P0400 on Chrysler: How to Diagnose & Fix
Exhaust Gas Recirculation (EGR) Flow Malfunction
1 Chrysler model · 1 documented issue · $150-$400 repair
P0400 on Chrysler by model: symptoms, diagnosis and fix
The EGR (Exhaust Gas Recirculation) valve on the 2.4L engine clogs with carbon deposits and sticks open or closed. When stuck open, it causes rough idle, stalling, and hesitation. When stuck closed, it increases NOx emissions and may trigger a check engine light. The EGR passages in the intake manifold also clog with carbon, reducing effectiveness even with a functioning valve. The turbo model is especially prone due to higher exhaust temperatures.
Common Symptoms
- Rough idle or stalling at idle
- Check engine light with EGR flow codes
- Hesitation during acceleration
- Failed emissions test for high NOx
- Engine surging or hunting at idle
How to Fix
Remove the EGR valve and clean it with carburetor cleaner and a wire brush. Clean the EGR passages in the intake manifold with a long bristle brush. If the valve diaphragm is torn or the pintle is worn, replace the EGR valve (Standard Motor Products EGV880 or equivalent). Also clean the EGR tube connecting the exhaust manifold to the valve. Budget $150-$400 for cleaning and/or replacement.
Sources for this issue (1)
P0400 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 P0400 mean on a Chrysler?
P0400 stands for "Exhaust Gas Recirculation (EGR) Flow Malfunction." P0400 is a generic powertrain code indicating the engine computer detected a problem with exhaust gas recirculation (EGR) flow — either too much, too little, or incorrect flow compared to what was commanded. The EGR system routes a small amount of exhaust back into the intake to lower combustion temperatures and reduce emissions. A fault can cause rough idle, pinging/knock, increased emissions, and failed emissions testing, though it is generally not an immediate driving hazard. On Chrysler it is documented across 1 model: PT Cruiser.
What are the most common causes of P0400?
The most common causes of P0400 are: Clogged or carbon-blocked EGR passages, Faulty EGR valve (stuck open or closed), Faulty EGR position or DPFE/flow sensor, Vacuum or electrical control fault to the EGR valve, Blocked or cracked EGR tube, Wiring/connector issues, PCM fault (rare). The specific cause varies by vehicle.
How much does it cost to fix P0400 on a Chrysler?
Published repair estimates on Chrysler range from $150 to $400 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0400 on a different make?
View P0400 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.