The Lemon IndexToo much exhaust gas is going back into the engine, which can cause a rough idle or stalling.
Get it fixed soon. A few more days of normal driving is usually OK, but waiting can turn a small repair into a bigger one or a breakdown.
EGR valve stuck open. Then: faulty EGR control.
Owners named P0402 in 11 complaints to the U.S. government, most often on the Ram pickup.
Cars owners report it on
Complaints that name P0402, by model. Raw counts, not a failure rate: popular models get more complaints.
Years owners report it on most: 2017 Ram pickup
The details
What P0402 means
Too much exhaust gas is going back into the engine, which can cause a rough idle or stalling.
Can I drive with P0402?
Get it fixed soon. A few more days of normal driving is usually OK, but waiting can turn a small repair into a bigger one or a breakdown.
27% of the owner complaints that name P0402 also say the car loses power or goes into limp mode. A complaint can describe more than one problem, so this doesn't prove the code caused it.
Common causes of P0402
- EGR valve stuck open
- Faulty EGR control
A shop should confirm the cause with a scan and tests before replacing parts.
What owners describe
- Loses power or goes into limp mode: 27% of complaints
Share of complaints naming the code whose text also mentions each problem.
Model years that report P0402 most
2017 Ram pickup (2).
Related codes
P0401 P0403 P0404 P0405 P0406 P0410 P0411 P0418
Quick answers
What does P0402 mean?
Exhaust Gas Recirculation A Flow Excessive Detected. Too much exhaust gas is going back into the engine, which can cause a rough idle or stalling.
Can I drive with P0402?
Get it fixed soon. A few more days of normal driving is usually OK, but waiting can turn a small repair into a bigger one or a breakdown.
What causes P0402?
EGR valve stuck open; Faulty EGR control.
Counts: NHTSA owner complaints whose text names P0402. 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.