P3418 — Cylinder 3 Deactivation/Intake Valve Control Circuit Performance

For Ford vehicles

cylinder 3 deactivation/intake valve control circuit – range/performance problem

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK 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.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm P3418 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs 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. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the cylinder 3 deactivation/intake valve control for damage, corrosion, chafing or poor contact.
  4. Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
  5. Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P3418 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P3418 (parts and labor, USD, independent shop rates): Repair wiring or connectors: $80–$250; Control module repair: $300–$1,000; Replace the faulty sensor or actuator: $150–$500. Overall, fixing P3418 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.

Common questions

Is it safe to drive with P3418?

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.

How much does it cost to fix P3418?

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

What is the most common cause of P3418?

The most common causes are: open or shorted wiring in the circuit, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.

Will P3418 clear itself?

Sometimes P3418 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 are the symptoms of P3418?

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

What does P3418 mean?

P3418 is logged by the onboard diagnostics when the sensor and actuator circuits does not behave as expected. The official definition is “Cylinder 3 Deactivation/Intake Valve Control Circuit Performance”. This is a powertrain (engine/transmission) category code.

P3418 refers specifically to cylinder 3. 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.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P3418 and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.

What causes P3418?

  • poor ground connection
  • open or shorted wiring in the circuit
  • faulty sensor or actuator of the affected circuit
  • blown fuse feeding the circuit
  • control module driver fault
  • corroded, loose or damaged connector

Common symptoms of P3418

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

How to diagnose P3418

  1. Connect an OBD2 scanner, confirm P3418 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 3 deactivation/intake valve control for damage, corrosion, chafing or poor contact.
  4. Measure reference voltage, ground and signal continuity at the component connector.
  5. Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
  6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P3418 does not return.

How to fix P3418

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

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

How much does it cost to fix P3418?

Repair cost depends on which component actually failed. Typical scenarios for P3418 (parts and labor, USD, independent shop rates):

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

Overall, fixing P3418 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 P3418?

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