What Does P3412 Mean?
The powertrain control module has detected a higher than expected voltage in the control circuit for cylinder 2's intake valve deactivation system. This indicates an electrical fault preventing proper cylinder deactivation operation.
Common Causes
35%
Shorted to voltage in wiring harness between PCM and cylinder 2 intake valve solenoid
30%
Failed intake valve control solenoid with internal short to power
20%
Corroded or damaged electrical connector at valve control solenoid
10%
PCM internal driver circuit failure
5%
Chafed wiring causing intermittent short to battery voltage
Diagnostic Steps
1
Step 1: Inspect cylinder 2 intake valve control solenoid connector for corrosion, damage, or moisture intrusion
2
Step 2: Disconnect the solenoid and measure resistance across solenoid terminals (typically 6-12 ohms); replace if out of specification
3
Step 3: With solenoid disconnected, check for voltage at harness connector with key on; should read 0V (if voltage present, harness is shorted to power)
4
Step 4: Perform wiring continuity test from PCM connector to solenoid connector and check for shorts to voltage or ground
5
Step 5: If all wiring and solenoid test good, verify PCM driver circuit operation with a lab scope or substitute known-good PCM
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The powertrain control module has detected a higher than expected voltage in the control circuit for cylinder 2's intake valve deactivation system. This indicates an electrical fault preventing proper cylinder deactivation operation.
The most common cause of P3412 (Cylinder 2 Deactivation/Intake Valve Control Circuit High) is: Shorted to voltage in wiring harness between PCM and cylinder 2 intake valve solenoid
Typical repair costs for P3412 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 may experience reduced fuel economy and rough idle. Continued operation may cause catalytic converter damage due to improper fuel trim.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3412 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
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