What causes fault code P005E?

• Most likely: Damaged wiring or short to ground in the boost control solenoid harness • Likely: Failing turbocharger boost control actuator or solenoid • Possible: Blown fuse or faulty power relay supplying the actuator • Rare: Internal Engine Control Unit (ECU) failure or terminal corrosion in connectors

How do you fix fault code P005E?

STEP 1: Check fuses related to engine management and turbo systems. Visually inspect the harness and connectors at the boost control actuator for chafing or oxidation. STEP 2: Measure supply voltage at the actuator connector with ignition ON. It should be close to battery voltage (12V+). Check continuity and resistance to ground. STEP 3: Use an oscilloscope to verify the PWM signal from the ECU while commanding the component via a scan tool. Component resistance should meet OEM specs (typically 10-30 Ohms). STEP 4: If the actuator or solenoid is internally shorted or failing, replace the component and perform any necessary adaptations or calibrations using an OEM-specific diagnostic tool.

Powertrain (Engine & Gearbox)Standard EOBD

P005E - Turbocharger / Supercharger Boost Control Supply Voltage – Circuit Low

Q: What are the symptoms of fault code P005E?

• Check Engine Light (MIL) illuminated • Significant loss of engine power (Limp Mode) • Inconsistent boost levels or lack of turbo spooling sound • Increased fuel consumption • Poor throttle response and sluggish acceleration

Last updated:1 February 2026

Related:Turbocharger Boost Control Solenoid, Wastegate Actuator, Engine Control Module (ECU), Wiring Harness, Power Distribution Box (Fuses/Relays)

System

Powertrain (Engine & Gearbox)

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Technical Description

Diagnostic Trouble Code (DTC) P005E is set when the Engine Control Unit (ECU) detects that the supply voltage to the turbocharger or supercharger boost control solenoid/actuator is lower than the predefined threshold. This typically points toward a short to ground or a significant voltage drop in the control circuit. The ECU monitors the duty cycle and feedback; if the supply voltage is insufficient, the system fails to manage boost pressure effectively, resulting in the vehicle entering Restricted Performance or 'Limp Mode' to prevent engine overboost or damage.

Possible Causes

Damaged wiring or short to ground in the boost control solenoid harness

Failing turbocharger boost control actuator or solenoid

Blown fuse or faulty power relay supplying the actuator

Internal Engine Control Unit (ECU) failure or terminal corrosion in connectors

Symptoms

Check Engine Light (MIL) illuminated

Significant loss of engine power (Limp Mode)

Inconsistent boost levels or lack of turbo spooling sound

Increased fuel consumption

Poor throttle response and sluggish acceleration

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P005E - Turbocharger / Supercharger Boost Control Supply Voltage – Circuit Low

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P005E - Turbocharger / Supercharger Boost Control Supply Voltage – Circuit Low

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Do you also have other fault codes?

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other fault codes?