2012 GMC Sierra
Mileage
87,980
Service Date
9/2/2026
Services Performed
- Check engine light off at this time. Found three codes stored in PCM as follows: P0106 (Manifold Absolute Pressure sensor performance) 3 fail 125 pass since check engine light first came on. Last failure was at key on engine off with a warm engine. P2263 (Turbocharger boost system performance) 1 fail 23 pass since code first set. Set with warm engine at 40mph cruise. P0299 (Turbocharger underboost condition) 1 fail 9 pass since code first set. Set with warm engine and 66% load. Perform wiggle and tap test on MAP sensor looking for change in voltage and found no change. Inspect MAP sensor connector and wires – OK at this time. Test drive vehicle to attempt to duplicate customer concern. Turbocharger produces 36 PSI of boost at WOT and MAP sensor reading agrees with PCM's desired boost pressure at all various driving conditions. PCM determines actual boost pressure with the MAP sensor so if the reading drops out or is unreliable, it can cause all three of the codes that are set. Will need to duplicate customer concern for a definite diagnosis, but suspect that the MAP sensor is intermittently failing.
- LOF
JIM S. gave our service a 5 star review on 9/3/2026
