P1408 Code - EGR Flow Out Of Self Test Range
Quick Answer
The Exhaust Gas Recirculation (EGR) system recirculates a portion of the exhaust gasses into the intake manifold under average vehicle driving conditions to reduce combustion temperatures and exhaust gas NOx content. Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation (EGR) Valve Vacuum hose off or defective, Plugged Exhaust Gas Recirculation (EGR) Valve. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P1408 indicates EGR Flow Out Of Self Test Range.
- Common causes
- Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation (EGR) Valve Vacuum hose off or defective, Plugged Exhaust Gas Recirculation (EGR) Valve.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P1408 Description
This test is performed during the Key On Engine Running (KOER) on demand self-test only. The EGR system is commanded ON at a fixed engine speed. The test fails and the Diagnostic Trouble Code (DTC) is output when the measured EGR flow falls above or below the required calibration.
What are the Possible Causes of the DTC P1408?
- Faulty Exhaust Gas Recirculation (EGR) Valve
- Exhaust Gas Recirculation (EGR) Valve Vacuum hose off or defective
- Plugged Exhaust Gas Recirculation (EGR) Valve
How to Fix the DTC P1408?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1408 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P1408 Audi — EGR Temperature Sensor Signal Too High
- P1408 BMW — Tank Fill Level Left Signal
- P1408 Buick — Intake Manifold Pressure Sensor Circuit
- P1408 Cadillac — Intake Manifold Pressure Sensor Circuit
- P1408 Chevrolet — Intake Manifold Pressure Sensor Circuit
- P1408 Ford — EGR Flow Out Of Self-Test Range
- P1408 GMC — Intake Manifold Pressure Sensor Circuit
- P1408 Jaguar — EGR Flow Out Of Self Test Range
- P1408 Lincoln — EGR Flow Out Of Self-Test Range
- P1408 Mazda — EGR Out Of Self Test Range
- P1408 Mercury — EGR Flow Out Of Self-Test Range
- P1408 Suzuki — Manifold Differential Pressure Sensor Circuit Malfunction
- P1408 Volkswagen — EGR Temperature Sensor Signal Too High
Frequently Asked Questions about P1408 Code
No Frequently Asked Questions about P1408 Code found.
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