P0402 on Jeep
Exhaust Gas Recirculation Flow Excessive
P0402 on Jeep vehicles indicates exhaust gas recirculation flow excessive. Au7o has documented this code across 3 Jeep models — most commonly on Commander, Gladiator, Wagoneer. P0402 means the Exhaust Gas Recirculation (EGR) system is flowing too much exhaust back into the intake. The EGR system intentionally routes a small amount of inert exhaust gas into the engine to lower combustion temperatures and reduce nitrogen-oxide emissions, but the flow must be metered precisely. When the PCM determines the flow is excessive — often because the EGR valve is stuck open or letting gas through when it shouldn't — it sets this code. Too much EGR can cause rough idle, stalling, hesitation, and a check engine light. Typical repair costs on Jeep range from $50 to $2,500, depending on the specific model and root cause.
Common Causes of P0402
- •EGR valve stuck open or not closing fully
- •Failed or sticking EGR valve diaphragm/solenoid
- •Carbon buildup holding the EGR valve open
- •Faulty EGR position or differential pressure (DPFE) sensor
- •Leaking EGR valve gasket or pintle seat
- •Vacuum control or solenoid fault commanding EGR open
- •Wiring or connector problems in the EGR control circuit
P0402 on Jeep by Model
Jeep Commander(1 issue)
- Random Electrical Failures / Dashboard Warning Lights2006-2010
The Commander is plagued by random electrical issues where dashboard warning lights illuminate and extinguish without cause, the HVAC system shuts off randomly, and various accessories behave erratically. This can occur 1-15 times per day while driving or parked. The issues are often traced to corroded ground connections, a failing TIPM (Totally Integrated Power Module), or wiring harness degradation.
Jeep Gladiator(1 issue)
- Death Wobble / Steering Shimmy2020-2025
The solid front axle design on the Gladiator is susceptible to "death wobble," a violent shaking of the front end typically triggered by hitting a bump at highway speeds. NHTSA received over 170 steering complaints for the 2020 model year alone. Contributing factors include worn ball joints, loose track bar bolts, and degraded steering stabilizer. Recall 21V-853 addressed lower ball joints on vehicles built between 9/16/2020 and 8/4/2021.
Jeep Wagoneer(1 issue)
- 5.7L eTorque Engine Stalling at Low Speeds2022-2025
The 5.7L HEMI V8 with eTorque mild-hybrid system can stall at slow speeds, causing the vehicle to unexpectedly shift into park and apply the emergency brake. NHTSA opened a formal investigation after at least 80 owner complaints. The 48V eTorque motor-generator unit and its integration with the transmission control system appear to be the root cause. Some owners report the vehicle cannot be restarted after stalling.
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View P0402 across all makes →Frequently Asked Questions
What does P0402 mean on Jeep?▼
P0402 stands for "Exhaust Gas Recirculation Flow Excessive." P0402 means the Exhaust Gas Recirculation (EGR) system is flowing too much exhaust back into the intake. The EGR system intentionally routes a small amount of inert exhaust gas into the engine to lower combustion temperatures and reduce nitrogen-oxide emissions, but the flow must be metered precisely. When the PCM determines the flow is excessive — often because the EGR valve is stuck open or letting gas through when it shouldn't — it sets this code. Too much EGR can cause rough idle, stalling, hesitation, and a check engine light. On Jeep specifically, this code is documented across 3 models.
What causes P0402 on Jeep vehicles?▼
Common causes on Jeep: EGR valve stuck open or not closing fully, Failed or sticking EGR valve diaphragm/solenoid, Carbon buildup holding the EGR valve open, Faulty EGR position or differential pressure (DPFE) sensor, Leaking EGR valve gasket or pintle seat. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0402 on a Jeep?▼
Repair costs on Jeep range from $50 to $2,500, depending on the specific model and root cause.
Which Jeep models have P0402 documented?▼
Au7o has documented P0402 on 3 Jeep models: Commander, Gladiator, Wagoneer.