Boost Deviation and Safety Limiters

🧠 Part of the TuningBot ECU Knowledge Base — in-depth documentation on ECU logic, maps, emissions systems and safe calibration methods.

Boost deviation monitoring protects the engine when actual boost doesn’t match target.

Deviation Types

  • Underboost — actual below target (leak, VGT fault)
  • Overboost — actual above target (wastegate stuck)

Common DTCs

  • P0234 — Overboost
  • P0299 — Underboost

Calibration Notes

Adjust deviation thresholds when raising boost targets. Verify turbo can achieve new targets.

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