What does the p0406 OBD-II trouble code mean?
What does the p0406 OBD-II trouble code mean? What the P0406 code means. P0406 means that the exhaust gas recirculation (EGR) sensor A has high circuit voltage. What causes a p0406 circuit to short out? Potential causes of a P0406 code include: EGR sensor signal circuit shorted to B+ (battery voltage) EGR sensor signal circuit shorted to the 5 volt reference circuit to EGR. EGR sensor ground circuit open. What should the p0406 EGR sensor reading be? There is a feedback sensor on most EGR valves that informs the computer of the actual EGR position. This sensor usually ranges between...