What Does P3451 Mean?
The PCM has detected a voltage signal lower than expected in the cylinder 7 intake valve control circuit. This indicates a short to ground or excessive current draw in the deactivation solenoid circuit.
Common Causes
40%
Short to ground in wiring harness to cylinder 7 intake valve solenoid
35%
Failed cylinder 7 intake valve control solenoid with internal short
15%
Corroded or damaged connector pins causing short circuit
10%
PCM driver circuit failure
Diagnostic Steps
1
Step 1: Disconnect cylinder 7 intake valve solenoid connector and measure resistance; compare to specifications (typically 4-12 ohms)
2
Step 2: Check for continuity between solenoid control wire and ground with solenoid disconnected; should be infinite resistance
3
Step 3: Inspect wiring harness routing for pinch points, melted insulation, or contact with hot engine components
4
Step 4: Check connector terminals for corrosion, bent pins, or moisture intrusion; clean and repair as needed
5
Step 5: If wiring and solenoid test normal, suspect PCM driver circuit fault; may require PCM replacement
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected a voltage signal lower than expected in the cylinder 7 intake valve control circuit. This indicates a short to ground or excessive current draw in the deactivation solenoid circuit.
The most common cause of P3451 (Cylinder 7 Deactivation/Intake Valve Control Circuit Low) is: Short to ground in wiring harness to cylinder 7 intake valve solenoid
Typical repair costs for P3451 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive short distances but repair soon. May cause rough idle, misfires, and reduced fuel economy.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3451 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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