Code
P0248
HUMMER
P — Powertrain
Turbocharger Wastegate Solenoid 2 Performance
AI status
Completed
Completed
100%
Causes
- Faulty turbocharger wastegate solenoid (solenoid 2)
- Open/shorted wiring or poor connector for the solenoid circuit
- Stuck or binding wastegate actuator or linkage
- Vacuum or boost leak in actuator control line
- Failed vacuum pump or boost control source (if actuator is vacuum operated)
- Faulty ECM/PCM output driver
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or poor acceleration
- Turbo overboost or underboost conditions
- Engine in limp/derate mode
- Unusual turbo noises or inconsistent boost behavior
- Increased smoke or poor fuel economy
What to check
- Retrieve freeze frame and live data with a scan tool; note boost, commanded duty cycle, and actual position/pressure
- Visually inspect wiring, connectors, and ground to the solenoid 2
- Inspect vacuum/boost hoses and actuator linkage for leaks, disconnection, or binding
- Measure solenoid coil resistance with an ohmmeter and compare to spec
- Backprobe ECM/PCM output to verify switching voltage or PWM when commanding solenoid
- Perform a bench test of the solenoid (apply appropriate voltage and observe operation) or swap with known-good solenoid if available
Signal parameters
- Typical solenoid coil resistance: roughly 10–100 ohms (manufacturer-specific) — consult service data
- Control signal: switched 0–12 V or PWM from ECM; idle/off ~0 V, activated ~12 V or variable duty cycle
- Expected duty cycle: 0–100% depending on commanded boost; varies with engine load
- PWM frequency: commonly low-to-mid Hz range (varies by design); check OEM spec
- Actuator response: movement or change in boost pressure within seconds of command
Diagnostic algorithm
- Connect a compatible scan tool, read P0248 and any related codes, record freeze frame and live data (boost, commanded duty, actual).
- Visually inspect solenoid 2 connector, wiring for damage, corrosion, or poor fit. Wiggle test while monitoring for change.
- Inspect vacuum/boost hoses and actuator linkage for leaks, cracks, blockages, or seized joints; repair or replace as needed.
- With ignition off, disconnect the solenoid and measure coil resistance to ground and between terminals; compare to spec. Replace if open/shorted or out of range.
- Backprobe the ECM output at the solenoid connector. Command the solenoid on/off while observing voltage or PWM; verify ECM is commanding correctly.
- Bench test the solenoid with appropriate voltage or apply vacuum/pressure to the actuator to confirm movement. Replace if it does not respond correctly.
- If wiring is suspect, perform a continuity test from the ECM pin to the solenoid connector and check for shorts to battery or ground.
- Inspect and test the wastegate actuator for free movement. Apply vacuum or pressure to the actuator to confirm it opens/closes smoothly.
- If wiring and solenoid test good but no actuator response, investigate vacuum/boost source (vacuum pump, boost control valve) and replace faulty components.
- Clear codes and road test to confirm repair; monitor live data to ensure commanded and actual values agree and code does not return.
Likely causes
- Damaged harness or pinched wire at the solenoid connector
- Corroded or loose electrical connector at solenoid 2
- Solenoid coil resistance out of specification (open or shorted)
- Mechanical seizure of the wastegate actuator or linkage
- Disconnected or cracked vacuum/boost hose to actuator
- Debris or oil contamination inside solenoid preventing valve movement
Fault status
Status
Turbocharger Wastegate Solenoid 2 Performance — ECM detected improper response from the wastegate solenoid 2 circuit affecting turbocharger boost control.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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