P0248
Turbo/Supercharger Wastegate Solenoid B Range/Performance
When a vehicle powertrain module registers the fault code P0248, it points directly to an internal system malfunction identified as "Turbo/Supercharger Wastegate Solenoid B Range/Performance". Operating your engine under this condition may degrade long-term fuel maps.
Driver's Summary
A P0248 fault code points directly to a problem with turbo/supercharger wastegate solenoid b range/performance that the ECM has confirmed over multiple drive cycles. Typical symptoms include intermittent boost loss, check engine light. The vehicle is usually drivable, but the root cause needs attention soon to avoid more expensive repairs down the road.
Symptoms
Intermittent boost loss, check engine light
Common Causes
- Sticking wastegate solenoid B
- Vacuum leaks
- Restricted exhaust
- Damaged turbocharger
How to Fix
- 1 Clean or replace solenoid B
- 2 Fix vacuum leaks
- 3 Inspect catalytic converter
- 4 Inspect turbocharger
Technical Explanation
Code P0248 is confirmed when the ECM's diagnostic algorithm detects a parameter deviation that persists across a defined number of consecutive drive cycles. For injector-specific codes, the ECM monitors the injector control circuit voltage drop during each pulse; a shorted or open injector presents a characteristic resistance signature that differs measurably from a healthy unit. The fault remains stored in memory even after the MIL is cleared; it becomes a confirmed DTC after failing two consecutive drive cycles, and the PCM logs a freeze frame record of the engine's exact operating state at the moment of detection.
Is It Safe to Drive?
You can drive short distances, but the symptoms — intermittent boost loss, check engine light — indicate the affected system is compromised. Leaving this unresolved will lead to progressively worse fuel economy and potential damage to components beyond the original fault.
Mechanic's Pro Tip
For P0248, test the solenoid's coil resistance with a multimeter before ordering parts — most solenoids should read between 14 and 40 ohms; an open (infinite resistance) or short (near zero) confirms it's failed electrically. Also verify the PCM is commanding the solenoid by backprobing the connector with a test light during the relevant operating condition — if there's no command signal, the fault is in the PCM or wiring, not the solenoid itself.
Solenoid: 80 - 200; Turbocharger: 1,000+