P00D5
Turbocharger/Supercharger Boost Control B PerformanceP00D5 is a generic OBD-II powertrain diagnostic trouble code: Turbocharger/Supercharger Boost Control B Performance. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P00D5 means
DTC P00D5 is the B circuit equivalent of the boost control performance fault, set when the ECM determines that the Turbocharger/Supercharger Boost Control B system is not achieving commanded boost targets within the allowable deviation band. On single-turbo engines the B designation typically refers to a secondary actuator or a second boost control stage; on twin-turbo or compound-turbo setups it refers to the second turbocharger's control circuit.
The fault logic monitors the difference between commanded and actual boost over a defined evaluation window. If the error persists beyond the calibrated threshold, P00D5 is stored. The most common causes parallel those of the A-circuit code: actuator wear, solenoid degradation, charge air leaks, and sensor drift. However, because the B circuit is often secondary, technicians should also consider inter-stage plumbing and bypass valve integrity on two-stage systems.
Repair strategy should begin with live data comparison and a boost leak test of the B-circuit plumbing before component replacement. On twin-scroll or twin-turbo configurations, verify that the B turbocharger spools correctly and that its wastegate operates through its full range of travel.
Common causes
Most-frequently reported root causes when P00D5 is logged.
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1
Sticking or damaged wastegate actuator on the B turbocharger or second boost stage.
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2
Boost control solenoid for the B circuit with degraded mechanical response.
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3
Charge air leak in the B-circuit plumbing or intercooler.
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4
Drifted or contaminated boost pressure sensor associated with the B circuit.
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5
Worn B turbocharger with reduced compressor efficiency.
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6
Bypass or diverter valve on the B circuit not seating or opening correctly.
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7
Restriction in the intake path upstream of the B turbocharger compressor.
Symptoms drivers notice
How to diagnose P00D5
A typical diagnostic flow when this code is present.
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1
Read all DTCs and note whether both A and B circuit codes are present, which could indicate a shared sensor or wiring fault.
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2
Monitor live boost data for the B circuit to quantify the commanded vs. actual deviation.
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3
Pressure-test the B-circuit charge air plumbing for leaks with the engine off.
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4
Inspect and electrically test the B-circuit boost control solenoid, including connector integrity and coil resistance.
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5
Check the B-circuit wastegate actuator for free movement and diaphragm integrity.
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6
Inspect the boost pressure sensor specific to the B circuit and compare its readings against a reference.
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7
Evaluate the B turbocharger for shaft play or bearing degradation if all upstream components test satisfactorily.
Vehicles where we've handled P00D5
Platforms in our catalogue with confirmed P00D5 coverage.
Related powertrain codes
Frequently asked questions
Is P00D5 the same fault as P00C6 on a different turbo?
Functionally yes, on twin-turbo systems. P00C6 applies to the A (typically primary) boost control circuit; P00D5 applies to the B (typically secondary) circuit. The diagnosis approach is similar but targets B-circuit components.
Can I drive with P00D5 active?
The vehicle may be drivable in a reduced-power mode, but prolonged operation with an unresolved boost control fault risks engine damage. Address it as soon as practical.
Does P00D5 require replacing the turbocharger?
Not necessarily. Solenoid, wastegate, and plumbing faults are more commonly responsible than internal turbocharger failure. Follow a systematic diagnostic approach before condemning the turbo.
Can an air filter restriction set P00D5?
A severely restricted intake filter can reduce airflow to the B compressor and contribute to an inability to reach boost targets, though it is a less common cause than actuator or leak faults.
Disabling P00D5 in software
RaceTune can permanently disable P00D5 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
ECUs with a P00D5 disable in our catalogue
Confirmed coverage from our recipe database — we support many more families. Upload your file and our identifier will match it automatically.
- Bosch EDC17C50 verified 1 software version
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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