Diesel Trouble Codes

P2262 — Turbocharger Boost Pressure Not Detected (6.7 Cummins (SCR / DEF))

Diagnostic reference for 6.7 Cummins SCR/DEF 2013–present. Turbo is Holset HE300VG VGT with electric actuator + integrated position sensor; no…

Updated September 2, 2026

What it means

Engine control module detects turbocharger boost pressure lower than expected or not detected. On this platform the VGT uses an electric actuator with integrated position sensor and MAP-based load control; no wastegate/vacuum/boost solenoid.12

Most likely causes

  1. VGT electric actuator / position sensor fault or learned travel out of range — Actuator or integrated position sensor malfunction, wiring/connector corrosion, or learned travel exceeded. Platform uses HE300VG VGT with electric actuator + position sensor; no wastegate/vacuum/boost solenoid. Related codes include P226C for position learning limit.13
  2. Boost leak or intake restriction — Post-turbo boost leak, cracked intercooler piping, loose clamps, damaged intercooler, or restricted air filter/intake. MAP-based load control expects boost to match commanded VGT position.2
  3. Exhaust restriction / turbine side blockage — Clogged DPF/SCR, collapsed exhaust, or turbine housing fouling reduces turbine drive and boost. Emissions system includes DOC/DPF and SCR/DEF on this platform.2
  4. MAP sensor or circuit issue — Faulty manifold absolute pressure sensor or wiring causing incorrect boost reporting. Air metering is MAP-based; MAF is for EGR/emissions, not primary fueling.2
  5. VGT vane sticking / carbon buildup — VGT vanes stick due to soot/carbon, causing inability to build commanded boost. Typical on HE300VG VGT with electric actuator.13

How to diagnose

  1. Verify freeze frame and confirm P2262 with no accompanying overboost/underboost codes. Check for related VGT codes P226C, P0045, P0299, P0234.
  2. Inspect intake and boost plumbing for leaks, loose clamps, cracked pipes, damaged intercooler. Pressure-test boost circuit if available.
  3. Inspect air filter and intake restriction; check grid heater operation for intake restriction on cold start. Platform has intake-air grid heater, no glow plugs.
  4. Check exhaust backpressure and DPF/SCR condition; excessive restriction reduces turbine drive. Emissions system includes DOC/DPF and SCR/DEF.
  5. Inspect VGT actuator connector and wiring for corrosion/damage; check actuator power/ground and CAN signals per service info. Turbo is HE300VG VGT with electric actuator + integrated position sensor; no wastegate/vacuum/boost solenoid.
  6. Command VGT actuator through scan tool and observe actual vs desired position; check learned travel limits. P226C indicates position exceeded learning limit.
  7. Test MAP sensor voltage and compare to actual boost with mechanical gauge; verify sensor and reference circuits. Air metering is MAP-based.
  8. Inspect turbocharger for shaft play, oil contamination, and vane movement; look for carbon buildup causing vane sticking.

Parts and tools you may need

Rough cost and difficulty

Parts and labor vary by model year and root cause. VGT actuator replacement, turbo service, or intake/exhaust repairs can be costly; diagnosis should confirm cause before parts replacement.

When to see a pro

If bi-directional VGT control is unavailable, if turbocharger disassembly is required, or if exhaust/DPF/SCR service is needed. High-pressure fuel system work is safety-critical; do not service high-pressure fuel lines. Seek a qualified diesel technician.

Sources

  1. Curated DTC seed — 6.7 Cummins (SCR / DEF) (curated) ↩︎ ↩︎ ↩︎

  2. Curated DTC seed — 6.7 Cummins (SCR / DEF) (curated) ↩︎ ↩︎ ↩︎ ↩︎

  3. Curated DTC seed — 6.7 Cummins (SCR / DEF) (curated) ↩︎ ↩︎