P2563 on GMC: How to Diagnose & Fix
Turbocharger Boost Control Position Sensor "A" Circuit Range/Performance
1 GMC model · 1 documented issue · $250-$2,800 repair
P2563 on GMC by model: symptoms, diagnosis and fix
The Garrett variable-geometry turbocharger used on the LBZ, LMM and LML Duramax controls boost by pivoting vanes on a unison ring inside the turbine housing. Soot and carbon bake onto the ring over time and it begins to bind, so the actuator can no longer move the vanes to the commanded position. The ECM sees the mismatch and sets P003A (turbocharger position performance) and/or P2563 (turbocharger vane position sensor performance), usually together, and puts the truck in a reduced-power state. Trucks that idle a lot or run short trips soot the ring up fastest. Duramax forum and Diesel Place threads on these two codes run for hundreds of pages across 2006-2016 Sierra 2500HD trucks.
Common Symptoms
- Check engine light with reduced engine power
- Low boost / sluggish acceleration
- Surging or overboost under throttle
- Poor fuel economy
- Whistle or lack of exhaust brake function
How to Fix
Diagnose which half of the system failed before buying parts. If the vane position sensor alone is faulty it bolts to the turbo actuator and is a comparatively cheap replacement. If the vanes themselves are stuck, the turbo must come off so the unison ring, vanes and turbine housing can be cleaned and freed; badly coked units get replaced. No recall applies. Reducing extended idling and running the engine at load periodically slows re-coking.
Sources for this issue (3)
P2563 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2563 mean on a GMC?
P2563 stands for "Turbocharger Boost Control Position Sensor "A" Circuit Range/Performance." This generic powertrain code sets when the PCM/ECM detects that the signal from the turbocharger boost control position sensor (which reports the position of the variable-vane or wastegate actuator) is out of the expected range or does not respond as commanded. It indicates the module cannot confirm the turbocharger boost control mechanism is moving to the position it requested, often pointing to a vane/actuator position-sensing or boost-control fault. On GMC it is documented across 1 model: Sierra 2500HD.
What are the most common causes of P2563?
The most common causes of P2563 are: Faulty turbocharger boost control (vane) position sensor, Sticking or seized variable-vane mechanism or wastegate actuator, Failing turbocharger boost control solenoid/actuator, Wiring or connector faults (open, short, corrosion, chafing) in the sensor circuit, Carbon buildup binding the turbo vanes (common on diesels), Poor PCM/ECM ground or, rarely, a failed control module. The specific cause varies by vehicle.
How much does it cost to fix P2563 on a GMC?
Published repair estimates on GMC range from $250 to $2,800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P2563 on a different make?
View P2563 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.