Diesel Trouble Codes

P1247 — Turbocharger Boost Control Valve Circuit Range/Performance (7.3 Power Stroke)

Diagnostic reference for 7.3L Power Stroke 1999-2003. Code P1247 is a VGT/boost-control code that does not apply to this platform.

Updated September 2, 2026

What it means

P1247 means the ECM detected the turbocharger boost control valve circuit outside expected range/performance. On the 7.3L Power Stroke 1999-2003 the turbo is a fixed-geometry Garrett with no VGT/vanes and no boost-control valve/solenoid, so P1247 is a VGT/boost-control code that does not apply to this platform.1

Most likely causes

  1. Code set due to mismatched PCM calibration / aftermarket tuning referencing a VGT boost control circuit that does not exist on this hardware — The 7.3L Power Stroke uses a fixed-geometry Garrett turbo with no VGT/vanes and no boost-control valve/solenoid. P1247 is a VGT/boost-control code that does not apply to this platform.1
  2. Generic OBD-II code misinterpretation; no turbo boost control hardware present — Typical on this platform: 7.3L Power Stroke (1999-2003 Super Duty/Excursion) has a fixed-geometry Garrett turbo with no VGT/vanes and no boost-control valve/solenoid. P1247 is a VGT/boost-control code that does not apply to this platform.1

How to diagnose

  1. Verify platform and hardware: confirm 7.3L Power Stroke 1999-2003 with fixed-geometry Garrett turbo and no VGT/boost control valve.
  2. Check PCM calibration / tuning history for non-native codes; confirm code is present and not a scanner misread.
  3. Inspect for wiring faults or previous modifications that could cause spurious codes; the platform has no boost control valve circuit to test.

Parts and tools you may need

Rough cost and difficulty

No repair required for P1247 on this platform; address PCM calibration or scanner interpretation instead.

When to see a pro

If code persists after confirming stock calibration, have a Ford diesel specialist verify PCM strategy and rule out aftermarket tuning artifacts. Do not attempt turbocharger disassembly for boost control components that do not exist on this engine.

Sources

  1. Curated DTC seed — 7.3 Power Stroke (curated) ↩︎ ↩︎ ↩︎