P1406moderate severityPowertrain
EGR Valve Pintle Position Circuit
on 2018 GMC Acadia 2.5L I4 · AWD
What this code means
The PCM detected that the EGR valve pintle position sensor voltage is outside the expected range. The position sensor provides feedback to the PCM about the actual EGR valve opening.
Symptoms
- Check Engine Light
- Rough idle
- Poor acceleration
- Increased emissions
- Stalling
Common causes
- Faulty EGR valve position sensor
- Carbon buildup affecting valve movement
- Wiring damage to position sensor
- Corroded connector
- EGR valve mechanically binding
Diagnostic steps
- Test EGR position sensor voltage at rest and during operation
- Command EGR open/closed with scan tool and monitor position
- Inspect EGR valve for carbon buildup
- Check wiring and connector for damage
Repair notes
Clean or replace EGR valve. Check position sensor wiring.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1