P0405 on Hyundai: How to Diagnose & Fix
Exhaust Gas Recirculation Sensor 'A' Circuit Low
1 Hyundai model · 1 documented issue · 1 critical
P0405 on Hyundai by model: symptoms, diagnosis and fix
A sensor inside the EGR valve may have been contaminated with solder flux during supplier manufacturing and can short. Because the EGR valve and crank position sensor share a power circuit, the short can turn on the check-engine light or cause a sudden loss of motive power, which increases the risk of a crash. Applies to: Certain 2024 Hyundai Venue vehicles with the Gamma 1.6L MPI engine built January 12 – March 4, 2024 (2,364 Venues; the recall also covers some 2024 Elantra and Kona). Hyundai campaign 260. Only a Hyundai dealer can confirm whether a specific VIN is included and whether the repair has been done.
How to Fix
Have a Hyundai dealer check the VIN for recall 24V308 (campaign 260). The remedy is replacement of the EGR valve assembly and its gasket at no cost to the owner; Hyundai also offers reimbursement for eligible out-of-pocket repairs of this condition under its plan filed with NHTSA. This is engine-bay electrical and emissions work; no DIY repair or retail part is recommended.
Sources for this issue (2)
P0405 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0405 mean on a Hyundai?
P0405 stands for "Exhaust Gas Recirculation Sensor 'A' Circuit Low." P0405 is a generic OBD-II code meaning the engine computer detected an abnormally low voltage signal from the Exhaust Gas Recirculation (EGR) sensor 'A' circuit. This sensor reports the EGR valve's position or flow, which the computer uses to control exhaust gas recirculation for lowering emissions and combustion temperatures. A low signal indicates the reading is below the expected range, often due to a wiring or sensor fault. It mainly affects emissions and may cause light drivability issues but is not an immediate safety concern. On Hyundai it is documented across 1 model: Venue.
What are the most common causes of P0405?
The most common causes of P0405 are: Faulty EGR position sensor (or DPFE sensor), Open, shorted, or corroded EGR sensor wiring/connector, EGR valve stuck or carbon-clogged, Loss of reference voltage or ground to the sensor, Poor connector contact / pin corrosion, Damaged EGR valve assembly, PCM fault (rare). The specific cause varies by vehicle.
How much does it cost to fix P0405 on a Hyundai?
Repair costs vary widely with the root cause and Hyundai model; each issue on this page carries its own estimate where one is published.
Looking for P0405 on a different make?
View P0405 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.