P2563 — Turbocharger Boost Control Position Sensor A Circuit Range/Performance — L5P Duramax
Diagnostic reference for L5P Duramax (2017–present) P2563.
What it means
The VGT position sensor signal is outside its expected range or does not track the commanded position. On the L5P, this applies to the variable-geometry turbo with an electric actuator and position sensor; there is no wastegate.1
Most likely causes
- VGT actuator position sensor signal out of range or not tracking command — The ECM detects the VGT position sensor voltage/position is outside expected range or does not follow commanded position.1
- VGT actuator connector or wiring fault — Corrosion, pin damage, or chafed wiring at the VGT actuator/position sensor connector causes an erratic or out-of-range signal.1
- Sticking VGT vanes/unison ring causing position disagreement — Soot buildup or mechanical sticking makes actual vane position differ from commanded position, so reported position disagrees with command.1
- Actuator wear or internal position-sensor fault — Electric VGT actuator wear or internal position-sensor degradation leads to range/performance error; similar actuator/position issues are noted for related VGT codes.2
How to diagnose
- Verify code P2563 is present and check freeze-frame for engine speed, load, and temperature at set.
- Inspect VGT actuator electrical connector for corrosion, bent pins, moisture, and secure latch; inspect harness for chafing near turbo and heat damage.
- With a scan tool, view VGT commanded position vs actual position at idle and during a controlled ramp; note deviations and response lag.
- Check VGT actuator learned limits/adaptation status; if out of range, this supports a position-sensor/actuator or mechanical sticking issue.
- Inspect intake and turbo inlet for debris and check for signs of oil contamination at the actuator.
- If electrical and signal checks are inconclusive, evaluate turbocharger mechanical condition for sticking vanes/unison ring that would cause position disagreement.
- After any corrective action, perform VGT actuator relearn/calibration per OEM procedure and confirm commanded vs actual position tracks within specification.
- Clear codes and road test under varied load to confirm P2563 does not return.
Common mistake to avoid
Replacing the turbo before smoke-testing the intake. Boost leaks at intercooler boots, end tanks and clamps are a common cause of low power and underboost codes, and they mimic a failing turbo. Source: BD Diesel — 6.7L Power Stroke problems and real fixes.
Parts and tools you may need
- Scan tool with live VGT commanded/actual position data and bi-directional control
- Digital multimeter
- Inspection light and mirror
- Dielectric grease
- OEM service information for VGT relearn procedure
Tools you’ll need
- bi-directional scan tool — View and compare VGT commanded vs actual position in real time and run the VGT actuator relearn/calibration procedure.
- digital multimeter — Check the VGT actuator position sensor supply, signal, and ground voltages and verify wiring continuity to the ECM.
- inspection mirror and LED flashlight — Visually inspect the VGT actuator connector, harness routing near the turbo, and signs of heat damage or oil contamination without removing components.
Rough cost and difficulty
| Likely repair | Parts | Shop labor | Who usually does it |
|---|---|---|---|
| Wiring or connector repair | $10–$100 | 1–4 hrs | DIY with tools and a manual |
| VGT actuator / vane control solenoid | $100–$400 | 0.5–2 hrs | DIY with tools and a manual |
Typical US independent-shop figures; labor runs about $120–$180 per hour (dealers charge more). Confirm the diagnosis before buying parts.
When to see a pro
If diagnosis points to internal turbocharger mechanical issues or requires VGT relearn with bi-directional controls, have a qualified diesel technician perform inspection and service. Do not attempt high-pressure fuel or turbocharger disassembly without proper training and safety equipment.
Check for recalls
Recalls are tied to your truck’s VIN, so check yours directly: enter the VIN at NHTSA’s recall lookup. Open safety recalls are repaired free at a dealer.
Sources
Repair videos: P2563 on the L5P Duramax
Third-party videos, not ours — picked for this engine. Confirm anything against the factory service information for your truck.
Spotted an error, or something missing? Tell us
Run a L5P Duramax? This goes straight to the editor — it is not published.