Code
P0246
HUMMER
P — Powertrain
Turbocharger Wastegate Solenoid 1 High Voltage
Views:
UK: 19
EN: 28
RU: 25
AI status
Completed
Completed
100%
Causes
- Short to battery voltage on the wastegate solenoid control circuit
- Failed or internally shorted wastegate solenoid (actuator valve)
- Corroded/damaged connector or wiring harness (pin damage, chafing)
- Poor or missing ground(s) in the solenoid circuit or ECM power/ground issues
- Aftermarket modifications or incorrect replacement part with different impedance
- ECM/internal driver fault
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light on
- Reduced engine power or limp-home mode (loss of boost control)
- Erratic turbo boost (overboost or underboost)
- Stored turbo/wastegate-related fault codes
- Possible poor fuel economy or drivability issues under boost
What to check
- Scan for stored codes and freeze-frame / live data related to boost and wastegate
- Visual inspection of wastegate solenoid, connector and wiring for corrosion, damage, or pin push-out
- Backprobe connector with key ON (engine OFF) to check reference voltage and ground presence
- Measure coil resistance of solenoid with it disconnected
- Wiggle-testing wiring while monitoring signal to reproduce fault
- Check for related codes that indicate power/ground or ECM issues
Signal parameters
- Supply voltage (battery feed) typically ~11–14 V (KEY ON) — confirm with OEM wiring diagram
- Control/sense voltage at solenoid: near battery voltage when open, near 0–1 V when ECU switches to ground (values vary by manufacturer)
- Typical coil resistance (disconnected): roughly 10–50 ohms (wide range — consult factory spec)
- PWM control frequency often between ~20–200 Hz; duty cycle varies with commanded boost (vehicle-specific)
Diagnostic algorithm
- Retrieve and record freeze-frame and live data (boost, wastegate duty/PWM) with a scan tool; note conditions when DTC set.
- Perform a careful visual inspection of the solenoid, connector and wiring harness for damage, corrosion, pin corrosion or water intrusion.
- With connector disconnected, measure solenoid coil resistance and compare to factory spec. If open or shorted to case, replace solenoid.
- With key ON (engine OFF) backprobe the connector: verify constant supply voltage (if present) and the control/sense voltage at rest. Look for unexpectedly high voltage.
- Start engine and monitor the control signal with a scope or multimeter set to measure duty/PWM. Look for proper switching and voltage transitions (0–battery).
- If high voltage condition persists at the connector but not at the ECM pin, repair wiring (remove short to B+, repair chafe, corrosion).
- If wiring and solenoid check good but ECM pin shows abnormal voltage, consider ECM driver fault — verify grounds/power to ECM before replacement.
- After repairs, clear codes and perform road test under varied load to confirm boost control and that DTC does not return.
Likely causes
- Damaged connector or wiring shorted to battery voltage
- Failed wastegate solenoid (coil short or internal fault)
- Poor ground or power feed to solenoid
- Less likely: ECM driver fault
Fault status
Status
High voltage detected on Turbocharger Wastegate Solenoid 1 circuit (possible short to battery or solenoid failure).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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