What Does P3407 Mean?
The PCM has detected an abnormally low voltage in the cylinder 1 exhaust valve control circuit. This typically indicates a short to ground in the wiring or solenoid, or excessive current draw.
Common Causes
40%
Wiring harness shorted to ground or engine block
30%
Internal short to ground in exhaust valve control solenoid
20%
Damaged or pinched wires at routing points or connectors
7%
Water intrusion causing short circuit in connector
3%
Failed PCM driver circuit pulling voltage low
Diagnostic Steps
1
Step 1: Disconnect exhaust valve control solenoid connector and recheck for code; if code clears, solenoid is shorted
2
Step 2: Measure resistance from solenoid circuit to ground with solenoid disconnected; should be infinite (open circuit)
3
Step 3: Inspect wiring harness routing for chafing points, heat damage, or contact with sharp edges
4
Step 4: Check for oil or coolant contamination in connectors that could cause short circuits
5
Step 5: Test solenoid resistance and compare to specifications; replace if out of range or shorted
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally low voltage in the cylinder 1 exhaust valve control circuit. This typically indicates a short to ground in the wiring or solenoid, or excessive current draw.
The most common cause of P3407 (Cylinder 1 Exhaust Valve Control Circuit Low) is: Wiring harness shorted to ground or engine block
Typical repair costs for P3407 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is drivable but will experience reduced performance and fuel economy. Short circuit may cause excessive current draw and potential PCM damage if not repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3407 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing/Lift System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
