What Does P3488 Mean?
The PCM detects abnormally high voltage in the cylinder 11 exhaust valve control circuit. This indicates an open in the ground circuit, short to voltage, or solenoid driver circuit malfunction.
Common Causes
35%
Open ground circuit from exhaust valve control solenoid to PCM or chassis
25%
Short to battery voltage in control circuit wiring
20%
Failed exhaust valve control solenoid with internal open creating high resistance
15%
Corroded ground terminal or poor ground connection at PCM or engine block
5%
PCM driver circuit failure causing improper voltage regulation
Diagnostic Steps
1
Step 1: Check voltage at exhaust valve control solenoid connector with key on, engine off; should be 0V until commanded
2
Step 2: Verify ground circuit continuity from solenoid connector to PCM and to chassis ground
3
Step 3: Inspect all ground connections for corrosion, looseness, or damage; clean and tighten as needed
4
Step 4: Check for chafed wiring that may be contacting voltage sources during engine movement
5
Step 5: Monitor PCM command signal versus actual circuit voltage to identify driver circuit issues
Estimated Repair Cost
$100 - $850
Parts + labor, varies by vehicle and location
The PCM detects abnormally high voltage in the cylinder 11 exhaust valve control circuit. This indicates an open in the ground circuit, short to voltage, or solenoid driver circuit malfunction.
The most common cause of P3488 (Cylinder 11 Exhaust Valve Control Circuit High) is: Open ground circuit from exhaust valve control solenoid to PCM or chassis
Typical repair costs for P3488 range from $100 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but repair soon to avoid performance loss and potential engine damage. High voltage conditions may damage PCM driver circuits if left unrepaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3488 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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