Code
P00AF
Generic
P — Powertrain
Turbocharger/Supercharger Boost Control A Module Performance
Views:
UK: 31
EN: 53
RU: 50
AI status
Completed
Completed
100%
Causes
- Faulty boost control solenoid/actuator (electronic module)
- Open/shorted wiring or poor connector to the boost control module
- Vacuum/boost hose leaks or restrictions
- Faulty boost pressure sensor (MAP/baro) or incorrect sensor signal
- PCM software/firmware fault or internal module fault
- Mechanical turbocharger/supercharger failure (wastegate, vane, actuator linkage)
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or limp-home mode
- Engine surging or poor throttle response under boost
- Unexpected overboost or underboost conditions
- Unusual turbo noise or lack of boost buildup
What to check
- Retrieve freeze frame and live data with a scan tool: commanded boost vs actual boost (MAP/boost sensor)
- Inspect wiring and connectors for the boost control solenoid/module for corrosion, broken pins, or damage
- Visually inspect all vacuum/boost hoses and intercooler piping for leaks, cracks or loose clamps
- Check fuses and ground connections related to PCM and boost control module
- Perform a smoke test or pressure test on intake and boost plumbing to locate leaks
- Check for related DTCs from MAP/boost sensor, turbo control solenoid, or PCM
Signal parameters
- Boost control solenoid coil resistance (typical): 10-60 ohms (varies by manufacturer) — compare to spec
- Control signal type: PWM duty cycle 0–100%; frequency typically 20–200 Hz depending on system
- Supply voltage to module/solenoid: ~11–14 V with ignition on
- Sensor output: MAP/boost sensor typically 0.5–4.5 V across operating range (verify sensor spec)
- Expected boost range: 0 to ~2.0 bar (0–30 psi) depending on engine; commanded vs actual delta > ~10–20 kPa (1.5–3 psi) may indicate an issue
Diagnostic algorithm
- Connect a diagnostic scan tool, read codes and freeze frame, then clear codes and attempt to reproduce the fault under the same conditions.
- Monitor live data: commanded boost (PCM request), actual boost (MAP/boost sensor), solenoid duty cycle, and wastegate/actuator position (if available). Note discrepancies.
- Inspect harness and connectors to the boost control solenoid/module and to the MAP/boost sensor. Wiggle test while monitoring for intermittent changes.
- Measure solenoid coil resistance and compare to specification. Backprobe solenoid connector and measure supply voltage and ground while the system is commanded. Verify PWM duty using a scope if available.
- Pressure/smoke test intake and boost plumbing including intercooler and wastegate/vane actuator lines to find leaks or restrictions.
- If solenoid wiring and hoses are good, bench test or replace the boost control solenoid/module and re-test. If the actuator/wastegate linkage is binding or damaged, repair or replace mechanical parts.
- Check MAP/boost sensor output and reference ground; replace sensor if out of spec.
- If electrical and mechanical components are within spec and fault persists, check for PCM updates or perform PCM diagnostics per manufacturer procedures.
- After repairs, clear codes and perform a road test under similar load conditions to confirm the issue is resolved.
Likely causes
- Damaged or leaking vacuum/boost hose to the boost control solenoid
- Boost control solenoid coil out of spec or intermittent
- Corroded connector or damaged wiring (short to battery, short to ground, open)
- Contaminated/failed boost pressure sensor giving incorrect feedback
- Stuck wastegate/vane or broken actuator linkage preventing commanded boost change
Fault status
Status
Performance fault detected in Turbocharger/Supercharger Boost Control A — commanded boost control and actual boost response do not match within expected limits.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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