What Does P3458 Mean?
The PCM detects that the cylinder 8 intake valve control system is not performing as expected during cylinder deactivation. The system is operating but not meeting performance parameters for proper valve control or deactivation timing.
Common Causes
35%
Sticking or mechanically binding intake valve lifter/rocker assembly on cylinder 8
25%
Low engine oil pressure or contaminated oil affecting hydraulic valve control
20%
Worn or failing intake valve control solenoid with intermittent operation
15%
Restricted oil passages to cylinder 8 valve control mechanism
5%
Weak or damaged return spring in lifter deactivation mechanism
Diagnostic Steps
1
Step 1: Check engine oil level and condition; verify proper oil viscosity is being used per manufacturer specifications
2
Step 2: Measure engine oil pressure with mechanical gauge to rule out low oil pressure as root cause
3
Step 3: Remove valve cover and inspect cylinder 8 lifter/rocker assembly for mechanical binding, wear, or damage
4
Step 4: Using scan tool active tests, command cylinder 8 deactivation on/off while monitoring oil pressure and system response time
5
Step 5: Remove and inspect intake valve control solenoid for screen blockage, internal wear, or contamination
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The PCM detects that the cylinder 8 intake valve control system is not performing as expected during cylinder deactivation. The system is operating but not meeting performance parameters for proper valve control or deactivation timing.
The most common cause of P3458 (Cylinder 8 Deactivation/Intake Valve Control Circuit Performance) is: Sticking or mechanically binding intake valve lifter/rocker assembly on cylinder 8
Typical repair costs for P3458 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but fuel economy suffers. May experience rough idle or hesitation when system attempts to activate/deactivate cylinder 8.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3458 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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