What are the common causes of P046C?

A failed EGR sensor A. An erratic sensor A signal. Corrosion at the sensor A connector. A restricted EGR passage skewing the signal. An ECM fault on the sensor A circuit.

Compare the sensor A reading against the commanded EGR position. Inspect the sensor A connector for corrosion. Check the EGR passages for a restriction. Verify the sensor A is the correct part. Replace sensor A if the reading stays off. Clear the code and retest.

P046C

EGR Sensor A Circuit Range/Performance

System: Auxiliary emission controls (P code)
Lamp: Check Engine Light
Category: Powertrain - Auxiliary Emissions Controls

What it means

P046C means EGR Sensor A Circuit Range/Performance.

Where it lives

For P046C, start at the sensor the description names.

Check these first

A failed EGR sensor A
An erratic sensor A signal
Corrosion at the sensor A connector
A restricted EGR passage skewing the signal
An ECM fault on the sensor A circuit

What to do next

Compare the sensor A reading against the commanded EGR position
Inspect the sensor A connector for corrosion
Check the EGR passages for a restriction
Verify the sensor A is the correct part
Replace sensor A if the reading stays off
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.