What Does P3457 Mean?
The PCM has detected an open circuit in the cylinder 8 intake valve control system used for cylinder deactivation. This indicates a complete loss of electrical continuity in the wiring or solenoid circuit that controls the intake valve lifter mechanism for cylinder 8.
Common Causes
35%
Broken or disconnected wiring harness to cylinder 8 intake valve solenoid
30%
Failed intake valve control solenoid for cylinder 8
20%
Corroded or damaged electrical connector pins at solenoid
10%
PCM internal circuit failure for cylinder 8 valve control output
5%
Blown fuse or open circuit in power supply to valve control system
Diagnostic Steps
1
Step 1: Visually inspect wiring harness and connector to cylinder 8 intake valve control solenoid for damage, corrosion, or disconnection
2
Step 2: Measure resistance of cylinder 8 intake valve control solenoid (typical range 10-30 ohms); infinite resistance indicates open circuit in solenoid
3
Step 3: Check for battery voltage at solenoid connector with key on, engine off to verify power supply circuit
4
Step 4: Using a digital multimeter, backprobe PCM connector to verify continuity between PCM and solenoid on control wire
5
Step 5: If all circuits test good, suspect PCM internal driver circuit failure and consider PCM replacement or reprogramming
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit in the cylinder 8 intake valve control system used for cylinder deactivation. This indicates a complete loss of electrical continuity in the wiring or solenoid circuit that controls the intake valve lifter mechanism for cylinder 8.
The most common cause of P3457 (Cylinder 8 Deactivation/Intake Valve Control Circuit/Open) is: Broken or disconnected wiring harness to cylinder 8 intake valve solenoid
Typical repair costs for P3457 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 fuel economy will be reduced. Engine may run roughly or have reduced power when cylinder deactivation attempts to engage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3457 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
A quality scan tool helps you read codes, view live data, and clear faults.
