P0247
Turbo/Supercharger Wastegate Solenoid B
If your vehicle's onboard computer has flagged the diagnostic trouble code P0247, it refers to a detected anomaly regarding "Turbo/Supercharger Wastegate Solenoid B". This systemic engine fault needs a targeted check before symptoms expand.
Driver's Summary
Your vehicle's computer logged P0247 after detecting a malfunction in the turbo/supercharger wastegate solenoid b system. You may notice erratic boost levels, engine surging, check engine light, all of which are direct consequences of this malfunction. Given the high severity of this code, continuing to drive risks significant mechanical damage. Have it diagnosed immediately.
Symptoms
Erratic boost levels, engine surging, check engine light
Common Causes
- Failed wastegate control solenoid B
- Torn actuator diaphragm
- Clogged vacuum lines
- Damaged wiring
How to Fix
- 1 Replace wastegate solenoid B
- 2 Test and replace actuator
- 3 Clear vacuum lines
- 4 Repair wiring
Technical Explanation
To set P0247, the PCM samples the affected circuit multiple times per second, comparing live readings against manufacturer-programmed operating windows. Misfire rate is counted per cylinder over rolling windows and compared against two thresholds: a catalyst-damaging rate (triggers flashing MIL) and an emissions-exceeding rate (triggers solid MIL). The PCM logs which cylinder is misfiring based on crankshaft position at the time of each detected event. Once confirmed, the code is stored as a permanent DTC and the MIL is activated. The freeze frame snapshot — recording RPM, load, coolant temperature, and fuel trim at fault detection — is also saved and is critical for accurate diagnosis.
Is It Safe to Drive?
This fault carries real mechanical risk. The root causes — including failed wastegate control solenoid b — can trigger a chain reaction of component failures if the vehicle continues to be driven. Have it towed or drive directly to a shop without delay.
Mechanic's Pro Tip
For P0247, always perform a smoke test before replacing any parts — unmetered air from a cracked intake boot, split hose, or failed gasket is the root cause in the majority of lean fault cases and costs almost nothing to fix. After any repair, clear the code and watch short-term fuel trim (STFT) live on a scan tool; it should recover to within ±5% at idle within 2–3 minutes if the vacuum leak is truly resolved.
Solenoid: 80 - 200; Actuator: 150 - 300