P0403
Medium SeverityEGR Control Circuit
Emissions System
P0403 — Instant Answer
EGR Control Circuit
Severity: MEDIUM SEVERITY
Meaning: The EGR valve control solenoid or motor has a circuit fault.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $30 - $200
Most common causes:
- 1. Failed EGR solenoid (35-45% of cases)
- 2. Wiring issue (10-25% of cases)
- 3. Failed EGR valve motor (10-25% of cases)
Symptoms
- ⚠️Check engine light
- ⚠️EGR not functioning
- ⚠️Possible rough idle
Related Symptoms
Common Causes
How to Diagnose P0403
- 1Check EGR connector
- 2Test solenoid/motor
- 3Check wiring
OEM Procedures for P0403
P0403 affects the EGR Valve. Found 8 OEM service manual procedures.
Adjustment/Replacement - Specification
Adjustment/Replacement - Specification
Adjustment/Replacement - Specification
Adjustment/Replacement - Specification
Adjustment/Replacement - Specification
Adjustment/Replacement - Specification
Adjustment/Replacement - Specification
Adjustment/Replacement - Specification
OEM Diagnostic Flowchart
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TopScan
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ArtiLink600
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Parts & Tools for This Job
Common parts shoppers buy for P0403 EGR Control Circuit.
Oxygen Sensor
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Catalytic Converter
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EVAP Purge Valve
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Gas Cap
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OBD2 scanner
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Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsReady to fix it yourself?
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0403.
OEM Manual Evidence
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Related Symptoms
Browse →A check-engine light is a graph entry point into code pages, symptom-specific diagnosis, and the exact repair categories most often associated with those failures.
Rough idle often traces back to ignition, air metering, vacuum leaks, or timing-related faults before it becomes a full misfire complaint.
Exact Vehicle Hubs
Browse →Open the exact vehicle hub for a repair workflow commonly associated with P0403.
Open the exact vehicle hub for a repair workflow commonly associated with P0403.
Open the exact vehicle hub for a repair workflow commonly associated with P0403.
Open the exact vehicle hub grounded by OEM manual evidence related to P0403.
Open the exact vehicle hub grounded by OEM manual evidence related to P0403.
Open the exact vehicle hub grounded by OEM manual evidence related to P0403.
Exact Repair Workflows
Browse →Open the exact repair flow most commonly associated with P0403 on this vehicle.
Open the exact repair flow most commonly associated with P0403 on this vehicle.
Open the exact repair flow most commonly associated with P0403 on this vehicle.
Open the exact repair flow most commonly associated with P0403 on this vehicle.
Open the exact repair flow most commonly associated with P0403 on this vehicle.
Open the exact repair flow most commonly associated with P0403 on this vehicle.
Related Codes
The EGR system flow is not within expected parameters.
The EGR is not flowing enough exhaust gas. Usually carbon buildup blocking the passages.
Too much exhaust gas is being recirculated, causing rough idle and stalling.
Frequently Asked Questions
- Is the EGR solenoid part of the valve?
- On modern vehicles, the solenoid is usually integrated into the EGR valve assembly.
- How much is an EGR valve?
- EGR valves cost $30-$200 depending on the vehicle. Electronic EGR valves cost more than vacuum-operated ones.
Find your service manual
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-11-07