P0404 on Chevrolet
Exhaust Gas Recirculation Circuit Range/Performance
P0404 on Chevrolet vehicles indicates exhaust gas recirculation circuit range/performance. Au7o has documented this code across 1 Chevrolet model — most commonly on Colorado. 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 Chevrolet range from $400 to $2,200, 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 Chevrolet by Model
Chevrolet Colorado(1 issue)
- 2.8L Duramax EGR Valve Carbon Clogging and EGR Cooler Weld Seepage Causing Coolant Loss2016-2022
Separate from the DEF/DPF aftertreatment faults, the 2.8L Duramax's exhaust gas recirculation hardware itself fails in two distinct ways. First, the EGR valve and intake tract pack with soot and oil-vapour carbon, particularly on short-trip trucks, giving rough idle, hesitation, poor economy and EGR flow codes. Second, owners report the EGR cooler developing a fissure at a weld that seeps coolant only under system pressure - the truck loses coolant slowly with no puddle on the ground, and the leak stops as soon as the engine cools and pressure drops, which makes it notoriously hard for a dealer to confirm. Diesel Colorado owners have chased unexplained coolant loss for months on this. Diesel-only; the gasoline Colorados do not use this hardware.
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View P0404 across all makes →Frequently Asked Questions
What does P0404 mean on Chevrolet?▼
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 Chevrolet specifically, this code is documented across 1 model.
What causes P0404 on Chevrolet vehicles?▼
Common causes on Chevrolet: 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 Chevrolet?▼
Repair costs on Chevrolet range from $400 to $2,200, depending on the specific model and root cause.
Which Chevrolet models have P0404 documented?▼
Au7o has documented P0404 on 1 Chevrolet model: Colorado.