What does P1406 mean on a Chevy?

P1406. EGR Valve Pintle Position Circuit. Applies to Silverado, Sierra, Tahoe, Yukon, Suburban, Impala.

What causes P1406 on a Chevy?

Carbon buildup jamming the EGR valve pintle open or closed Failed EGR valve position sensor on 4.8L, 5.3L and 6.0L Vortec engines Corroded EGR valve connector from heat cycling near the intake manifold Open or shorted 5-volt reference wire to the EGR pintle position sensor

How do I fix P1406 on a Chevy?

Command the EGR valve open and closed with a Tech2/GDS2 scan tool and watch pintle position response Remove the EGR valve and inspect for carbon packing before ordering a replacement Back-probe the pintle position signal wire and verify smooth voltage sweep, not just code reading Repair wiring and connector first; replace the valve only if the pintle sticks when actuated by hand

Code

P1406

EGR Valve Pintle Position Circuit

Category: Powertrain - Auxiliary Emissions Controls
Severity: Check Engine Light
Applies to: Silverado, Sierra, Tahoe, Yukon, Suburban, Impala
Related: No single generic twin. See OBD Codes List

What it means

P1406. EGR Valve Pintle Position Circuit. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon, Suburban, Impala.

Findings, check these first

Carbon buildup jamming the EGR valve pintle open or closed
Failed EGR valve position sensor on 4.8L, 5.3L and 6.0L Vortec engines
Corroded EGR valve connector from heat cycling near the intake manifold
Open or shorted 5-volt reference wire to the EGR pintle position sensor

Standard procedure

Command the EGR valve open and closed with a Tech2/GDS2 scan tool and watch pintle position response
Remove the EGR valve and inspect for carbon packing before ordering a replacement
Back-probe the pintle position signal wire and verify smooth voltage sweep, not just code reading
Repair wiring and connector first; replace the valve only if the pintle sticks when actuated by hand

Look up another code

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Sources and review

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Last updated 2026-09-13.

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