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DTC codes / Nissan codes / P1400

P1400 · NissanEGRC Solenoid Valve

P1400 on Nissan vehicles indicates that the engine control module (ECM) has detected an electrical fault in the exhaust gas recirculation control (EGRC) solenoid valve circuit. The ECM monitors the solenoid's command signal and feedback, and when the voltage or current falls outside the expected range, it stores this code and illuminates the check engine light.

SystemPowertrain
Code typeNissan specific
SeverityLow
Fix difficultyIntermediate
AreaAuxiliary emission controls

Symptoms you may notice

  • Check engine light illuminated on the dashboard, often with no other noticeable symptoms.
  • Slight rough idle or stumbling when the engine is cold, especially during the first few minutes after startup.
  • A subtle hesitation or flat spot during light acceleration at low speeds.
  • Occasionally, a faint sulfur or exhaust smell from the engine bay if the valve sticks open.
  • In rare cases, a slight decrease in fuel economy over time due to improper EGR flow.
  • No drivability complaints at all in many instances, with the code being the only evidence of a problem.

Common causes, most likely first

  1. Failed EGRC solenoid valve, often due to a burned-out internal coil or stuck plunger.
  2. Damaged or corroded electrical connector at the solenoid, causing high resistance or intermittent contact.
  3. Broken, chafed, or shorted wire in the solenoid control circuit between the ECM and the valve.
  4. Clogged or restricted EGR passage or valve port, which can overload the solenoid and set the code indirectly.
  5. Faulty engine control module (ECM) driver circuit, though this is less common than valve or wiring issues.
  6. Vacuum leak or disconnected vacuum hose at the EGRC solenoid or EGR valve, affecting solenoid operation.
  7. Corrosion or damage to the solenoid's mounting bolts or ground connection, leading to poor electrical ground.

How to diagnose and fix it

  1. Inspect the EGRC solenoid valve and its electrical connector for obvious damage, corrosion, or loose pins.
  2. Check the solenoid's resistance with a multimeter and compare it to the manufacturer's specification to rule out an open or shorted coil.
  3. Test the solenoid's control circuit for power and ground signals using a multimeter or a noid light while cranking or running the engine.
  4. Inspect the vacuum hoses connected to the EGRC solenoid and EGR valve for cracks, disconnections, or blockages.
  5. Remove and clean the EGR valve and passages if carbon buildup is suspected, as a stuck valve can mimic solenoid failure.
  6. If the solenoid fails electrical tests, replace it with a new unit and clear the code to verify the repair.
  7. If the wiring and solenoid test good, perform a continuity test on the signal wire from the ECM to the solenoid to check for opens or shorts.

Don't Replace the Solenoid Before These Checks

  • A clogged EGR passage can cause the solenoid to work harder and eventually set a P1400 code, so always inspect and clean the passages before condemning the solenoid.
  • The EGRC solenoid on many Nissans is vacuum-operated, and a leaking or disconnected vacuum hose will produce the same symptoms and code as a failed solenoid.
  • Intermittent P1400 codes often trace to a poor ground connection at the solenoid mounting bolt, which is frequently overlooked during diagnosis.
  • Some aftermarket solenoids have different resistance values than the OEM part, leading to repeat codes even after replacement, so always verify the specification.
  • The ECM may set P1400 as a result of a low battery or charging system issue, so check battery voltage and connections before diving into the EGR circuit.

Can I keep driving with P1400?

You can generally continue driving with a P1400 code, as it rarely causes immediate drivability or safety issues. However, avoid prolonged driving with the check engine light on, and address the fault soon to prevent potential EGR system damage or increased emissions.

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 Nissan vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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