What Does P005E Mean?
The ECM has detected that the supply voltage to the turbocharger/supercharger boost control "B" solenoid or actuator circuit is below the expected threshold. This circuit powers the secondary boost control device that regulates boost pressure. The driver may experience reduced turbo boost, loss of power under acceleration, possible limp mode activation, and the check engine light.
Common Causes
35%
Damaged or corroded wiring/connector in the boost control 'B' supply circuit
25%
Failed boost control solenoid/actuator with internal short or open coil
20%
Blown fuse or faulty relay in the boost control supply circuit
12%
Poor ground connection for the boost control circuit
8%
ECM/PCM internal driver circuit failure
Diagnostic Steps
1
Check the fuse for the boost control circuit in the underhood fuse box. Replace if blown and test for shorts before operating.
2
Measure supply voltage at the boost control 'B' solenoid connector with key on engine off. Expected reading is battery voltage (12.0-14.5V). Below 10V indicates a supply-side problem.
3
Inspect the wiring harness from the fuse box to the boost control solenoid for chafing, cuts, or heat damage — especially where it routes near the turbo/exhaust where temperatures are extreme.
4
Measure the solenoid coil resistance with connector disconnected. Typical range is 10-30 ohms depending on manufacturer. An open circuit or very low resistance indicates a failed solenoid.
5
Check ground continuity from the solenoid ground pin back to the ECM ground. Resistance should be less than 0.5 ohms.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The ECM has detected that the supply voltage to the turbocharger/supercharger boost control "B" solenoid or actuator circuit is below the expected threshold. This circuit powers the secondary boost control device that regulates boost pressure. The driver may experience reduced turbo boost, loss of p...
The most common cause of P005E (Turbocharger/Supercharger Boost Control "B" Supply Voltage Circuit Low) is: Damaged or corroded wiring/connector in the boost control 'B' supply circuit
Typical repair costs for P005E range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but with significantly reduced power output. The vehicle may enter limp mode, limiting speed. Avoid situations requiring full acceleration such as highway merging until repaired. No immediate safety hazard, but repair within 1-2 weeks.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P005E to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
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