The Lemon IndexThe EGR position sensor reads too high.
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
Failed EGR valve/sensor. Then: wiring fault.
Owners named P0406 in 9 complaints to the U.S. government, most often on the Ram pickup.
Cars owners report it on
Complaints that name P0406, by model. Raw counts, not a failure rate: popular models get more complaints.
Years owners report it on most: 2005 Ram pickup
The details
What P0406 means
The EGR position sensor reads too high.
Can I drive with P0406?
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
33% of the owner complaints that name P0406 also say the car stalls or shuts off. A complaint can describe more than one problem, so this doesn't prove the code caused it.
Common causes of P0406
- Failed EGR valve/sensor
- Wiring fault
A shop should confirm the cause with a scan and tests before replacing parts.
What owners describe
- Stalls or shuts off: 33% of complaints
- Loses power or goes into limp mode: 33% of complaints
Share of complaints naming the code whose text also mentions each problem.
Model years that report P0406 most
2005 Ram pickup (3).
Related codes
P0405 P0404 P0403 P0402 P0401 P0410 P0411 P0418
Quick answers
What does P0406 mean?
Exhaust Gas Recirculation Sensor A Circuit High. The EGR position sensor reads too high.
Can I drive with P0406?
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
What causes P0406?
Failed EGR valve/sensor; Wiring fault.
Counts: NHTSA owner complaints whose text names P0406. A complaint is an owner's report, not a diagnosis. Meanings: the standard SAE J2012 definitions in our own words; manufacturer codes only where verified for that make. General information, not repair advice for your car.