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Home / DTC / P0239 — Turbocharger/Supercharger Boost Sensor B Circuit

P0239 — Turbocharger/Supercharger Boost Sensor B Circuit

Detailed page for trouble code P0239.

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22,491specific
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Code

P0239

Generic P — Powertrain

Turbocharger/Supercharger Boost Sensor B Circuit

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

Causes

  • Open or short in boost sensor B wiring or connector
  • Corroded or loose sensor connector
  • Failed boost (MAP) sensor B
  • Damaged wiring harness from heat or abrasion
  • Short to battery or chassis ground
  • Faulty ECM (rare)

Symptoms

  • Check Engine MIL illuminated
  • Reduced engine power or limp-home mode
  • Poor throttle response, hesitation or surging
  • Higher than normal fuel consumption
  • Erratic boost control or over/under-boost conditions (depending on vehicle strategy)

What to check

  • Read and record freeze frame and live data for boost sensor B and related parameters
  • Compare boost sensor B signal to sensor A (if equipped) while key on and during engine run
  • Visually inspect sensor connector, wiring, and nearby harness for damage, pins pushed out, corrosion or signs of heat
  • Back-probe sensor connector and check reference voltage (typically ~5V) and ground
  • Measure sensor B signal voltage at vacuum, idle and under boost (expect ~0.5–4.5 V depending on pressure)
  • Wiggle test harness while monitoring live data to reproduce fault

Signal parameters

  • Reference voltage: typically ~5 V (key ON, engine OFF)
  • Signal voltage range: ~0.5 V (high vacuum) up to ~4.5 V (high boost) depending on sensor
  • Expected idle/atmospheric pressure: approximate mid-range voltage (often ~1.0–2.5 V)
  • Typical continuity/resistance: wiring harness should show near 0 ohms to ground for ground circuit and ~5 ohms or less for short segments (measure specifics per vehicle)
  • No large voltage spikes or dropouts during throttle changes

Diagnostic algorithm

  1. Connect an OBD-II scanner, read freeze frame and pending/confirmed codes; note related boost/MAP codes.
  2. Perform a visual inspection of sensor B and harness (connector, clips, routing near heat sources).
  3. With ignition ON (engine OFF), back-probe the connector: verify 5V reference, good ground, and that signal pin shows a sensible voltage. If reference or ground missing, trace wiring to fuse/ECM.
  4. Start engine and observe live data for sensor B while varying throttle. Confirm signal moves smoothly and compares reasonably to sensor A (if present).
  5. If signal is stuck high/low or absent, unplug sensor B and check for changes in code/live data. If unplugging causes expected reaction, suspect wiring/sensor.
  6. Perform continuity checks between sensor connector and ECM pins to locate opens or shorts. Check for short to battery (5V) or to ground.
  7. Swap sensor B with sensor A (if identical and wiring connectors allow) to see if code follows the sensor—this helps differentiate sensor vs harness/ECM.
  8. If wiring and sensor check good, inspect ECM connector for damage and consider ECM testing/replacement as last resort.
  9. Repair or replace damaged wiring/connector or replace the boost sensor. Clear codes and road-test to verify repair.
  10. If code returns and wiring/sensor confirmed good, consult manufacturer wiring diagrams and ECM diagnostics; consider professional bench testing or ECM replacement.

Likely causes

  • Broken/crimped wire at connector or bulkhead
  • Water intrusion or corrosion in connector
  • Sensor B internal failure
  • Connector pins pushed out or bent
  • Wiring shorted to 5V reference or ground

Fault status

⚠️ Status
Turbocharger/supercharger boost sensor B circuit malfunction detected — check sensor, connector and wiring for open/short or damage.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0238 P0106 P0107 P0108 P0234 P0299
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Code

P0239

GWM P — Powertrain

- Malfunction of turbocharger sensor B

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

Causes

  • Open or short in boost sensor B wiring or connector
  • Corroded or loose sensor connector
  • Failed boost (MAP) sensor B
  • Damaged wiring harness from heat or abrasion
  • Short to battery or chassis ground
  • Faulty ECM (rare)

Symptoms

  • Check Engine MIL illuminated
  • Reduced engine power or limp-home mode
  • Poor throttle response, hesitation or surging
  • Higher than normal fuel consumption
  • Erratic boost control or over/under-boost conditions (depending on vehicle strategy)

What to check

  • Read and record freeze frame and live data for boost sensor B and related parameters
  • Compare boost sensor B signal to sensor A (if equipped) while key on and during engine run
  • Visually inspect sensor connector, wiring, and nearby harness for damage, pins pushed out, corrosion or signs of heat
  • Back-probe sensor connector and check reference voltage (typically ~5V) and ground
  • Measure sensor B signal voltage at vacuum, idle and under boost (expect ~0.5–4.5 V depending on pressure)
  • Wiggle test harness while monitoring live data to reproduce fault

Signal parameters

  • Reference voltage: typically ~5 V (key ON, engine OFF)
  • Signal voltage range: ~0.5 V (high vacuum) up to ~4.5 V (high boost) depending on sensor
  • Expected idle/atmospheric pressure: approximate mid-range voltage (often ~1.0–2.5 V)
  • Typical continuity/resistance: wiring harness should show near 0 ohms to ground for ground circuit and ~5 ohms or less for short segments (measure specifics per vehicle)
  • No large voltage spikes or dropouts during throttle changes

Diagnostic algorithm

  1. Connect an OBD-II scanner, read freeze frame and pending/confirmed codes; note related boost/MAP codes.
  2. Perform a visual inspection of sensor B and harness (connector, clips, routing near heat sources).
  3. With ignition ON (engine OFF), back-probe the connector: verify 5V reference, good ground, and that signal pin shows a sensible voltage. If reference or ground missing, trace wiring to fuse/ECM.
  4. Start engine and observe live data for sensor B while varying throttle. Confirm signal moves smoothly and compares reasonably to sensor A (if present).
  5. If signal is stuck high/low or absent, unplug sensor B and check for changes in code/live data. If unplugging causes expected reaction, suspect wiring/sensor.
  6. Perform continuity checks between sensor connector and ECM pins to locate opens or shorts. Check for short to battery (5V) or to ground.
  7. Swap sensor B with sensor A (if identical and wiring connectors allow) to see if code follows the sensor—this helps differentiate sensor vs harness/ECM.
  8. If wiring and sensor check good, inspect ECM connector for damage and consider ECM testing/replacement as last resort.
  9. Repair or replace damaged wiring/connector or replace the boost sensor. Clear codes and road-test to verify repair.
  10. If code returns and wiring/sensor confirmed good, consult manufacturer wiring diagrams and ECM diagnostics; consider professional bench testing or ECM replacement.

Likely causes

  • Broken/crimped wire at connector or bulkhead
  • Water intrusion or corrosion in connector
  • Sensor B internal failure
  • Connector pins pushed out or bent
  • Wiring shorted to 5V reference or ground

Fault status

⚠️ Status
Turbocharger/supercharger boost sensor B circuit malfunction detected — check sensor, connector and wiring for open/short or damage.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0238 P0106 P0107 P0108 P0234 P0299
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Code

P0239

HUMMER P — Powertrain

Turbocharger Boost Sensor 2 Circuit

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

Causes

  • Open or short in boost sensor B wiring or connector
  • Corroded or loose sensor connector
  • Failed boost (MAP) sensor B
  • Damaged wiring harness from heat or abrasion
  • Short to battery or chassis ground
  • Faulty ECM (rare)

Symptoms

  • Check Engine MIL illuminated
  • Reduced engine power or limp-home mode
  • Poor throttle response, hesitation or surging
  • Higher than normal fuel consumption
  • Erratic boost control or over/under-boost conditions (depending on vehicle strategy)

What to check

  • Read and record freeze frame and live data for boost sensor B and related parameters
  • Compare boost sensor B signal to sensor A (if equipped) while key on and during engine run
  • Visually inspect sensor connector, wiring, and nearby harness for damage, pins pushed out, corrosion or signs of heat
  • Back-probe sensor connector and check reference voltage (typically ~5V) and ground
  • Measure sensor B signal voltage at vacuum, idle and under boost (expect ~0.5–4.5 V depending on pressure)
  • Wiggle test harness while monitoring live data to reproduce fault

Signal parameters

  • Reference voltage: typically ~5 V (key ON, engine OFF)
  • Signal voltage range: ~0.5 V (high vacuum) up to ~4.5 V (high boost) depending on sensor
  • Expected idle/atmospheric pressure: approximate mid-range voltage (often ~1.0–2.5 V)
  • Typical continuity/resistance: wiring harness should show near 0 ohms to ground for ground circuit and ~5 ohms or less for short segments (measure specifics per vehicle)
  • No large voltage spikes or dropouts during throttle changes

Diagnostic algorithm

  1. Connect an OBD-II scanner, read freeze frame and pending/confirmed codes; note related boost/MAP codes.
  2. Perform a visual inspection of sensor B and harness (connector, clips, routing near heat sources).
  3. With ignition ON (engine OFF), back-probe the connector: verify 5V reference, good ground, and that signal pin shows a sensible voltage. If reference or ground missing, trace wiring to fuse/ECM.
  4. Start engine and observe live data for sensor B while varying throttle. Confirm signal moves smoothly and compares reasonably to sensor A (if present).
  5. If signal is stuck high/low or absent, unplug sensor B and check for changes in code/live data. If unplugging causes expected reaction, suspect wiring/sensor.
  6. Perform continuity checks between sensor connector and ECM pins to locate opens or shorts. Check for short to battery (5V) or to ground.
  7. Swap sensor B with sensor A (if identical and wiring connectors allow) to see if code follows the sensor—this helps differentiate sensor vs harness/ECM.
  8. If wiring and sensor check good, inspect ECM connector for damage and consider ECM testing/replacement as last resort.
  9. Repair or replace damaged wiring/connector or replace the boost sensor. Clear codes and road-test to verify repair.
  10. If code returns and wiring/sensor confirmed good, consult manufacturer wiring diagrams and ECM diagnostics; consider professional bench testing or ECM replacement.

Likely causes

  • Broken/crimped wire at connector or bulkhead
  • Water intrusion or corrosion in connector
  • Sensor B internal failure
  • Connector pins pushed out or bent
  • Wiring shorted to 5V reference or ground

Fault status

⚠️ Status
Turbocharger/supercharger boost sensor B circuit malfunction detected — check sensor, connector and wiring for open/short or damage.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0238 P0106 P0107 P0108 P0234 P0299
Repair manuals

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Code

P0239

LAND ROVER P — Powertrain

Turbocharger/Supercharger Boost Sensor B Circuit

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

Causes

  • Open or short in boost sensor B wiring or connector
  • Corroded or loose sensor connector
  • Failed boost (MAP) sensor B
  • Damaged wiring harness from heat or abrasion
  • Short to battery or chassis ground
  • Faulty ECM (rare)

Symptoms

  • Check Engine MIL illuminated
  • Reduced engine power or limp-home mode
  • Poor throttle response, hesitation or surging
  • Higher than normal fuel consumption
  • Erratic boost control or over/under-boost conditions (depending on vehicle strategy)

What to check

  • Read and record freeze frame and live data for boost sensor B and related parameters
  • Compare boost sensor B signal to sensor A (if equipped) while key on and during engine run
  • Visually inspect sensor connector, wiring, and nearby harness for damage, pins pushed out, corrosion or signs of heat
  • Back-probe sensor connector and check reference voltage (typically ~5V) and ground
  • Measure sensor B signal voltage at vacuum, idle and under boost (expect ~0.5–4.5 V depending on pressure)
  • Wiggle test harness while monitoring live data to reproduce fault

Signal parameters

  • Reference voltage: typically ~5 V (key ON, engine OFF)
  • Signal voltage range: ~0.5 V (high vacuum) up to ~4.5 V (high boost) depending on sensor
  • Expected idle/atmospheric pressure: approximate mid-range voltage (often ~1.0–2.5 V)
  • Typical continuity/resistance: wiring harness should show near 0 ohms to ground for ground circuit and ~5 ohms or less for short segments (measure specifics per vehicle)
  • No large voltage spikes or dropouts during throttle changes

Diagnostic algorithm

  1. Connect an OBD-II scanner, read freeze frame and pending/confirmed codes; note related boost/MAP codes.
  2. Perform a visual inspection of sensor B and harness (connector, clips, routing near heat sources).
  3. With ignition ON (engine OFF), back-probe the connector: verify 5V reference, good ground, and that signal pin shows a sensible voltage. If reference or ground missing, trace wiring to fuse/ECM.
  4. Start engine and observe live data for sensor B while varying throttle. Confirm signal moves smoothly and compares reasonably to sensor A (if present).
  5. If signal is stuck high/low or absent, unplug sensor B and check for changes in code/live data. If unplugging causes expected reaction, suspect wiring/sensor.
  6. Perform continuity checks between sensor connector and ECM pins to locate opens or shorts. Check for short to battery (5V) or to ground.
  7. Swap sensor B with sensor A (if identical and wiring connectors allow) to see if code follows the sensor—this helps differentiate sensor vs harness/ECM.
  8. If wiring and sensor check good, inspect ECM connector for damage and consider ECM testing/replacement as last resort.
  9. Repair or replace damaged wiring/connector or replace the boost sensor. Clear codes and road-test to verify repair.
  10. If code returns and wiring/sensor confirmed good, consult manufacturer wiring diagrams and ECM diagnostics; consider professional bench testing or ECM replacement.

Likely causes

  • Broken/crimped wire at connector or bulkhead
  • Water intrusion or corrosion in connector
  • Sensor B internal failure
  • Connector pins pushed out or bent
  • Wiring shorted to 5V reference or ground

Fault status

⚠️ Status
Turbocharger/supercharger boost sensor B circuit malfunction detected — check sensor, connector and wiring for open/short or damage.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0238 P0106 P0107 P0108 P0234 P0299
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Keep it short and practical. Up to 500 characters.
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