What Does P3496 Mean?
The PCM detected abnormally high voltage in cylinder 12's exhaust valve control circuit. This electrical fault prevents proper control of the exhaust valve deactivation or timing mechanism.
Common Causes
35%
Short to voltage in wiring harness
25%
Failed exhaust valve control solenoid with internal short to power
20%
Damaged connector with pins touching voltage source
15%
Failed PCM output driver stuck high
5%
Wiring harness rubbing on alternator or other power source
Diagnostic Steps
1
Step 1: Disconnect solenoid connector and check for battery voltage on control circuit wire with key on; should have no voltage
2
Step 2: Inspect wiring harness routing for contact with alternator, power distribution, or other voltage sources
3
Step 3: Measure solenoid resistance and check for internal short to power supply pin
4
Step 4: Test PCM output by monitoring voltage with oscilloscope during activation commands
5
Step 5: Check for aftermarket accessories or modifications that may have caused wiring damage
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM detected abnormally high voltage in cylinder 12's exhaust valve control circuit. This electrical fault prevents proper control of the exhaust valve deactivation or timing mechanism.
The most common cause of P3496 (Cylinder 12 Exhaust Valve Control Circuit High) is: Short to voltage in wiring harness
Typical repair costs for P3496 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains safe to operate but cylinder deactivation feature will be disabled. Fuel economy will be reduced.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3496 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing/Cylinder Deactivation
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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