Code
P0293
GWM
P — Powertrain
- 11 cylinder is incorrectly balanced
Views:
UK: 3
EN: 5
RU: 3
AI status
Completed
Completed
100%
Causes
- Leak or restriction in intake/charge air system (hoses, intercooler, clamps)
- Wastegate or bypass valve stuck open or not actuating
- Turbocharger mechanical failure (worn seal, damaged turbine, shaft play)
- Faulty boost/pressure sensor or wiring (MAP/boost sensor)
- Vacuum/pressure supply fault to actuator or boost control solenoid
- Exhaust restriction (blocked catalytic converter or DPF)
Symptoms
- Check Engine Light (MIL) on
- Noticeable loss of power and poor acceleration, especially under load
- Delayed or no turbo spool-up (turbo lag)
- Black/sooty exhaust smoke under acceleration
- Engine enters limp or reduced-power mode
- Higher than normal engine RPMs for requested acceleration
What to check
- Read and record freeze-frame data and stored/related codes
- Monitor live data: commanded boost vs actual boost (kPa/bar/psi) during part-throttle and wide-open throttle
- Check boost pressure sensor voltage/reading and compare to scanner values
- Visual inspection of all intake/intercooler hoses, clamps, and connections for cracks or looseness
- Pressure-test intake/charge air system (boost leak test) at specified pressure
- Inspect wastegate and bypass valve operation (actuator movement, linking, and solenoid control)
Signal parameters
- Commanded boost pressure: manufacturer-specific (example range 0.2–1.8 bar) — should match actual within tolerance
- Actual boost pressure: follows commanded; drop below commanded = underboost fault
- Boost/MAP sensor voltage: ~0.5–4.5 V (varies with load) — compare to expected curve
- Wastegate control duty cycle/command: 0–100% — verify ECU commands and actuator response
- Turbo speed or RPM (if available): increases with load; lack of rise indicates problem
- Intake air temperature/MAF readings: abnormal values can affect boost control
Diagnostic algorithm
- Connect a full-function scan tool; record freeze-frame and live data while reproducing the condition (part throttle and WOT)
- Confirm code P0293 and note related codes (MAP, MAF, EGR, turbo control solenoid)
- Compare commanded vs actual boost. If actual follows commanded at low load but not at high load, suspect leak or turbo inability to produce required boost
- Perform a visual inspection of intake plumbing, intercooler, and clamps; repair any damage
- Perform a boost leak test (pressure test the intake system) and repair leaks found
- Check boost pressure (MAP) sensor: inspect wiring/connectors and measure sensor output voltage against expected values; replace if out of spec
- Test wastegate/bypass actuator: apply vacuum/pressure or use an actuator tool; verify it opens/closes and is not stuck
- Operate wastegate control solenoid electrically with scanner or bench test; verify ECU duty cycle and solenoid response
- Inspect turbocharger mechanically: check radial/axial shaft play, housing damage, oil leaks or foreign object damage; remove and inspect if necessary
- Check exhaust system for restrictions (DPF/catalyst) and measure backpressure if suspected
- After repairs, clear codes and perform road test under representative load to confirm boost follows commanded values and code does not return
Likely causes
- Loose or split intercooler hose or loose clamp
- Wastegate actuator vacuum line disconnected or leaking
- Failed boost pressure sensor producing incorrect readings
- Wastegate solenoid stuck open or electrical/ground fault
- Turbo compressor housing or seals leaking under load
- Clogged DPF or restricted exhaust producing excessive backpressure
Fault status
Status
Control module detected lower-than-commanded boost (turbo A underboost). Engine performance reduced; investigation of boost system required.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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