P0404 on Volkswagen
Exhaust Gas Recirculation Circuit Range/Performance
P0404 on Volkswagen vehicles indicates exhaust gas recirculation circuit range/performance. Au7o has documented this code across 6 Volkswagen models — most commonly on Atlas, Atlas Cross Sport, CC. This code means the exhaust gas recirculation (EGR) system isn't performing within its expected range. The EGR valve routes a metered amount of exhaust gas back into the intake to lower combustion temperatures and reduce nitrogen-oxide emissions, and the computer monitors the valve's actual position versus what it commanded. When the valve sticks, moves incorrectly, or the feedback doesn't match the command, P0404 sets. This can cause rough idle, hesitation, pinging, and increased emissions. Typical repair costs on Volkswagen range from $100 to $6,000, depending on the specific model and root cause.
Common Causes of P0404
- •Carbon buildup clogging the EGR valve or passages
- •Sticking or failed EGR valve
- •Faulty EGR position sensor
- •Corroded or loose EGR connector
- •Damaged or shorted EGR wiring
- •Vacuum leak or failed vacuum control (on vacuum-operated systems)
- •Clogged EGR cooler or tubes
- •Faulty PCM/ECM (rare)
P0404 on Volkswagen by Model
Volkswagen Atlas(1 issue)
- 8-Speed Automatic Transmission Rough Shifting and Shudder2018-2024
The Aisin 8-speed automatic transmission (AWF8G45) in the Atlas develops rough shifting, hesitation, and shudder, particularly in the 2-3 and 3-4 gear transitions. The torque converter lockup clutch can shudder at highway speeds (40-65 mph). VW has released multiple transmission software updates (TCU reflash) to address shift quality, but hardware issues including valve body wear and torque converter degradation can require physical repairs.
Volkswagen Atlas Cross Sport(1 issue)
- Rear Taillight Seal Water Intrusion2020-2023
Like its Atlas sibling, the Atlas Cross Sport suffers from water intrusion through rear taillight seals. The sloped rear design makes it particularly susceptible to water running down and entering through degraded gaskets. Water accumulates in the spare tire well and cargo area, causing mold, corrosion, and potential electrical damage to rear components.
Volkswagen CC(1 issue)
- Plastic Water Pump and Thermostat Housing Leak2009-2017
The CC shares the EA888 engine's plastic water pump and thermostat housing failure common to the VW/Audi 2.0T platform. The plastic housing cracks from thermal cycling, causing coolant leaks that can lead to engine overheating. The failure is gradual, starting with weeping that becomes a full leak. The CC's engine bay heat retention (due to the coupe-like design) can accelerate the plastic degradation.
Volkswagen Golf(1 issue)
- EA888 Plastic Water Pump and Thermostat Housing Failure2008-2020
The EA888 2.0T engine uses a plastic water pump housing and thermostat that are prone to cracking and leaking coolant. The plastic degrades from heat cycling, causing external leaks, overheating, and potential engine damage if not caught early. VW issued TSB 19-15-01 addressing the updated water pump assembly. The failure typically occurs between 50,000-100,000 miles. Coolant may leak onto the timing cover or drip from the front of the engine.
Volkswagen Jetta(1 issue)
- Water Pump/Thermostat Housing Failure2008-2019
The plastic water pump and thermostat housing are prone to cracking and leaking. The impeller inside the water pump can also degrade. This is a common failure point on the EA888 engine, often occurring between 60,000-100,000 miles.
Volkswagen Touran(1 issue)
- 1.6 / 2.0 TDI (EA189) EGR Valve Failure, Worsened by the Dieselgate Emissions Fix2009-2015
The EA189-family TDI diesels (1.6 and 2.0 TDI) suffer frequent EGR valve failures from carbon/soot build-up that jams the valve. The problem became markedly worse after the Dieselgate emissions software fix, which makes the EGR system work harder and has been widely linked to premature EGR failures. Owners report the valve jamming and the engine going into limp mode, with several quoted around £1,400-£1,500 for replacement. Volkswagen has, in many cases, refunded owners for EGR failures occurring after the emissions update.
Looking for P0404 on a different make?
View P0404 across all makes →Frequently Asked Questions
What does P0404 mean on Volkswagen?▼
P0404 stands for "Exhaust Gas Recirculation Circuit Range/Performance." This code means the exhaust gas recirculation (EGR) system isn't performing within its expected range. The EGR valve routes a metered amount of exhaust gas back into the intake to lower combustion temperatures and reduce nitrogen-oxide emissions, and the computer monitors the valve's actual position versus what it commanded. When the valve sticks, moves incorrectly, or the feedback doesn't match the command, P0404 sets. This can cause rough idle, hesitation, pinging, and increased emissions. On Volkswagen specifically, this code is documented across 6 models.
What causes P0404 on Volkswagen vehicles?▼
Common causes on Volkswagen: Carbon buildup clogging the EGR valve or passages, Sticking or failed EGR valve, Faulty EGR position sensor, Corroded or loose EGR connector, Damaged or shorted EGR wiring. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0404 on a Volkswagen?▼
Repair costs on Volkswagen range from $100 to $6,000, depending on the specific model and root cause.
Which Volkswagen models have P0404 documented?▼
Au7o has documented P0404 on 6 Volkswagen models: Atlas, Atlas Cross Sport, CC, Golf, Jetta, Touran.