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DTC codes / P34xx · Auxiliary emission controls / P3419

P3419Cylinder 3 Deactivation/lntake Valve Control Circuit Low

P3419 indicates that the powertrain control module (PCM) has detected an abnormally low voltage on the control circuit for the cylinder 3 deactivation or intake valve control solenoid. This circuit is used on engines with cylinder deactivation or variable valve timing to disable or adjust the intake valve for cylinder 3, and a low voltage reading means the PCM sees a short to ground or an open circuit on the control side.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaAuxiliary emission controls

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Rough idle or misfire-like shuddering, especially when the engine transitions between full and reduced displacement modes
  • Reduced engine power or a limp-home mode if the fault triggers protective strategies
  • Poor fuel economy because the engine may stay in full-displacement mode
  • Audible ticking or abnormal engine noise from the affected cylinder bank in some cases

Common causes, most likely first

  1. Damaged or chafed wiring in the cylinder 3 deactivation solenoid control circuit, often near exhaust heat or sharp edges
  2. Corroded or loose electrical connector at the deactivation solenoid or at the PCM
  3. Failed cylinder 3 deactivation or intake valve control solenoid with an internal short to ground
  4. Open circuit inside the solenoid coil or a broken wire between the PCM and the solenoid
  5. PCM driver circuit fault, though this is less common than wiring or solenoid issues
  6. Oil sludge or debris blocking the solenoid screen, causing abnormal current draw that sets a low-voltage code

How to diagnose and fix it

  1. Scan all modules for stored and pending codes, then verify that P3419 is current and not a history code from a previous repair
  2. Visually inspect the cylinder 3 deactivation solenoid connector and the wiring harness for chafing, corrosion, or loose pins
  3. Measure resistance across the solenoid coil and compare it to the manufacturer's specification to rule out an open or shorted solenoid
  4. Back-probe the control circuit at the PCM and check for a short to ground with the ignition on and the engine off
  5. Perform a wiggle test on the harness while monitoring the circuit with a multimeter or scan tool to catch intermittent faults
  6. If the circuit tests good, command the solenoid on and off with a scan tool to confirm the PCM driver is functioning
  7. Replace the faulty solenoid or repair the damaged wiring, clear the codes, and verify the repair with a road test that includes cylinder deactivation transitions

What the low-voltage code really means

  • A low-voltage code on a solenoid control circuit often points to a short to ground rather than a failed solenoid, so inspect the harness before replacing parts
  • Cylinder deactivation solenoids can fail intermittently when hot, so a cold resistance check may pass even though the solenoid is faulty
  • Oil sludge or debris in the solenoid screen can cause abnormal current draw that sets a low-voltage code without any wiring fault
  • The PCM may disable cylinder deactivation entirely when this code is set, masking the original symptom and leading some technicians to chase a misfire that is not present
  • Aftermarket remote start or alarm wiring tapped into the harness near the PCM can introduce a short to ground that sets this code

Can I keep driving with P3419?

You can usually drive the vehicle with this code, but avoid heavy loads and sustained high-speed driving because the engine may stay in full-displacement mode and run less efficiently. If the check engine light flashes or you feel a strong misfire, stop driving and have the vehicle inspected promptly.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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