P0400 on Chrysler
Exhaust Gas Recirculation (EGR) Flow Malfunction
P0400 on Chrysler vehicles indicates exhaust gas recirculation (egr) flow malfunction. Au7o has documented this code across 1 Chrysler model — most commonly on PT Cruiser. 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. Typical repair costs on Chrysler range from $150 to $400, depending on the specific model and root cause.
Common Causes of P0400
- •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)
P0400 on Chrysler by Model
Chrysler PT Cruiser(1 issue)
- EGR Valve Failure and Carbon Buildup2001-2010
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.
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View P0400 across all makes →Frequently Asked Questions
What does P0400 mean on 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 specifically, this code is documented across 1 model.
What causes P0400 on Chrysler vehicles?▼
Common causes on Chrysler: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0400 on a Chrysler?▼
Repair costs on Chrysler range from $150 to $400, depending on the specific model and root cause.
Which Chrysler models have P0400 documented?▼
Au7o has documented P0400 on 1 Chrysler model: PT Cruiser.