Code
P0247
Generic
P — Powertrain
Turbocharger/Supercharger Wastegate Actuator B
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to wastegate actuator/solenoid B
- Corroded or loose connector at actuator/solenoid
- Failed wastegate actuator (mechanical sticking or broken linkage)
- Failed wastegate control solenoid (electrical failure)
- Vacuum/boost hose leak or restriction to the actuator
- Boost pressure sensor or related sensor faults providing incorrect feedback
Symptoms
- Check Engine MIL illuminated
- Reduced engine power or limp-home mode
- Incorrect boost pressure (underboost or overboost)
- Hesitation, poor acceleration, or turbo surge/whistle
- Reduced fuel economy
What to check
- Verify DTC P0247 and related codes with a scan tool; note freeze-frame and live data
- Visually inspect actuator, solenoid, vacuum/pressure lines and connectors for damage, corrosion or looseness
- Compare commanded wastegate position/duty and actual/feedback values with live data
- Check for vacuum/boost leaks and ensure vacuum reservoir/lines are intact
- Manually operate actuator (where serviceable) to confirm linkage movement and freedom of travel
- Inspect and test related sensors (boost/MAF/MAP) for plausibility
Signal parameters
- Control signal: typically a PWM duty control from 0–100% (frequency varies by manufacturer)
- Connector voltage: switched 0–12V supply present when commanded (measure at harness)
- Coil/solenoid continuity: should show low resistance (vehicle-specific; open or very high resistance indicates fault)
- Actuator travel: should move smoothly through full range when commanded or when vacuum/pressure is applied/removed
- Boost deviation: actuator faults often correlate with measured boost differing significantly from commanded boost
Diagnostic algorithm
- Retrieve and record P0247 and any related codes; record freeze-frame and live boost/wastegate data
- Perform a visual inspection of actuator/solenoid, wiring harness and vacuum/pressure hoses; repair any obvious damage
- Backprobe the actuator/solenoid connector with a multimeter or oscilloscope while commanding the actuator: verify supply voltage, ground, and PWM/duty signal
- Measure coil resistance of the solenoid/actuator (compare to service spec if available); replace if open/shorted or out of expected range
- Apply vacuum or pressure to the actuator (or bench-power the solenoid where applicable) to verify mechanical movement and that the wastegate linkage moves freely
- Pressure-test boost system and check for leaks; repair intake/boost leaks before replacing actuator
- If wiring and mechanical checks pass, swap with a known-good actuator/solenoid (if available) or replace the actuator/solenoid and clear codes
- After repair, perform a road test with live data monitoring to confirm commanded vs actual boost/wastegate operation and that the code does not return
Likely causes
- Damaged connector or pin at the actuator/solenoid
- Internal failure of the actuator or solenoid coil
- Leak or blockage in vacuum/pressure supply hose to the actuator
- Mechanical binding or detached wastegate linkage
Fault status
Status
Turbocharger/Supercharger Wastegate Actuator B — control circuit or performance fault detected by the engine control module.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Repair manuals
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Code
P0247
GWM
P — Powertrain
- Malfunction of the turbocharger solenoid B
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to wastegate actuator/solenoid B
- Corroded or loose connector at actuator/solenoid
- Failed wastegate actuator (mechanical sticking or broken linkage)
- Failed wastegate control solenoid (electrical failure)
- Vacuum/boost hose leak or restriction to the actuator
- Boost pressure sensor or related sensor faults providing incorrect feedback
Symptoms
- Check Engine MIL illuminated
- Reduced engine power or limp-home mode
- Incorrect boost pressure (underboost or overboost)
- Hesitation, poor acceleration, or turbo surge/whistle
- Reduced fuel economy
What to check
- Verify DTC P0247 and related codes with a scan tool; note freeze-frame and live data
- Visually inspect actuator, solenoid, vacuum/pressure lines and connectors for damage, corrosion or looseness
- Compare commanded wastegate position/duty and actual/feedback values with live data
- Check for vacuum/boost leaks and ensure vacuum reservoir/lines are intact
- Manually operate actuator (where serviceable) to confirm linkage movement and freedom of travel
- Inspect and test related sensors (boost/MAF/MAP) for plausibility
Signal parameters
- Control signal: typically a PWM duty control from 0–100% (frequency varies by manufacturer)
- Connector voltage: switched 0–12V supply present when commanded (measure at harness)
- Coil/solenoid continuity: should show low resistance (vehicle-specific; open or very high resistance indicates fault)
- Actuator travel: should move smoothly through full range when commanded or when vacuum/pressure is applied/removed
- Boost deviation: actuator faults often correlate with measured boost differing significantly from commanded boost
Diagnostic algorithm
- Retrieve and record P0247 and any related codes; record freeze-frame and live boost/wastegate data
- Perform a visual inspection of actuator/solenoid, wiring harness and vacuum/pressure hoses; repair any obvious damage
- Backprobe the actuator/solenoid connector with a multimeter or oscilloscope while commanding the actuator: verify supply voltage, ground, and PWM/duty signal
- Measure coil resistance of the solenoid/actuator (compare to service spec if available); replace if open/shorted or out of expected range
- Apply vacuum or pressure to the actuator (or bench-power the solenoid where applicable) to verify mechanical movement and that the wastegate linkage moves freely
- Pressure-test boost system and check for leaks; repair intake/boost leaks before replacing actuator
- If wiring and mechanical checks pass, swap with a known-good actuator/solenoid (if available) or replace the actuator/solenoid and clear codes
- After repair, perform a road test with live data monitoring to confirm commanded vs actual boost/wastegate operation and that the code does not return
Likely causes
- Damaged connector or pin at the actuator/solenoid
- Internal failure of the actuator or solenoid coil
- Leak or blockage in vacuum/pressure supply hose to the actuator
- Mechanical binding or detached wastegate linkage
Fault status
Status
Turbocharger/Supercharger Wastegate Actuator B — control circuit or performance fault detected by the engine control module.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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Code
P0247
HUMMER
P — Powertrain
Turbocharger Wastegate Solenoid 2
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to wastegate actuator/solenoid B
- Corroded or loose connector at actuator/solenoid
- Failed wastegate actuator (mechanical sticking or broken linkage)
- Failed wastegate control solenoid (electrical failure)
- Vacuum/boost hose leak or restriction to the actuator
- Boost pressure sensor or related sensor faults providing incorrect feedback
Symptoms
- Check Engine MIL illuminated
- Reduced engine power or limp-home mode
- Incorrect boost pressure (underboost or overboost)
- Hesitation, poor acceleration, or turbo surge/whistle
- Reduced fuel economy
What to check
- Verify DTC P0247 and related codes with a scan tool; note freeze-frame and live data
- Visually inspect actuator, solenoid, vacuum/pressure lines and connectors for damage, corrosion or looseness
- Compare commanded wastegate position/duty and actual/feedback values with live data
- Check for vacuum/boost leaks and ensure vacuum reservoir/lines are intact
- Manually operate actuator (where serviceable) to confirm linkage movement and freedom of travel
- Inspect and test related sensors (boost/MAF/MAP) for plausibility
Signal parameters
- Control signal: typically a PWM duty control from 0–100% (frequency varies by manufacturer)
- Connector voltage: switched 0–12V supply present when commanded (measure at harness)
- Coil/solenoid continuity: should show low resistance (vehicle-specific; open or very high resistance indicates fault)
- Actuator travel: should move smoothly through full range when commanded or when vacuum/pressure is applied/removed
- Boost deviation: actuator faults often correlate with measured boost differing significantly from commanded boost
Diagnostic algorithm
- Retrieve and record P0247 and any related codes; record freeze-frame and live boost/wastegate data
- Perform a visual inspection of actuator/solenoid, wiring harness and vacuum/pressure hoses; repair any obvious damage
- Backprobe the actuator/solenoid connector with a multimeter or oscilloscope while commanding the actuator: verify supply voltage, ground, and PWM/duty signal
- Measure coil resistance of the solenoid/actuator (compare to service spec if available); replace if open/shorted or out of expected range
- Apply vacuum or pressure to the actuator (or bench-power the solenoid where applicable) to verify mechanical movement and that the wastegate linkage moves freely
- Pressure-test boost system and check for leaks; repair intake/boost leaks before replacing actuator
- If wiring and mechanical checks pass, swap with a known-good actuator/solenoid (if available) or replace the actuator/solenoid and clear codes
- After repair, perform a road test with live data monitoring to confirm commanded vs actual boost/wastegate operation and that the code does not return
Likely causes
- Damaged connector or pin at the actuator/solenoid
- Internal failure of the actuator or solenoid coil
- Leak or blockage in vacuum/pressure supply hose to the actuator
- Mechanical binding or detached wastegate linkage
Fault status
Status
Turbocharger/Supercharger Wastegate Actuator B — control circuit or performance fault detected by the engine control module.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
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