Code
P2564
Generic
P — Powertrain
Turbocharger Boost Control Position Sensor A Circuit Low
Views:
UK: 23
EN: 359
RU: 100
AI status
Completed
Completed
100%
Causes
- Short to ground in sensor signal wire
- Open or damaged wiring / chafed harness
- Poor or corroded connector pin(s)
- Failed boost control position sensor (potentiometer or sensor element)
- Faulty 5V reference or ground at sensor
- ECM input driver fault
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor boost control, underboost or erratic boost
- Hesitation or lack of acceleration under load
- Possible turbo actuator not moving or stuck
- Occasional or constant fault depending on wiring/sensor condition
What to check
- Read freeze frame and live data for boost control position sensor A (voltage and position)
- Compare sensor voltage to expected values at key ON, engine OFF and engine running
- Visual inspection of turbo actuator, sensor and wiring for damage, chafing or oil contamination
- Backprobe connector to measure sensor reference (usually 5V), signal, and ground
- Wiggle-test harness while monitoring live data to reproduce fault
- Command actuator with a capable scan tool to observe movement and sensor response
Signal parameters
- Typical sensor signal: ~0.5 to ~4.5 V proportional to position (varies by manufacturer)
- Reference voltage: ~5.0 V (key ON); check for stable reference
- Ground: low-resistance chassis/ECM ground
- Expected idle/closed position: low-voltage end of range (manufacturer specific)
- Expected full travel/boosted position: high-voltage end of range (manufacturer specific)
Diagnostic algorithm
- Verify DTC: Use a scan tool to confirm P2564 is current and record freeze frame/live data for sensor A.
- Visual inspection: Check connector, pins, wiring harness to turbo actuator/sensor for damage, corrosion, or oil/moisture intrusion.
- Check reference and ground: With connector connected, backprobe and confirm reference voltage (~5 V) and good ground at key ON. If missing, trace power/ground to ECM.
- Measure signal: Backprobe sensor signal with key ON and engine OFF; note voltage. If near 0 V (or below expected threshold) suspect short to ground or sensor fault.
- Wiggle test: With live data visible, gently move wiring/harness to try to reproduce voltage changes or MIL. Repair any chafed wiring or poor connections.
- Isolate sensor: Disconnect sensor harness and measure resistance between signal pin and ground to check for short to ground. Compare to service specs if available.
- Command and observe: Use a scan tool to command turbo actuator (if supported) and observe sensor voltage change and actuator movement. No change -> mechanical or sensor fault.
- Bench/test replacement: If wiring and reference are OK but signal is incorrect, replace the sensor/actuator. Recheck live data after replacement.
- Check ECM: If new sensor shows same low reading and wiring verified good, inspect ECM input circuit or consider ECU diagnostic/repair.
- Clear codes and road test: After repair, erase DTCs and perform drive cycles to confirm fault does not return and boost behavior is restored.
Likely causes
- Sensor signal wire shorted to ground or making poor contact
- Corroded or pushed-out connector pin causing low voltage
- Failed position sensor (internal short or open)
- Bad sensor ground or lost 5V reference from ECM
- Mechanically stuck turbo actuator giving a constant low reading
Fault status
Status
Turbocharger boost control position sensor A circuit voltage below minimum threshold detected. ECM may reduce boost control and enable limp mode until fault is addressed.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P2564
LAND ROVER
P — Powertrain
Turbocharger Boost Control Position Sensor A - Circuit
Views:
UK: 9
EN: 209
RU: 66
AI status
Completed
Completed
100%
Causes
- Short to ground in sensor signal wire
- Open or damaged wiring / chafed harness
- Poor or corroded connector pin(s)
- Failed boost control position sensor (potentiometer or sensor element)
- Faulty 5V reference or ground at sensor
- ECM input driver fault
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor boost control, underboost or erratic boost
- Hesitation or lack of acceleration under load
- Possible turbo actuator not moving or stuck
- Occasional or constant fault depending on wiring/sensor condition
What to check
- Read freeze frame and live data for boost control position sensor A (voltage and position)
- Compare sensor voltage to expected values at key ON, engine OFF and engine running
- Visual inspection of turbo actuator, sensor and wiring for damage, chafing or oil contamination
- Backprobe connector to measure sensor reference (usually 5V), signal, and ground
- Wiggle-test harness while monitoring live data to reproduce fault
- Command actuator with a capable scan tool to observe movement and sensor response
Signal parameters
- Typical sensor signal: ~0.5 to ~4.5 V proportional to position (varies by manufacturer)
- Reference voltage: ~5.0 V (key ON); check for stable reference
- Ground: low-resistance chassis/ECM ground
- Expected idle/closed position: low-voltage end of range (manufacturer specific)
- Expected full travel/boosted position: high-voltage end of range (manufacturer specific)
Diagnostic algorithm
- Verify DTC: Use a scan tool to confirm P2564 is current and record freeze frame/live data for sensor A.
- Visual inspection: Check connector, pins, wiring harness to turbo actuator/sensor for damage, corrosion, or oil/moisture intrusion.
- Check reference and ground: With connector connected, backprobe and confirm reference voltage (~5 V) and good ground at key ON. If missing, trace power/ground to ECM.
- Measure signal: Backprobe sensor signal with key ON and engine OFF; note voltage. If near 0 V (or below expected threshold) suspect short to ground or sensor fault.
- Wiggle test: With live data visible, gently move wiring/harness to try to reproduce voltage changes or MIL. Repair any chafed wiring or poor connections.
- Isolate sensor: Disconnect sensor harness and measure resistance between signal pin and ground to check for short to ground. Compare to service specs if available.
- Command and observe: Use a scan tool to command turbo actuator (if supported) and observe sensor voltage change and actuator movement. No change -> mechanical or sensor fault.
- Bench/test replacement: If wiring and reference are OK but signal is incorrect, replace the sensor/actuator. Recheck live data after replacement.
- Check ECM: If new sensor shows same low reading and wiring verified good, inspect ECM input circuit or consider ECU diagnostic/repair.
- Clear codes and road test: After repair, erase DTCs and perform drive cycles to confirm fault does not return and boost behavior is restored.
Likely causes
- Sensor signal wire shorted to ground or making poor contact
- Corroded or pushed-out connector pin causing low voltage
- Failed position sensor (internal short or open)
- Bad sensor ground or lost 5V reference from ECM
- Mechanically stuck turbo actuator giving a constant low reading
Fault status
Status
Turbocharger boost control position sensor A circuit voltage below minimum threshold detected. ECM may reduce boost control and enable limp mode until fault is addressed.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Your experience will help others
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Was this AI description helpful?
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