Diesel Trouble Codes

P0045 — Turbocharger Boost Control Solenoid A Circuit/Open (6.7 Cummins (EGR + DPF, pre-SCR))

P0045 is a generic OBD-II code for an electrical fault in the turbocharger boost control solenoid A circuit. On the 2007.5–2012 6.7L Cummins (EGR+DPF, pre-SCR)…

Updated September 2, 2026

What it means

On this platform the code does not indicate a boost-control solenoid because the 2007.5–2012 6.7L Cummins has no boost-control solenoid, no wastegate, and no vacuum lines; boost is controlled by the VGT’s electric actuator with integrated position sensor. P0045 here is interpreted as an electrical fault in the VGT actuator control circuit. Typical related codes are P2262, P226C, P0234, P0299.12345

Most likely causes

  1. VGT actuator electrical fault / open or short in actuator harness or connector — Inspect the HE351VE VGT actuator connector and wiring for corrosion, oil intrusion, chafing, or loose pins. Check actuator power/ground and signal circuits for opens/shorts to ground or battery per wiring diagram. Compare freeze-frame for circuit fault vs performance fault.123
  2. VGT actuator internal failure (position sensor or motor) — The electric actuator contains an integrated position sensor. Internal wear, carbon buildup, or sensor drift can set circuit/performance codes. Actuator learn/adaptation may be out of range, often clustering with P226C.23
  3. ECM driver or related wiring issue — An open/short in the ECM-to-actuator wiring or an ECM output driver fault can set P0045. Verify continuity and isolation of the control circuit and inspect ECM connectors for moisture/corrosion.12
  4. Recent repair / connector left disconnected or damaged — After turbo/actuator service, a disconnected or damaged actuator connector will set a circuit/open fault immediately.12

How to diagnose

  1. Verify platform applicability: confirm 2007.5–2012 6.7L Cummins with HE351VE VGT electric actuator, no boost solenoid/vacuum. If a different turbo control strategy is present, code meaning differs.
  2. Scan for related codes: P2262, P226C, P0234, P0299 often accompany VGT actuator issues on this platform.
  3. Review freeze-frame data to identify conditions at set (engine speed, load, boost, actuator commanded vs actual).
  4. Inspect VGT actuator connector and harness for oil, corrosion, chafing, and proper seating. Check for moisture in ECM connectors.
  5. Perform electrical tests at the actuator connector: reference voltage, ground, and command signal integrity per service information; look for opens/shorts.
  6. Command VGT actuator through bi-directional control (if available) and monitor actual vs desired position with a scan tool; note limited travel or non-response.
  7. Check for technical service bulletins / software updates related to VGT learn/adaptation and ECM calibration.
  8. If electrical tests pass but position error persists, evaluate actuator mechanical binding/carbon buildup and consider actuator relearn procedure per manufacturer guidance.
  9. Clear codes, road test under load, and confirm no recurrence of P0045 and related VGT codes.

Parts and tools you may need

Rough cost and difficulty

Electrical diagnosis is labor-intensive; actuator replacement cost varies by part source and labor. Always confirm root cause electrically before replacing the VGT actuator or turbo assembly.

When to see a pro

If wiring tests are inconclusive, ECM driver suspicion exists, or repeated actuator failures occur, have a qualified diesel technician perform pinpoint electrical tests and, if needed, ECM evaluation. Do not attempt high-pressure fuel system service without proper training and safety equipment.

Sources

  1. Curated DTC seed — 6.7 Cummins (EGR + DPF, pre-SCR) (curated) ↩︎ ↩︎ ↩︎ ↩︎

  2. Curated DTC seed — 6.7 Cummins (EGR + DPF, pre-SCR) (curated) ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

  3. Curated DTC seed — 6.7 Cummins (EGR + DPF, pre-SCR) (curated) ↩︎ ↩︎ ↩︎

  4. Curated DTC seed — 6.7 Cummins (EGR + DPF, pre-SCR) (curated) ↩︎

  5. Curated DTC seed — 6.7 Cummins (EGR + DPF, pre-SCR) (curated) ↩︎