Code
P003A
LAND ROVER
P — Powertrain
Turbocharger / supercharger boost control A - Position exceeded learning limit
Views:
UK: 14
EN: 50
RU: 26
AI status
Completed
Completed
100%
Causes
- Stuck or seized turbo vane/wastegate linkage or actuator
- Faulty actuator motor, vacuum/pressure solenoid or position sensor
- Damaged wiring or poor connector to actuator/position sensor
- Blocked or leaking vacuum/boost supply (if vacuum-operated actuator)
- Mechanical turbocharger damage or carbon buildup preventing movement
- Failed or interrupted adaptation/relearn procedure
Symptoms
- MIL/Check Engine lamp illuminated
- Reduced engine power or limp mode
- Poor throttle response or turbo lag
- High or low measured boost compared with commanded
- Unusual turbo noises or smoke in severe mechanical cases
What to check
- Read and record freeze frame and all stored DTCs
- Visually inspect actuator, linkages, vacuum/pressure hoses and connectors
- Check continuity and voltage at actuator and position sensor connectors
- Use diagnostic tool to monitor commanded vs actual actuator position and boost pressure
- Perform actuator enable tests from a scan tool (command open/close) and observe response
- Inspect intake and intercooler for leaks; check boost pressure sensor operation
Signal parameters
- Commanded actuator position (duty cycle % or commanded angle)
- Actual actuator/position sensor reading (degrees or %)
- Turbocharger boost pressure (kPa or bar)
- Wastegate/vanes control solenoid duty cycle (%)
- Vacuum/pressure supply level to actuator (kPa)
- Engine RPM and throttle position during test
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note related boost or sensor codes.
- Visually inspect actuator, mounting, linkage, vacuum/pressure lines and electrical connectors for damage or disconnection.
- Using a scan tool, command the actuator through its range while observing actual position; note any lack of movement or position out-of-range.
- Measure voltage/resistance at actuator and position sensor pins; check continuity to the ECM and inspect for corrosion or intermittent connections.
- Verify vacuum/pressure supply and solenoid operation (if applicable); replace blocked hoses or faulty solenoids.
- If actuator does not move electrically, bench-test or replace actuator/solenoid. If position sensor reading is incorrect, replace sensor.
- Inspect turbocharger vane/wastegate for mechanical seizure or heavy carbon build-up; remove and repair/replace turbo if mechanical binding is confirmed.
- After repairs, perform manufacturer-specific boost actuator adaptation/relearn procedure with a diagnostic tool.
- Clear codes, road test under varied load, and recheck for DTCs and proper commanded vs actual position and boost control.
- Safety note: Perform mechanical inspections only when the engine and turbo are cool; follow manufacturer procedures for high-temperature components.
Likely causes
- Actuator or solenoid failure (electrical or vacuum)
- Position sensor out of range or failed
- Linkage binding or seized internal vanes/wastegate
- Wiring harness open/short/corroded connector at actuator
- Boost/vacuum supply hose blocked or leaking
Fault status
Status
Turbocharger/supercharger boost control A position exceeded learning limit — adaptation failed. ECM flagged circuit for service.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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