P1400
EGRC Solenoid Valve Circuit Malfunction
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The P1400 code on Nissan vehicles relates to the Exhaust Gas Recirculation Control (EGRC) solenoid valve circuit. The EGRC solenoid controls vacuum flow to the EGR valve, which recirculates a small amount of exhaust gas back into the combustion chambers to reduce nitrogen oxide (NOx) emissions and lower combustion temperatures. When the solenoid valve circuit malfunctions, the EGR system cannot operate correctly.
The good news is that this code rarely causes noticeable drivability problems. In most cases, the only symptom is the check engine light itself. You may notice a very slight rough idle or occasional engine knock under heavy load, but many drivers report no performance changes at all. The primary concern is emissions — your vehicle will likely fail a smog or emissions test with this code active.
Repair often starts with cleaning the EGR system. Carbon buildup is extremely common in EGR passages and can cause the solenoid or EGR valve to stick. A thorough cleaning of the solenoid, EGR valve, and passages may resolve the issue without replacing any parts. If the solenoid itself has failed electrically, replacement parts are inexpensive ($20–$60) and the job is straightforward on most Nissan engines. Professional repair typically costs $100–$350.
Severity
Symptoms
- •Check engine light is on
- •Slight rough idle in some cases
- •No other noticeable drivability issues in most cases
- •May notice a slight ping or knock under heavy load
- •Vehicle may fail emissions testing
- •Occasional hesitation at low RPM
Likely Causes
The EGR control solenoid valve has failed electrically or is stuck due to carbon buildup, preventing it from controlling vacuum to the EGR valve.
Carbon deposits have clogged the EGR passages or the solenoid valve ports, restricting or blocking exhaust gas flow and causing the solenoid to behave abnormally.
A cracked, disconnected, or deteriorated vacuum hose between the solenoid and EGR valve prevents proper vacuum signal delivery.
Damaged, corroded, or loose wiring or connectors in the EGRC solenoid circuit prevent the ECM from properly controlling the valve.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Clean carbon buildup from EGR passages and solenoid valve
- Replace the EGRC solenoid valve
- Inspect and replace cracked or disconnected vacuum hoses
- Check and repair wiring and connectors to the solenoid