The Lemon IndexThe EGR valve control circuit has an electrical fault.
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. Then: wiring fault.
Owners named P0403 in 8 complaints to the U.S. government, most often on the Chevrolet Volt.
Cars owners report it on
Complaints that name P0403, by model. Raw counts, not a failure rate: popular models get more complaints.
Years owners report it on most: 2017 Chevrolet Volt
The details
What P0403 means
The EGR valve control circuit has an electrical fault.
Can I drive with P0403?
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
38% of the owner complaints that name P0403 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 P0403
- Failed EGR valve
- Wiring fault
A shop should confirm the cause with a scan and tests before replacing parts.
What owners describe
- Stalls or shuts off: 38% of complaints
- Loses power or goes into limp mode: 25% of complaints
- Warning lights and electrical faults: 25% of complaints
Share of complaints naming the code whose text also mentions each problem.
Model years that report P0403 most
2017 Chevrolet Volt (3).
Related codes
P0402 P0404 P0401 P0405 P0406 P0410 P0411 P0418
Quick answers
What does P0403 mean?
Exhaust Gas Recirculation A Control Circuit. The EGR valve control circuit has an electrical fault.
Can I drive with P0403?
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 P0403?
Failed EGR valve; Wiring fault.
Counts: NHTSA owner complaints whose text names P0403. 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.