EGR Valve Pintle Position Circuit
Table of contents
P1406 ISUZU Possible Causes
- Faulty Exhaust Gas Recirculation (EGR) valve
- Carbon blockage of the pintle
How do I fix code P1406 ISUZU?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1406 ISUZU code
The cost of diagnosing the P1406 ISUZU code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected
The EGR pintle position was ±10% of the expected position.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1406 ISUZU Description
The Powertrain Control Module (PCM) determines that the EGR valve is stuck open if the actual Exhaust Gas Recirculation (EGR) position and the learned closed EGR position vary by more than a predetermined value. The PCM tests for a stuck valve when the desired EGR position is at 0%. The PCM commands the EGR valve to 100% during certain driving conditions in order to clear a possible restriction from the EGR valve if the PCM determines that the valve is stuck open.