P0403 on Jeep
Exhaust Gas Recirculation Circuit Malfunction
P0403 on Jeep vehicles indicates exhaust gas recirculation circuit malfunction. Au7o has documented this code across 3 Jeep models — most commonly on Commander, Gladiator, Wagoneer. This emissions code indicates a malfunction in the exhaust gas recirculation (EGR) control circuit. The EGR system routes a small amount of exhaust back into the intake to lower combustion temperatures and reduce nitrogen-oxide emissions, and the computer commands the EGR valve open and closed through this circuit. The code sets when the electrical control signal to the EGR valve or its solenoid is out of the expected range — for example, an open, short, or a commanded change that doesn't produce the right feedback. It generally points to an electrical or wiring problem in the EGR control circuit, or the EGR valve/solenoid itself, rather than carbon clogging alone. Typical repair costs on Jeep range from $50 to $2,500, depending on the specific model and root cause.
Common Causes of P0403
- •Faulty EGR valve or EGR solenoid
- •Damaged wiring or connector in the EGR control circuit
- •Open or short in the EGR control wiring
- •Corroded or loose EGR connector
- •Blown fuse or lost power supply to the EGR circuit
- •Carbon buildup binding the EGR valve
- •Faulty engine control module or driver circuit
P0403 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 P0403 across all makes →Frequently Asked Questions
What does P0403 mean on Jeep?▼
P0403 stands for "Exhaust Gas Recirculation Circuit Malfunction." This emissions code indicates a malfunction in the exhaust gas recirculation (EGR) control circuit. The EGR system routes a small amount of exhaust back into the intake to lower combustion temperatures and reduce nitrogen-oxide emissions, and the computer commands the EGR valve open and closed through this circuit. The code sets when the electrical control signal to the EGR valve or its solenoid is out of the expected range — for example, an open, short, or a commanded change that doesn't produce the right feedback. It generally points to an electrical or wiring problem in the EGR control circuit, or the EGR valve/solenoid itself, rather than carbon clogging alone. On Jeep specifically, this code is documented across 3 models.
What causes P0403 on Jeep vehicles?▼
Common causes on Jeep: Faulty EGR valve or EGR solenoid, Damaged wiring or connector in the EGR control circuit, Open or short in the EGR control wiring, Corroded or loose EGR connector, Blown fuse or lost power supply to the EGR circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0403 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 P0403 documented?▼
Au7o has documented P0403 on 3 Jeep models: Commander, Gladiator, Wagoneer.