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Home / DTC / P0046 — Turbocharger/Supercharger Boost Control A Circuit Range/Performance

P0046 — Turbocharger/Supercharger Boost Control A Circuit Range/Performance

Detailed page for trouble code P0046.

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59brands
11,914generic
22,491specific
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P0046

Generic P — Powertrain

Turbocharger/Supercharger Boost Control A Circuit Range/Performance

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty boost control solenoid (electrically or internally clogged)
  • Damaged or shorted wiring/poor connector to solenoid or pressure sensor
  • Faulty boost pressure (MAP) sensor or incorrect sensor readings
  • Stuck or damaged turbo actuator or wastegate (mechanical binding)
  • Open or leaking vacuum/boost control hoses
  • Faulty PCM/ECU or incorrect software/calibration

Symptoms

  • Check Engine Light (MIL) illuminated
  • Loss of engine power, poor acceleration or limp-in mode
  • Excessive or insufficient boost pressure under load
  • Hesitation, surging, or poor drivability at boost conditions
  • Reduced fuel economy

What to check

  • Read freeze frame/fault details and confirm P0046 presence and related codes
  • Scan tool — compare commanded boost (target) vs actual boost (measured) in live data
  • Inspect boost control solenoid connector and wiring for damage, corrosion, or loose pins
  • Visually inspect vacuum/boost hoses for cracks, disconnections or restrictions
  • Check boost pressure (MAP) sensor voltage and compare to expected values
  • Measure solenoid resistance and apply bench power/PWM to verify operation

Signal parameters

  • Vehicle battery supply to solenoid: ~12 V (key ON/engine running)
  • Control signal: PWM duty 0–100% (frequency often 20–300 Hz depending on vehicle)
  • Typical boost control solenoid resistance: commonly 10–50 Ω (manufacturer-specific)
  • MAP/boost sensor output: roughly 0.5 V (atmospheric/no boost) to ~4.5 V (high boost) — check OEM spec
  • Expected: commanded boost vs actual boost should track closely under steady load (small deviation)

Diagnostic algorithm

  1. Confirm the code and note freeze-frame data. Clear DTCs and perform a road test to see if P0046 returns.
  2. Using a scan tool, monitor commanded boost (request) and measured boost (actual) while inducing boost (wide-open throttle). Confirm if actual boost deviates from target.
  3. Inspect wiring and connectors to boost control solenoid and boost sensor for damage, corrosion, bent pins, or poor connections. Repair as needed.
  4. Visually check all vacuum/boost hoses between solenoid, actuator, and turbo for leaks, kinks, or blockages. Replace defective hoses.
  5. Unplug solenoid and measure coil resistance. If out of expected range or open/shorted, replace solenoid.
  6. Bench-test solenoid with correct voltage/PWM (or use an inline power source) to confirm it actuates and vents/opens as designed.
  7. Verify power and ground at solenoid connector with a multimeter while operating the control circuit. Look for intermittent supply or poor ground.
  8. Check MAP/boost sensor output on the scan tool and with a voltmeter to verify sensor accuracy. Replace or test further if readings are implausible.
  9. Inspect turbo actuator/wastegate linkage for free movement. Manually operate actuator (where safe) to confirm mechanical function and check for binding.
  10. If electrical and mechanical components check OK, inspect PCM outputs for proper PWM using an oscilloscope or known-good scan tool parameter. Consider reflash or ECU replacement only after exhausting wiring/actuator/sensor checks.
  11. After repairs, clear DTCs and re-test under various load conditions to confirm the fault is resolved and boost tracks commanded values.

Likely causes

  • Failed boost control solenoid (common failure point)
  • Broken/grounded PWM control wire to the solenoid
  • Loose or corroded connector at boost solenoid or MAP sensor
  • Vacuum hose disconnected or split between solenoid and actuator
  • MAP/boost sensor sending implausible voltage under load
  • Wastegate actuator linkage disconnected or seized

Fault status

⚠️ Status
P0046 — Turbocharger/Supercharger Boost Control A Circuit Range/Performance. Inspect boost control solenoid, wiring/connector, MAP/boost sensor, vacuum lines and actuator. Verify commanded vs actual boost.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P0046

LAND ROVER P — Powertrain

Turbo / compressor control boost solenoid - range ride / performance

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty boost control solenoid (electrically or internally clogged)
  • Damaged or shorted wiring/poor connector to solenoid or pressure sensor
  • Faulty boost pressure (MAP) sensor or incorrect sensor readings
  • Stuck or damaged turbo actuator or wastegate (mechanical binding)
  • Open or leaking vacuum/boost control hoses
  • Faulty PCM/ECU or incorrect software/calibration

Symptoms

  • Check Engine Light (MIL) illuminated
  • Loss of engine power, poor acceleration or limp-in mode
  • Excessive or insufficient boost pressure under load
  • Hesitation, surging, or poor drivability at boost conditions
  • Reduced fuel economy

What to check

  • Read freeze frame/fault details and confirm P0046 presence and related codes
  • Scan tool — compare commanded boost (target) vs actual boost (measured) in live data
  • Inspect boost control solenoid connector and wiring for damage, corrosion, or loose pins
  • Visually inspect vacuum/boost hoses for cracks, disconnections or restrictions
  • Check boost pressure (MAP) sensor voltage and compare to expected values
  • Measure solenoid resistance and apply bench power/PWM to verify operation

Signal parameters

  • Vehicle battery supply to solenoid: ~12 V (key ON/engine running)
  • Control signal: PWM duty 0–100% (frequency often 20–300 Hz depending on vehicle)
  • Typical boost control solenoid resistance: commonly 10–50 Ω (manufacturer-specific)
  • MAP/boost sensor output: roughly 0.5 V (atmospheric/no boost) to ~4.5 V (high boost) — check OEM spec
  • Expected: commanded boost vs actual boost should track closely under steady load (small deviation)

Diagnostic algorithm

  1. Confirm the code and note freeze-frame data. Clear DTCs and perform a road test to see if P0046 returns.
  2. Using a scan tool, monitor commanded boost (request) and measured boost (actual) while inducing boost (wide-open throttle). Confirm if actual boost deviates from target.
  3. Inspect wiring and connectors to boost control solenoid and boost sensor for damage, corrosion, bent pins, or poor connections. Repair as needed.
  4. Visually check all vacuum/boost hoses between solenoid, actuator, and turbo for leaks, kinks, or blockages. Replace defective hoses.
  5. Unplug solenoid and measure coil resistance. If out of expected range or open/shorted, replace solenoid.
  6. Bench-test solenoid with correct voltage/PWM (or use an inline power source) to confirm it actuates and vents/opens as designed.
  7. Verify power and ground at solenoid connector with a multimeter while operating the control circuit. Look for intermittent supply or poor ground.
  8. Check MAP/boost sensor output on the scan tool and with a voltmeter to verify sensor accuracy. Replace or test further if readings are implausible.
  9. Inspect turbo actuator/wastegate linkage for free movement. Manually operate actuator (where safe) to confirm mechanical function and check for binding.
  10. If electrical and mechanical components check OK, inspect PCM outputs for proper PWM using an oscilloscope or known-good scan tool parameter. Consider reflash or ECU replacement only after exhausting wiring/actuator/sensor checks.
  11. After repairs, clear DTCs and re-test under various load conditions to confirm the fault is resolved and boost tracks commanded values.

Likely causes

  • Failed boost control solenoid (common failure point)
  • Broken/grounded PWM control wire to the solenoid
  • Loose or corroded connector at boost solenoid or MAP sensor
  • Vacuum hose disconnected or split between solenoid and actuator
  • MAP/boost sensor sending implausible voltage under load
  • Wastegate actuator linkage disconnected or seized

Fault status

⚠️ Status
P0046 — Turbocharger/Supercharger Boost Control A Circuit Range/Performance. Inspect boost control solenoid, wiring/connector, MAP/boost sensor, vacuum lines and actuator. Verify commanded vs actual boost.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0045 P0047 P0299 P0236 P0107
320

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LAND ROVER

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+100 karma for a short comment :)
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Code

P0046

MITSUBISHI P — Powertrain

Boost control solenoid range

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty boost control solenoid (electrically or internally clogged)
  • Damaged or shorted wiring/poor connector to solenoid or pressure sensor
  • Faulty boost pressure (MAP) sensor or incorrect sensor readings
  • Stuck or damaged turbo actuator or wastegate (mechanical binding)
  • Open or leaking vacuum/boost control hoses
  • Faulty PCM/ECU or incorrect software/calibration

Symptoms

  • Check Engine Light (MIL) illuminated
  • Loss of engine power, poor acceleration or limp-in mode
  • Excessive or insufficient boost pressure under load
  • Hesitation, surging, or poor drivability at boost conditions
  • Reduced fuel economy

What to check

  • Read freeze frame/fault details and confirm P0046 presence and related codes
  • Scan tool — compare commanded boost (target) vs actual boost (measured) in live data
  • Inspect boost control solenoid connector and wiring for damage, corrosion, or loose pins
  • Visually inspect vacuum/boost hoses for cracks, disconnections or restrictions
  • Check boost pressure (MAP) sensor voltage and compare to expected values
  • Measure solenoid resistance and apply bench power/PWM to verify operation

Signal parameters

  • Vehicle battery supply to solenoid: ~12 V (key ON/engine running)
  • Control signal: PWM duty 0–100% (frequency often 20–300 Hz depending on vehicle)
  • Typical boost control solenoid resistance: commonly 10–50 Ω (manufacturer-specific)
  • MAP/boost sensor output: roughly 0.5 V (atmospheric/no boost) to ~4.5 V (high boost) — check OEM spec
  • Expected: commanded boost vs actual boost should track closely under steady load (small deviation)

Diagnostic algorithm

  1. Confirm the code and note freeze-frame data. Clear DTCs and perform a road test to see if P0046 returns.
  2. Using a scan tool, monitor commanded boost (request) and measured boost (actual) while inducing boost (wide-open throttle). Confirm if actual boost deviates from target.
  3. Inspect wiring and connectors to boost control solenoid and boost sensor for damage, corrosion, bent pins, or poor connections. Repair as needed.
  4. Visually check all vacuum/boost hoses between solenoid, actuator, and turbo for leaks, kinks, or blockages. Replace defective hoses.
  5. Unplug solenoid and measure coil resistance. If out of expected range or open/shorted, replace solenoid.
  6. Bench-test solenoid with correct voltage/PWM (or use an inline power source) to confirm it actuates and vents/opens as designed.
  7. Verify power and ground at solenoid connector with a multimeter while operating the control circuit. Look for intermittent supply or poor ground.
  8. Check MAP/boost sensor output on the scan tool and with a voltmeter to verify sensor accuracy. Replace or test further if readings are implausible.
  9. Inspect turbo actuator/wastegate linkage for free movement. Manually operate actuator (where safe) to confirm mechanical function and check for binding.
  10. If electrical and mechanical components check OK, inspect PCM outputs for proper PWM using an oscilloscope or known-good scan tool parameter. Consider reflash or ECU replacement only after exhausting wiring/actuator/sensor checks.
  11. After repairs, clear DTCs and re-test under various load conditions to confirm the fault is resolved and boost tracks commanded values.

Likely causes

  • Failed boost control solenoid (common failure point)
  • Broken/grounded PWM control wire to the solenoid
  • Loose or corroded connector at boost solenoid or MAP sensor
  • Vacuum hose disconnected or split between solenoid and actuator
  • MAP/boost sensor sending implausible voltage under load
  • Wastegate actuator linkage disconnected or seized

Fault status

⚠️ Status
P0046 — Turbocharger/Supercharger Boost Control A Circuit Range/Performance. Inspect boost control solenoid, wiring/connector, MAP/boost sensor, vacuum lines and actuator. Verify commanded vs actual boost.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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P0045 P0047 P0299 P0236 P0107
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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