step 2: Measure voltage at solenoid connector with key on, engine off - should see battery voltage only when commanded active
3
Step 3: Disconnect solenoid and measure resistance (typically 5-15 ohms); check for short to voltage in harness
4
Step 4: Test PCM output signal with oscilloscope during valve activation command
5
Step 5: If all wiring and solenoid test normal, suspect PCM internal fault
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM detected abnormally high voltage in the control circuit for cylinder 12's intake valve deactivation system. This indicates an electrical fault preventing proper control of the variable valve timing or cylinder deactivation mechanism.
The most common cause of P3492 (Cylinder 12 Deactivation/Intake Valve Control Circuit High) is: Shorted intake valve control solenoid or wiring harness
Typical repair costs for P3492 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains drivable but may experience reduced fuel economy and performance. Cylinder deactivation system will not function properly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3492 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing/Cylinder Deactivation
Difficulty
Type
Generic (SAE)
Recommended Tools
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