DTC P00B00 – Turbocharger/Supercharger Boost Control “B” Module Performance.

This code indicates the PCM has detected improper performance of the Boost Control “B” actuator/module, usually related to VGT actuator, wastegate actuator, or electronic boost control solenoid (depending on the vehicle).

✅ Meaning of P00B00

The PCM sees that the Boost Control “B” system (usually the secondary turbo or secondary boost actuator on twin-turbo engines) is not responding as expected, producing incorrect boost levels.

This may be caused by:

Stuck or weak wastegate actuator

Stuck VGT (variable geometry turbo) vanes

Faulty boost control actuator motor

Boost control vacuum/pressure problems

Damaged wiring to the actuator

PCM logic fault (rare)

✅ Common Symptoms

Low power / limp mode

Turbo lag

Overboost or underboost

Whistling or unusual turbo noise

Black smoke (VGT stuck)

Check Engine Light ON

🔧 Step-by-Step Diagnostic Procedure

1. Scan live data

Check the following PIDs:

Boost pressure (MAP)

Target boost vs. actual boost

Turbo actuator position

Wastegate duty cycle / VGT vane position

Actuator “B” feedback signal

If actual boost does not match target → actuator issue likely.

2. Inspect turbo actuator “B”

Depending on system type:

👉🏻 Electronic actuator (common in modern diesels and turbo petrol)

Check for:

Broken gear mechanism in the actuator

Stuck or corroded linkage

Water intrusion in actuator motor

Noisy actuator motor

Perform actuator sweep test using a scan tool.
If it fails to move smoothly → replace actuator.

👉🏻 Vacuum-type wastegate actuator

Check:

Vacuum supply from pump

Cracked vacuum hoses

Boost control solenoid sticking

Wastegate arm movement (should move freely by hand with vacuum applied)

Use a vacuum pump:

Apply 10–15 inHg vacuum

If actuator does not hold → diaphragm leak → replace actuator.

3. Inspect boost control solenoid (if used)

Common faults:

Solenoid stuck open/closed

Electrical open/short

Contaminated with oil or dust

Test:

Check resistance (typically 20–40Ω depending on vehicle)

Activate with scan tool → listen for clicking

Verify vacuum/pressure switching

4. Check Wiring & Connectors

Look for:

Corrosion inside connectors

Water/dust contamination

Broken wires near actuator plug

High resistance in signal or ground circuit

Perform:

Voltage supply check (usually 5V or 12V depending on actuator type)

Ground continuity

Signal line continuity to PCM

5. Check for Mechanical Turbo Issues

Stuck VGT vanes (common in diesels)

Oil sludge causing vane binding

Shaft wear or binding

Cracked intercooler hose → underboost

Boost leaks in charge pipes

Pressurize the intake system to 10–15 PSI and check for leaks.

6. Reflash / Relearn (if applicable)

Some vehicles require:

Turbo actuator calibration

PCM software update

VGT relearn procedure
After replacing actuator/turbo.

🎯 Most Common Fixes

Replace turbo electronic actuator

Clean/repair VGT mechanism

Replace wastegate actuator or solenoid

Repair/replace vacuum hoses

Fix wiring issues or connector corrosion

Repair boost leaks

Replace turbocharger (if mechanical failure)

Welcome To Madurai Car Service 💐🙏🏻.