A couple of months ago, my 3500 6.5 Chevy diesel started throwing the P0238 code (Turbocharger Boost Sensor Circuit High Voltage). I replaced the sensor & solved the problem.

Then it started throwing P0236 (Turbocharger Boost Sensor A Circuit Range/Performance) & running like crap, so I replaced the wastegate solenoid. The truck runs fantastic.

Now, last night I brought it up to 70 mph and it threw BOTH codes again! It still runs good, but I can't figure out why it is throwing these codes again. Any ideas? I don't know what else to do. Thanks...