Code
P0248
Generic
P — Powertrain
Turbocharger/Supercharger Wastegate Actuator B Range/Performance
AI status
Completed
Completed
100%
Causes
- Open, shorted or intermittent wiring/connectors to the wastegate actuator or boost control solenoid (Bank B)
- Failed or sticking wastegate actuator (diaphragm, rod, or internal mechanism)
- Faulty boost control solenoid or valve (PWM solenoid) that controls actuator B
- Intake or boost leaks allowing unexpected pressure/position feedback
- Blocked or restricted vacuum/pressure line to the actuator
- Contaminated or seized wastegate linkage or external bypass valve
Symptoms
- MIL/Check Engine lamp on
- Reduced engine power or limp mode to protect engine
- Underboost (low turbo boost) or inconsistent boost response
- Overboost condition possible if actuator stuck closed (rare)
- Hesitation, poor acceleration or surging during boost
- Stored related boost or turbocharger fault codes
What to check
- Retrieve freeze frame and live data for boost pressure, commanded vs actual wastegate position, and related turbo control parameters
- Visually inspect wiring and connectors at the actuator and boost control solenoid for damage, corrosion, or loose pins
- Check for vacuum/pressure hose routing, kinks, blockages or leaks
- Measure solenoid coil resistance and check PWM control signal from ECM with a scope or multimeter
- Operate or apply pressure/vacuum to the actuator to confirm movement and hold
- Smoke test intake and boost plumbing for leaks
Signal parameters
- Actuator position sensor (if present): typical idle voltage 0.5–4.5 V (vehicle-specific)
- Boost control solenoid coil resistance: commonly ~10–30 Ω (vehicle-specific — consult manual)
- ECM control signal to solenoid: PWM duty 0–100% (typical frequency 50–300 Hz depending on vehicle)
- Commanded wastegate/boost control value: 0–100% (controller-specific)
- Boost pressure range: 0 kPa (vacuum) to expected boost (e.g., up to 200–250 kPa absolute or typical psi values) — compare commanded vs actual
Diagnostic algorithm
- Read and record freeze-frame data and all stored codes. Note related turbo/boost codes and engine conditions when fault set.
- Verify symptom: monitor live data for commanded vs actual wastegate position (or boost control duty) and intake boost pressure during a test drive or controlled run.
- Perform a thorough visual inspection of wiring, connectors, and grounding for the actuator and boost control solenoid (Bank B). Repair any damage.
- With ignition off, disconnect actuator/solenoid connectors and inspect terminals for corrosion, bent pins, or contamination. Reconnect securely.
- Measure solenoid coil resistance; compare with manufacturer spec. If open/shorted or out of range, replace solenoid.
- Backprobe/control pin at ECM while commanding actuator/solenoid (using bidirectional tool) and confirm proper PWM/voltage output. If ECM does not command correctly, inspect harness and ECM grounds.
- Bench or apply vacuum/pressure to the actuator to confirm it moves smoothly and holds pressure. If actuator fails to move or leaks, replace actuator.
- Inspect and free any seized wastegate linkage or external bypass valve. Verify full range of motion and correct end-stops.
- Perform a smoke test of the intake/boost plumbing to locate leaks that would cause incorrect position readings or poor boost response.
- If wiring, solenoid and actuator check good, consider replacing actuator or solenoid as appropriate, then clear codes and perform a monitored road test under load.
- If the problem persists after component replacement, evaluate ECM/PCM operation, reference TSBs and manufacturer diagnostics, and consider module reprogramming or replacement only after exhausting wiring and component checks.
Likely causes
- Damaged harness at the turbocharger or near the actuator connector
- Boost control solenoid coil open or shorted
- Wastegate actuator diaphragm ruptured or rod seized
- Vacuum/pressure hose disconnected, collapsed or clogged
- Corroded or loose electrical connector pins
- Mechanical binding at the wastegate arm/linkage due to carbon or corrosion
Fault status
Status
ECM detected wastegate actuator B position or control signal outside expected range/performance. MIL illuminated. Engine may be in reduced power mode; boost control limited until condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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Code
P0248
GWM
P — Powertrain
- Invalid indicator / turbocharger solenoid B not adjusted
AI status
Completed
Completed
100%
Causes
- Open, shorted or intermittent wiring/connectors to the wastegate actuator or boost control solenoid (Bank B)
- Failed or sticking wastegate actuator (diaphragm, rod, or internal mechanism)
- Faulty boost control solenoid or valve (PWM solenoid) that controls actuator B
- Intake or boost leaks allowing unexpected pressure/position feedback
- Blocked or restricted vacuum/pressure line to the actuator
- Contaminated or seized wastegate linkage or external bypass valve
Symptoms
- MIL/Check Engine lamp on
- Reduced engine power or limp mode to protect engine
- Underboost (low turbo boost) or inconsistent boost response
- Overboost condition possible if actuator stuck closed (rare)
- Hesitation, poor acceleration or surging during boost
- Stored related boost or turbocharger fault codes
What to check
- Retrieve freeze frame and live data for boost pressure, commanded vs actual wastegate position, and related turbo control parameters
- Visually inspect wiring and connectors at the actuator and boost control solenoid for damage, corrosion, or loose pins
- Check for vacuum/pressure hose routing, kinks, blockages or leaks
- Measure solenoid coil resistance and check PWM control signal from ECM with a scope or multimeter
- Operate or apply pressure/vacuum to the actuator to confirm movement and hold
- Smoke test intake and boost plumbing for leaks
Signal parameters
- Actuator position sensor (if present): typical idle voltage 0.5–4.5 V (vehicle-specific)
- Boost control solenoid coil resistance: commonly ~10–30 Ω (vehicle-specific — consult manual)
- ECM control signal to solenoid: PWM duty 0–100% (typical frequency 50–300 Hz depending on vehicle)
- Commanded wastegate/boost control value: 0–100% (controller-specific)
- Boost pressure range: 0 kPa (vacuum) to expected boost (e.g., up to 200–250 kPa absolute or typical psi values) — compare commanded vs actual
Diagnostic algorithm
- Read and record freeze-frame data and all stored codes. Note related turbo/boost codes and engine conditions when fault set.
- Verify symptom: monitor live data for commanded vs actual wastegate position (or boost control duty) and intake boost pressure during a test drive or controlled run.
- Perform a thorough visual inspection of wiring, connectors, and grounding for the actuator and boost control solenoid (Bank B). Repair any damage.
- With ignition off, disconnect actuator/solenoid connectors and inspect terminals for corrosion, bent pins, or contamination. Reconnect securely.
- Measure solenoid coil resistance; compare with manufacturer spec. If open/shorted or out of range, replace solenoid.
- Backprobe/control pin at ECM while commanding actuator/solenoid (using bidirectional tool) and confirm proper PWM/voltage output. If ECM does not command correctly, inspect harness and ECM grounds.
- Bench or apply vacuum/pressure to the actuator to confirm it moves smoothly and holds pressure. If actuator fails to move or leaks, replace actuator.
- Inspect and free any seized wastegate linkage or external bypass valve. Verify full range of motion and correct end-stops.
- Perform a smoke test of the intake/boost plumbing to locate leaks that would cause incorrect position readings or poor boost response.
- If wiring, solenoid and actuator check good, consider replacing actuator or solenoid as appropriate, then clear codes and perform a monitored road test under load.
- If the problem persists after component replacement, evaluate ECM/PCM operation, reference TSBs and manufacturer diagnostics, and consider module reprogramming or replacement only after exhausting wiring and component checks.
Likely causes
- Damaged harness at the turbocharger or near the actuator connector
- Boost control solenoid coil open or shorted
- Wastegate actuator diaphragm ruptured or rod seized
- Vacuum/pressure hose disconnected, collapsed or clogged
- Corroded or loose electrical connector pins
- Mechanical binding at the wastegate arm/linkage due to carbon or corrosion
Fault status
Status
ECM detected wastegate actuator B position or control signal outside expected range/performance. MIL illuminated. Engine may be in reduced power mode; boost control limited until condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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Code
P0248
HUMMER
P — Powertrain
Turbocharger Wastegate Solenoid 2 Performance
AI status
Completed
Completed
100%
Causes
- Open, shorted or intermittent wiring/connectors to the wastegate actuator or boost control solenoid (Bank B)
- Failed or sticking wastegate actuator (diaphragm, rod, or internal mechanism)
- Faulty boost control solenoid or valve (PWM solenoid) that controls actuator B
- Intake or boost leaks allowing unexpected pressure/position feedback
- Blocked or restricted vacuum/pressure line to the actuator
- Contaminated or seized wastegate linkage or external bypass valve
Symptoms
- MIL/Check Engine lamp on
- Reduced engine power or limp mode to protect engine
- Underboost (low turbo boost) or inconsistent boost response
- Overboost condition possible if actuator stuck closed (rare)
- Hesitation, poor acceleration or surging during boost
- Stored related boost or turbocharger fault codes
What to check
- Retrieve freeze frame and live data for boost pressure, commanded vs actual wastegate position, and related turbo control parameters
- Visually inspect wiring and connectors at the actuator and boost control solenoid for damage, corrosion, or loose pins
- Check for vacuum/pressure hose routing, kinks, blockages or leaks
- Measure solenoid coil resistance and check PWM control signal from ECM with a scope or multimeter
- Operate or apply pressure/vacuum to the actuator to confirm movement and hold
- Smoke test intake and boost plumbing for leaks
Signal parameters
- Actuator position sensor (if present): typical idle voltage 0.5–4.5 V (vehicle-specific)
- Boost control solenoid coil resistance: commonly ~10–30 Ω (vehicle-specific — consult manual)
- ECM control signal to solenoid: PWM duty 0–100% (typical frequency 50–300 Hz depending on vehicle)
- Commanded wastegate/boost control value: 0–100% (controller-specific)
- Boost pressure range: 0 kPa (vacuum) to expected boost (e.g., up to 200–250 kPa absolute or typical psi values) — compare commanded vs actual
Diagnostic algorithm
- Read and record freeze-frame data and all stored codes. Note related turbo/boost codes and engine conditions when fault set.
- Verify symptom: monitor live data for commanded vs actual wastegate position (or boost control duty) and intake boost pressure during a test drive or controlled run.
- Perform a thorough visual inspection of wiring, connectors, and grounding for the actuator and boost control solenoid (Bank B). Repair any damage.
- With ignition off, disconnect actuator/solenoid connectors and inspect terminals for corrosion, bent pins, or contamination. Reconnect securely.
- Measure solenoid coil resistance; compare with manufacturer spec. If open/shorted or out of range, replace solenoid.
- Backprobe/control pin at ECM while commanding actuator/solenoid (using bidirectional tool) and confirm proper PWM/voltage output. If ECM does not command correctly, inspect harness and ECM grounds.
- Bench or apply vacuum/pressure to the actuator to confirm it moves smoothly and holds pressure. If actuator fails to move or leaks, replace actuator.
- Inspect and free any seized wastegate linkage or external bypass valve. Verify full range of motion and correct end-stops.
- Perform a smoke test of the intake/boost plumbing to locate leaks that would cause incorrect position readings or poor boost response.
- If wiring, solenoid and actuator check good, consider replacing actuator or solenoid as appropriate, then clear codes and perform a monitored road test under load.
- If the problem persists after component replacement, evaluate ECM/PCM operation, reference TSBs and manufacturer diagnostics, and consider module reprogramming or replacement only after exhausting wiring and component checks.
Likely causes
- Damaged harness at the turbocharger or near the actuator connector
- Boost control solenoid coil open or shorted
- Wastegate actuator diaphragm ruptured or rod seized
- Vacuum/pressure hose disconnected, collapsed or clogged
- Corroded or loose electrical connector pins
- Mechanical binding at the wastegate arm/linkage due to carbon or corrosion
Fault status
Status
ECM detected wastegate actuator B position or control signal outside expected range/performance. MIL illuminated. Engine may be in reduced power mode; boost control limited until condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
Similar codes
Repair manuals
Manual library for HUMMER
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