What Does P3487 Mean?
The PCM detects abnormally low voltage in the cylinder 11 exhaust valve control circuit. This indicates a short to ground or excessive current draw in the control system.
Common Causes
40%
Short to ground in wiring harness between PCM and exhaust valve solenoid
30%
Exhaust valve control solenoid internal short to ground
15%
Damaged or pinched wiring causing intermittent ground contact
10%
Connector contamination with moisture or oil causing low resistance path
5%
PCM internal short circuit in driver stage
Diagnostic Steps
1
Step 1: Disconnect exhaust valve control solenoid connector and measure resistance from solenoid control wire to ground (should be infinite)
2
Step 2: Measure resistance of the solenoid itself to ground; low resistance indicates internal short
3
Step 3: Inspect wiring harness routing for damage, especially where it contacts sharp edges or hot components
4
Step 4: Check for oil or coolant contamination in connectors that could create conductive paths
5
Step 5: If wiring and solenoid test normal, verify PCM driver circuit is not internally shorted
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The PCM detects abnormally low voltage in the cylinder 11 exhaust valve control circuit. This indicates a short to ground or excessive current draw in the control system.
The most common cause of P3487 (Cylinder 11 Exhaust Valve Control Circuit Low) is: Short to ground in wiring harness between PCM and exhaust valve solenoid
Typical repair costs for P3487 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle can be driven but may experience reduced performance and fuel economy. Risk of PCM damage if short circuit is severe; repair promptly to prevent additional component failure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3487 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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