What Does P005F Mean?
The ECM has detected that the supply voltage to the turbocharger/supercharger boost control "B" solenoid or actuator circuit is above the normal operating range. This over-voltage condition could cause the boost control device to over-actuate, potentially leading to excessive boost pressure. The driver may notice erratic boost behavior, surging under acceleration, or the vehicle entering limp mode.
Common Causes
35%
Short to battery voltage in the boost control 'B' circuit wiring
25%
Failed boost control solenoid with internal short to power
18%
Charging system over-voltage condition (faulty voltage regulator)
14%
ECM/PCM driver circuit fault holding the circuit high
8%
Incorrect solenoid installed or pinout mismatch after repair
Diagnostic Steps
1
Verify charging system voltage — should be 13.5-14.8V at idle with accessories off. Over 15V indicates a voltage regulator problem that could cause this code across multiple circuits.
2
Disconnect the boost control 'B' solenoid and measure the voltage at the ECM-side harness connector. If voltage is still high with the solenoid disconnected, the problem is in the wiring or ECM.
3
Inspect the wiring harness for the boost control 'B' circuit for chafing against adjacent wires, especially near the battery or alternator output wire where a short to power could occur.
4
Measure the solenoid coil resistance (typically 10-30 ohms). An abnormally low reading suggests an internal short that could pull excess current and confuse the ECM's voltage monitoring.
5
Check for TSBs specific to the vehicle — some manufacturers have known issues with boost control circuit relay modules or ECM software that causes false high-voltage codes.
Estimated Repair Cost
$100 - $650
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 above the normal operating range. This over-voltage condition could cause the boost control device to over-actuate, potentially leading to excessive boost pressure. The dri...
The most common cause of P005F (Turbocharger/Supercharger Boost Control "B" Supply Voltage Circuit High) is: Short to battery voltage in the boost control 'B' circuit wiring
Typical repair costs for P005F range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
If the boost control circuit is stuck high, the turbo may over-boost, which can damage the engine or drivetrain. If you notice surging, excessive power spikes, or unusual turbo noises, stop driving immediately. If the vehicle is in limp mode, it is safe to drive short distances at low speed to a repair facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P005F to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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