P2C29

Code

Generic P — Powertrain

Turbocharger/Supercharger Bypass Valve B Stuck

Brand: Generic

Type: P — Powertrain

Views: UK: 19 EN: 28 RU: 22

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Page language: EN

Stuck or seized bypass/diverter/wastegate valve (carbon, corrosion, debris)
Failed or intermittent bypass valve solenoid/actuator (electrical or mechanical failure)
Blocked, collapsed, disconnected or leaking vacuum/pressure line to the actuator
Wiring harness fault: open, short to power/ground, corroded connector, poor pin contact
Faulty boost control valve driver in the PCM/ECM or software anomaly
External boost leak (intake duct, intercooler, clamps) causing incorrect feedback

Read and record freeze-frame and live data using a scan tool (boost target vs actual, commanded valve position)
Visual inspection of bypass valve, actuator, hoses and vacuum/pressure lines for damage, kinks or disconnections
Inspect electrical connector for corrosion, bent pins or poor mating
Check for external intake and intercooler leaks (pressure test if available)
Measure solenoid/actuator coil resistance and compare to specification
Attempt to command the valve open/closed with a scan tool while observing movement and boost response

Command signal: PWM duty cycle or on/off command from PCM (0–100% duty typical)
Solenoid/actuator coil resistance: typical range often 10–40 Ω (refer to vehicle spec)
Actuator movement: full travel when vacuum/pressure applied (qualitative)
Boost pressure: compare commanded boost vs measured boost in kPa/bar or psi
Voltage at connector: reference voltage (typically 12 V) and ground continuity

Verify the DTC and note freeze-frame data. Check for additional turbo/boost-related codes.
Perform visual inspection around Turbo B: hoses, pipes, clamps, intercooler, valve and actuator for damage or leaks.
With a scan tool, observe live data while commanding the bypass valve. Note whether commanded position and actual response match.
Manually actuate the valve: apply appropriate vacuum/pressure to the actuator or operate actuator electrically per service manual to confirm mechanical movement. Replace if seized.
Measure solenoid/coil resistance and check for proper supply voltage and ground at the connector while commanding. Repair wiring or connector issues as needed.
Smoke-test intake/charge piping and intercooler for leaks that could mask proper operation.
If valve and plumbing are good but no proper control, bench-test/replace the solenoid/valve assembly. If electrical control remains inconsistent, check PCM driver outputs and related circuits.
After repairs, clear codes and perform a road/load test while monitoring boost and valve operation to confirm the fault is resolved.