What Does P3460 Mean?
The PCM has detected abnormally high voltage in the cylinder 8 intake valve control circuit. This typically indicates a short to power condition or an open ground circuit in the valve control solenoid circuit.
Common Causes
35%
Wiring harness shorted to battery voltage or another power source
30%
Open ground circuit at valve control solenoid or connector
20%
Internal open circuit in cylinder 8 intake valve control solenoid winding
10%
Damaged connector with terminals touching power circuits
5%
PCM internal driver circuit failure providing constant high signal
Diagnostic Steps
1
Step 1: With ignition off and solenoid disconnected, check for unexpected voltage at solenoid connector harness side (should be 0V)
2
Step 2: Verify ground circuit integrity by measuring resistance from solenoid ground terminal to battery negative (should be <1 ohm)
3
Step 3: Check for voltage at control wire from PCM with ignition on, solenoid disconnected (should see 0-12V pulsing during active test)
4
Step 4: Inspect wiring harness for damage where it may contact alternator, battery cables, or other high-current circuits
5
Step 5: Test cylinder 8 intake valve solenoid by applying 12V directly with ground and listening for clicking; measure current draw (typically 0.5-2A)
Estimated Repair Cost
$130 - $950
Parts + labor, varies by vehicle and location
The PCM has detected abnormally high voltage in the cylinder 8 intake valve control circuit. This typically indicates a short to power condition or an open ground circuit in the valve control solenoid circuit.
The most common cause of P3460 (Cylinder 8 Deactivation/Intake Valve Control Circuit High) is: Wiring harness shorted to battery voltage or another power source
Typical repair costs for P3460 range from $130 to $950, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive with no immediate safety concerns. Fuel economy will be reduced and cylinder deactivation feature 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 P3460 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
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