What causes fault code P0248?

• Most likely: Faulty wastegate solenoid (internal electrical or mechanical failure) • Likely: Vacuum hose leaks or damaged pressure lines to the solenoid • Possible: Damaged wiring harness or corroded connectors (high resistance) • Rare: Failed turbocharger (mechanically seized wastegate flap)

How do you fix fault code P0248?

STEP 1: Visually inspect all vacuum lines and pressure hoses for cracks, blockages, or leaks. STEP 2: Inspect the electrical connector for solenoid B for corrosion or loose pins. Measure the internal resistance of the solenoid; normal range is typically 15-30 Ohms (check manufacturer specs). STEP 3: Use a diagnostic scan tool to perform an output test (bi-directional control) to verify solenoid operation. STEP 4: Use a manual vacuum/pressure pump to ensure the wastegate actuator moves smoothly. If the solenoid fails the resistance or functional test, replace the unit.

Powertrain (Engine & Gearbox)Standard EOBD

P0248 - Turbocharger Wastegate Solenoid B Range/Performance

Q: What are the symptoms of fault code P0248?

• Check Engine Light (MIL) illumination • Significant loss of engine power (Limp mode) • Erratic boost pressure (Overboost or Underboost) • Hissing sounds during acceleration (if vacuum/pressure leak exists) • Failed emissions test

Last updated:1 February 2026

Related:Wastegate-solenoid, Vakuumslangar, Turbocharger Assembly, MAP-sensor, ECM (Motorstyrenhet)

System

Powertrain (Engine & Gearbox)

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Technical Description

P0248 is set when the Engine Control Module (ECM) detects a range or performance issue within the turbocharger wastegate solenoid 'B' control circuit. Solenoid 'B' is used to regulate the wastegate actuator, which manages boost pressure. If the ECM commands a specific duty cycle and the feedback or manifold pressure sensor (MAP) readings do not correlate within the calibrated window, this code is stored. This often triggers a 'Limp Home' mode to prevent engine damage from overboost conditions.

Possible Causes

Faulty wastegate solenoid (internal electrical or mechanical failure)

Vacuum hose leaks or damaged pressure lines to the solenoid

Damaged wiring harness or corroded connectors (high resistance)

Failed turbocharger (mechanically seized wastegate flap)

Symptoms

Check Engine Light (MIL) illumination

Significant loss of engine power (Limp mode)

Erratic boost pressure (Overboost or Underboost)

Hissing sounds during acceleration (if vacuum/pressure leak exists)

Failed emissions test

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P0248 - Turbocharger Wastegate Solenoid B Range/Performance

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P0248 - Turbocharger Wastegate Solenoid B Range/Performance

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