P3407 — Cylinder 1 Exhaust Valve Control Circuit Low

What are the symptoms of P3407?

Drivers most often notice: Check Engine Light on, possible limp mode depending on the affected component, increased fuel consumption in some cases, the affected system operates intermittently or not at all.

How much does it cost to fix P3407?

Replace the faulty sensor or actuator — $150–$500; Control module repair — $300–$1,000; Repair wiring or connectors — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What does OBD2 code P3407 mean?

OBD2 code P3407 flags a problem with the sensor and actuator circuits (cylinder 1 exhaust valve control circuit low). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, corroded, loose or damaged connector, poor ground connection.

Is it safe to drive with P3407?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

Will P3407 clear itself?

Sometimes P3407 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does P3407 mean?

Behind P3407 is a specific failure in the sensor and actuator circuits: cylinder 1 exhaust valve control circuit low. The onboard computer stores it in the powertrain (engine/transmission) group after verifying the fault over repeated checks.

P3407 refers specifically to cylinder 1. On inline engines cylinders are counted from the front (belt end); on V-engines the numbering depends on the manufacturer, so check the firing-order diagram for your exact model. Location matters for the repair bill: some cylinders require intake manifold removal, which adds labor time.

“Circuit low” means the voltage on the cylinder 1 exhaust valve control circuit stays below the expected minimum — close to ground. The usual physical reasons are a short to ground, a chafed wire touching metal, a missing supply voltage, or a failed component dragging the signal down.

To set P3407, the control module compares live readings of the sensor and actuator circuits against calibrated limits, usually over several drive cycles. Alongside the code it stores a freeze frame — a snapshot of rpm, load, coolant temperature and vehicle speed at the moment of failure. Reading that snapshot first saves diagnostic time.

What causes P3407?

• failed cylinder 1 exhaust valve control pulling the signal low
• missing supply voltage to the cylinder 1 exhaust valve control
• signal wire shorted to ground (chafed insulation)
• corroded, loose or damaged connector
• blown fuse feeding the circuit
• faulty sensor or actuator of the affected circuit
• open or shorted wiring in the circuit
• control module driver fault

Common symptoms of P3407

• Check Engine Light on
• possible limp mode depending on the affected component
• increased fuel consumption in some cases
• the affected system operates intermittently or not at all

How to diagnose P3407

1. Connect an OBD2 scanner, confirm P3407 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
3. Visually inspect the wiring harness and connectors related to the cylinder 1 exhaust valve control for damage, corrosion, chafing or poor contact.
4. Check for supply voltage at the cylinder 1 exhaust valve control connector first; then measure resistance from the signal wire to ground — near-zero ohms confirms a short to ground in the harness.
5. Measure reference voltage, ground and signal continuity at the component connector.
6. Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
7. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P3407 does not return.

How to fix P3407

Start with the cheapest and most common causes before replacing expensive parts:

• Replace the faulty sensor or actuator — $150–$500
• Control module repair — $300–$1,000
• Repair wiring or connectors — $80–$250

How much does it cost to fix P3407?

Repair cost depends on which component actually failed. Typical scenarios for P3407 (parts and labor, USD, independent shop rates):

• Replace the faulty sensor or actuator: $150–$500
• Control module repair: $300–$1,000
• Repair wiring or connectors: $80–$250

Overall, fixing P3407 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P3407?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

Related OBD2 codes

• P3400: Cylinder Deactivation System Bank 1
• P3401: Cylinder 1 Deactivation/Intake Valve Control Circuit/Open
• P3402: Cylinder 1 Deactivation/Intake Valve Control Circuit Performance
• P3403: Cylinder 1 Deactivation/Intake Valve Control Circuit Low
• P3404: Cylinder 1 Deactivation/Intake Valve Control Circuit High
• P3405: Cylinder 1 Exhaust Valve Control Circuit/Open