Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the computer in your car is having trouble controlling the intake valve for cylinder 8. It's like one of the parts in your engine isn't turning on or off properly.
The P3460 code indicates a problem with the deactivation of the intake valve for cylinder 8, where the control circuit is reading a high voltage.
This code is triggered when the Powertrain Control Module (PCM) detects an abnormal voltage condition in the intake valve control circuit for cylinder 8. This can occur when the circuit is open or shorted, or when a component within the circuit is malfunctioning.
• Check Engine Light illuminated
• Reduced engine performance
• Engine misfire or rough idle
• Faulty intake valve control solenoid
• Open or shorted wiring in the intake valve control circuit
• Faulty PCM
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for cylinder 8's intake valve control circuit.
• Test the intake valve control solenoid for proper operation.
• Replace the intake valve control solenoid if faulty.
• Repair or replace any damaged wiring or connectors.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regular maintenance checks
• Ensure proper oil levels and quality
• Inspect electrical connections periodically
Engine Performance
• Avoid driving the vehicle extensively until repaired.
• Consult with a professional mechanic for an accurate diagnosis.
Repairs may be covered under powertrain warranty if the vehicle is still within the warranty period.
This code is commonly associated with vehicles that have cylinder deactivation technology and can be more prevalent in higher mileage vehicles.
Moderate – Addressing this issue promptly can prevent further engine damage.
Driving with this code can lead to increased emissions and potential engine damage if not addressed.
• Engine at operating temperature
• Vehicle in drive with engine load
The intake valve control solenoid for cylinder 8 is typically located on the cylinder head near the intake manifold.
Q: Can I drive my car with a P3460 code?
A: It's not recommended to drive extensively with this code as it may cause further engine damage.
Q: What happens if I ignore the P3460 code?
A: Ignoring this code can lead to poor engine performance and potential damage to the engine.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.