AutoCodes – GMC – P1405 GMC

P1405 GMC Code - Exhaust Gas Recirculation System Valve 3

Quick Answer

With the Engine Coolant Temperature (ECT) over 183°F, gear selector in 1st or 2nd gear, vehicle in coast-down mode, HO2S-11 signal over 566 mv, VSS over 20 mph, A/C Clutch on, engine speed at 1000-1488 rpm, then the Powertrain Control Module (PCM) detected that engine rpm did not drop 4 out of 5 times in the test Common causes include Faulty EGR Solenoid Valve, EGR Solenoid Valve harness is open or shorted, EGR Solenoid Valve circuit poor electrical connection. 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: P1405 GMC indicates Exhaust Gas Recirculation System Valve 3.
Common causes: Common causes include Faulty EGR Solenoid Valve, EGR Solenoid Valve harness is open or shorted, EGR Solenoid Valve circuit poor electrical connection.
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.

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Code Popularity 7,615

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1405 GMC Description

OBDII Code P1405 GMC - Exhaust Gas Recirculation System Valve 3 - AutoCodes.com — P1405 GMC Code - Exhaust Gas Recirculation System Valve 3

What does this mean?

What are the Possible Causes of the DTC P1405 GMC?

Faulty EGR Solenoid Valve
EGR Solenoid Valve harness is open or shorted
EGR Solenoid Valve circuit poor electrical connection

How to Fix the DTC P1405 GMC?

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 P1405 GMC 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.

Need more information about the P1405 GMC code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.