P0403 on RAM
Exhaust Gas Recirculation Circuit Malfunction
P0403 on RAM vehicles indicates exhaust gas recirculation circuit malfunction. Au7o has documented this code across 2 RAM models — most commonly on 1500, ProMaster. 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 RAM range from $40 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 RAM by Model
RAM 1500(1 issue)
- Dashboard Cracking and Warping2019-2024
The 2019-2024 RAM 1500 dashboard develops cracks, warping, and deformation, particularly in hot climates. Cracks commonly appear near the defroster vents, along the passenger side airbag seam, and around the center console area. The issue is attributed to UV exposure and thermal cycling degrading the dashboard material. Vehicles parked outdoors in southern states (AZ, TX, NV, FL) are most affected. While primarily cosmetic, cracks near the passenger airbag seam could theoretically affect airbag deployment. Dashboard replacement costs $1,500-2,500+ at the dealer.
RAM ProMaster(1 issue)
- 3.6L Pentastar V6 Oil Filter Housing/Cooler Leak2014-2025
The RAM ProMaster with the 3.6L Pentastar V6 engine suffers from a well-known oil filter housing/cooler leak. The oil filter housing is mounted to the side of the engine block and contains an integrated oil cooler. The gaskets and O-rings that seal the housing deteriorate over time, causing oil to leak externally (visible drip on the ground) and/or internally (oil mixing with coolant). If oil enters the cooling system, it destroys the coolant and can cause overheating. The leak typically appears between 40,000-80,000 miles. This is the same issue that affects all Pentastar 3.6L vehicles (Jeep, Dodge, Chrysler). Mopar updated the housing design (68105583AF) with improved seals.
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View P0403 across all makes →Frequently Asked Questions
What does P0403 mean on RAM?▼
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 RAM specifically, this code is documented across 2 models.
What causes P0403 on RAM vehicles?▼
Common causes on RAM: 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 RAM?▼
Repair costs on RAM range from $40 to $2,500, depending on the specific model and root cause.
Which RAM models have P0403 documented?▼
Au7o has documented P0403 on 2 RAM models: 1500, ProMaster.