Home / DTC / P0237 — Turbocharger/Supercharger Boost Sensor A Circuit Low

P0237 — Turbocharger/Supercharger Boost Sensor A Circuit Low

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Code

P0237

Generic P — Powertrain

Turbocharger/Supercharger Boost Sensor A Circuit Low

Brand: Generic
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on boost sensor signal wire
  • Failed boost/boost pressure (MAP) sensor
  • Lost 5 V reference or sensor ground
  • Corroded/damaged connector or wiring harness
  • Intermittent connector contact or chafing
  • ECM internal fault (rare)

Symptoms

  • Check Engine Light (MIL) on
  • Reduced engine power, limp mode on some vehicles
  • Poor acceleration or hesitation under boost
  • Erratic boost gauge or incorrect boost readings
  • Possible rough idle if ECM uses MAP for fueling

What to check

  • Read and record freeze frame and live data for boost sensor voltage and engine operating conditions
  • Perform visual inspection of the sensor, connector and wiring harness for damage, corrosion, or disconnection
  • Backprobe sensor connector: verify 5 V reference, sensor ground and signal voltage with key ON and engine running
  • Check continuity of signal wire to ECM and for unintended continuity to ground
  • Wiggle test wiring while monitoring signal for intermittent faults
  • Disconnect sensor and observe ECM reaction (follow manufacturer safe procedures)

Signal parameters

  • Sensor supply/reference: typically +5.0 V (Key ON/Run)
  • Sensor ground: near 0.0 V
  • Signal voltage at idle/no boost: typically ~0.5–2.0 V (varies by vehicle)
  • Signal voltage at boost: rises toward 4–5 V, depending on design and boost level
  • P0237 triggers when signal voltage falls below the manufacturer's low threshold (often close to 0–0.5 V) under expected operating conditions

Diagnostic algorithm

  1. Retrieve freeze-frame data and note engine speed, load, and sensor voltage when code set. Clear codes and attempt to re-create.
  2. Visually inspect sensor, connector, and wiring for physical damage, oil contamination or corrosion. Repair visible damage.
  3. With connector attached, backprobe and measure: verify 5 V reference, good sensor ground (
  4. If signal is low and reference/ground are correct, disconnect the sensor and measure signal at harness end. If signal remains low with sensor disconnected, suspect wiring short to ground or ECM fault.
  5. Check continuity from signal wire to ECM pin and for short to chassis ground. Repair or replace wiring as needed.
  6. If wiring checks OK, bench-test or substitute a known-good sensor and observe signal response (or apply a regulated variable voltage to the signal circuit and verify ECM response per service data).
  7. Inspect turbocharger/vacuum/charge air system for conditions that could produce an expected low reading (heavy boost leak or failed turbo). Confirm mechanical operation if electrical diagnosis is inconclusive.
  8. After repairs or component replacement, clear codes and road-test to verify code does not return. If all wiring and sensor tests pass and problem persists, consider ECM testing/replacement following manufacturer procedures.

Likely causes

  • Signal wire damaged and contacting ground
  • Boost pressure sensor failed or internally shorted
  • Broken or disconnected 5 V reference or ground at sensor
  • Connector pins corroded/pushed out/not seated
  • Harness damage near turbo/intake area

Fault status

⚠️ Status
ECM detected a voltage on the Turbocharger/Supercharger Boost Sensor A signal circuit that is lower than the expected threshold. This indicates an electrical fault (short to ground, missing reference/ground, or failed sensor) or, less commonly, an extreme mechanical condition affecting boost. Further testing required to isolate cause.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P0237

GWM P — Powertrain

- Turbocharger sensor A low

Brand: GWM
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on boost sensor signal wire
  • Failed boost/boost pressure (MAP) sensor
  • Lost 5 V reference or sensor ground
  • Corroded/damaged connector or wiring harness
  • Intermittent connector contact or chafing
  • ECM internal fault (rare)

Symptoms

  • Check Engine Light (MIL) on
  • Reduced engine power, limp mode on some vehicles
  • Poor acceleration or hesitation under boost
  • Erratic boost gauge or incorrect boost readings
  • Possible rough idle if ECM uses MAP for fueling

What to check

  • Read and record freeze frame and live data for boost sensor voltage and engine operating conditions
  • Perform visual inspection of the sensor, connector and wiring harness for damage, corrosion, or disconnection
  • Backprobe sensor connector: verify 5 V reference, sensor ground and signal voltage with key ON and engine running
  • Check continuity of signal wire to ECM and for unintended continuity to ground
  • Wiggle test wiring while monitoring signal for intermittent faults
  • Disconnect sensor and observe ECM reaction (follow manufacturer safe procedures)

Signal parameters

  • Sensor supply/reference: typically +5.0 V (Key ON/Run)
  • Sensor ground: near 0.0 V
  • Signal voltage at idle/no boost: typically ~0.5–2.0 V (varies by vehicle)
  • Signal voltage at boost: rises toward 4–5 V, depending on design and boost level
  • P0237 triggers when signal voltage falls below the manufacturer's low threshold (often close to 0–0.5 V) under expected operating conditions

Diagnostic algorithm

  1. Retrieve freeze-frame data and note engine speed, load, and sensor voltage when code set. Clear codes and attempt to re-create.
  2. Visually inspect sensor, connector, and wiring for physical damage, oil contamination or corrosion. Repair visible damage.
  3. With connector attached, backprobe and measure: verify 5 V reference, good sensor ground (
  4. If signal is low and reference/ground are correct, disconnect the sensor and measure signal at harness end. If signal remains low with sensor disconnected, suspect wiring short to ground or ECM fault.
  5. Check continuity from signal wire to ECM pin and for short to chassis ground. Repair or replace wiring as needed.
  6. If wiring checks OK, bench-test or substitute a known-good sensor and observe signal response (or apply a regulated variable voltage to the signal circuit and verify ECM response per service data).
  7. Inspect turbocharger/vacuum/charge air system for conditions that could produce an expected low reading (heavy boost leak or failed turbo). Confirm mechanical operation if electrical diagnosis is inconclusive.
  8. After repairs or component replacement, clear codes and road-test to verify code does not return. If all wiring and sensor tests pass and problem persists, consider ECM testing/replacement following manufacturer procedures.

Likely causes

  • Signal wire damaged and contacting ground
  • Boost pressure sensor failed or internally shorted
  • Broken or disconnected 5 V reference or ground at sensor
  • Connector pins corroded/pushed out/not seated
  • Harness damage near turbo/intake area

Fault status

⚠️ Status
ECM detected a voltage on the Turbocharger/Supercharger Boost Sensor A signal circuit that is lower than the expected threshold. This indicates an electrical fault (short to ground, missing reference/ground, or failed sensor) or, less commonly, an extreme mechanical condition affecting boost. Further testing required to isolate cause.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P0237

HUMMER P — Powertrain

Turbocharger Boost Sensor Circuit Low Voltage

Brand: HUMMER
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on boost sensor signal wire
  • Failed boost/boost pressure (MAP) sensor
  • Lost 5 V reference or sensor ground
  • Corroded/damaged connector or wiring harness
  • Intermittent connector contact or chafing
  • ECM internal fault (rare)

Symptoms

  • Check Engine Light (MIL) on
  • Reduced engine power, limp mode on some vehicles
  • Poor acceleration or hesitation under boost
  • Erratic boost gauge or incorrect boost readings
  • Possible rough idle if ECM uses MAP for fueling

What to check

  • Read and record freeze frame and live data for boost sensor voltage and engine operating conditions
  • Perform visual inspection of the sensor, connector and wiring harness for damage, corrosion, or disconnection
  • Backprobe sensor connector: verify 5 V reference, sensor ground and signal voltage with key ON and engine running
  • Check continuity of signal wire to ECM and for unintended continuity to ground
  • Wiggle test wiring while monitoring signal for intermittent faults
  • Disconnect sensor and observe ECM reaction (follow manufacturer safe procedures)

Signal parameters

  • Sensor supply/reference: typically +5.0 V (Key ON/Run)
  • Sensor ground: near 0.0 V
  • Signal voltage at idle/no boost: typically ~0.5–2.0 V (varies by vehicle)
  • Signal voltage at boost: rises toward 4–5 V, depending on design and boost level
  • P0237 triggers when signal voltage falls below the manufacturer's low threshold (often close to 0–0.5 V) under expected operating conditions

Diagnostic algorithm

  1. Retrieve freeze-frame data and note engine speed, load, and sensor voltage when code set. Clear codes and attempt to re-create.
  2. Visually inspect sensor, connector, and wiring for physical damage, oil contamination or corrosion. Repair visible damage.
  3. With connector attached, backprobe and measure: verify 5 V reference, good sensor ground (
  4. If signal is low and reference/ground are correct, disconnect the sensor and measure signal at harness end. If signal remains low with sensor disconnected, suspect wiring short to ground or ECM fault.
  5. Check continuity from signal wire to ECM pin and for short to chassis ground. Repair or replace wiring as needed.
  6. If wiring checks OK, bench-test or substitute a known-good sensor and observe signal response (or apply a regulated variable voltage to the signal circuit and verify ECM response per service data).
  7. Inspect turbocharger/vacuum/charge air system for conditions that could produce an expected low reading (heavy boost leak or failed turbo). Confirm mechanical operation if electrical diagnosis is inconclusive.
  8. After repairs or component replacement, clear codes and road-test to verify code does not return. If all wiring and sensor tests pass and problem persists, consider ECM testing/replacement following manufacturer procedures.

Likely causes

  • Signal wire damaged and contacting ground
  • Boost pressure sensor failed or internally shorted
  • Broken or disconnected 5 V reference or ground at sensor
  • Connector pins corroded/pushed out/not seated
  • Harness damage near turbo/intake area

Fault status

⚠️ Status
ECM detected a voltage on the Turbocharger/Supercharger Boost Sensor A signal circuit that is lower than the expected threshold. This indicates an electrical fault (short to ground, missing reference/ground, or failed sensor) or, less commonly, an extreme mechanical condition affecting boost. Further testing required to isolate cause.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Manual library for HUMMER

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Code

P0237

ISUZU P — Powertrain

Turbo Charger Boost Sensor Circuit Low

Brand: ISUZU
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on boost sensor signal wire
  • Failed boost/boost pressure (MAP) sensor
  • Lost 5 V reference or sensor ground
  • Corroded/damaged connector or wiring harness
  • Intermittent connector contact or chafing
  • ECM internal fault (rare)

Symptoms

  • Check Engine Light (MIL) on
  • Reduced engine power, limp mode on some vehicles
  • Poor acceleration or hesitation under boost
  • Erratic boost gauge or incorrect boost readings
  • Possible rough idle if ECM uses MAP for fueling

What to check

  • Read and record freeze frame and live data for boost sensor voltage and engine operating conditions
  • Perform visual inspection of the sensor, connector and wiring harness for damage, corrosion, or disconnection
  • Backprobe sensor connector: verify 5 V reference, sensor ground and signal voltage with key ON and engine running
  • Check continuity of signal wire to ECM and for unintended continuity to ground
  • Wiggle test wiring while monitoring signal for intermittent faults
  • Disconnect sensor and observe ECM reaction (follow manufacturer safe procedures)

Signal parameters

  • Sensor supply/reference: typically +5.0 V (Key ON/Run)
  • Sensor ground: near 0.0 V
  • Signal voltage at idle/no boost: typically ~0.5–2.0 V (varies by vehicle)
  • Signal voltage at boost: rises toward 4–5 V, depending on design and boost level
  • P0237 triggers when signal voltage falls below the manufacturer's low threshold (often close to 0–0.5 V) under expected operating conditions

Diagnostic algorithm

  1. Retrieve freeze-frame data and note engine speed, load, and sensor voltage when code set. Clear codes and attempt to re-create.
  2. Visually inspect sensor, connector, and wiring for physical damage, oil contamination or corrosion. Repair visible damage.
  3. With connector attached, backprobe and measure: verify 5 V reference, good sensor ground (
  4. If signal is low and reference/ground are correct, disconnect the sensor and measure signal at harness end. If signal remains low with sensor disconnected, suspect wiring short to ground or ECM fault.
  5. Check continuity from signal wire to ECM pin and for short to chassis ground. Repair or replace wiring as needed.
  6. If wiring checks OK, bench-test or substitute a known-good sensor and observe signal response (or apply a regulated variable voltage to the signal circuit and verify ECM response per service data).
  7. Inspect turbocharger/vacuum/charge air system for conditions that could produce an expected low reading (heavy boost leak or failed turbo). Confirm mechanical operation if electrical diagnosis is inconclusive.
  8. After repairs or component replacement, clear codes and road-test to verify code does not return. If all wiring and sensor tests pass and problem persists, consider ECM testing/replacement following manufacturer procedures.

Likely causes

  • Signal wire damaged and contacting ground
  • Boost pressure sensor failed or internally shorted
  • Broken or disconnected 5 V reference or ground at sensor
  • Connector pins corroded/pushed out/not seated
  • Harness damage near turbo/intake area

Fault status

⚠️ Status
ECM detected a voltage on the Turbocharger/Supercharger Boost Sensor A signal circuit that is lower than the expected threshold. This indicates an electrical fault (short to ground, missing reference/ground, or failed sensor) or, less commonly, an extreme mechanical condition affecting boost. Further testing required to isolate cause.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Repair manuals

Manual library for ISUZU

86

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+100 karma for a short comment :)
Send to email
Code

P0237

LAND ROVER P — Powertrain

Turbocharger Boost Sensor A - Low Circuit

AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on boost sensor signal wire
  • Failed boost/boost pressure (MAP) sensor
  • Lost 5 V reference or sensor ground
  • Corroded/damaged connector or wiring harness
  • Intermittent connector contact or chafing
  • ECM internal fault (rare)

Symptoms

  • Check Engine Light (MIL) on
  • Reduced engine power, limp mode on some vehicles
  • Poor acceleration or hesitation under boost
  • Erratic boost gauge or incorrect boost readings
  • Possible rough idle if ECM uses MAP for fueling

What to check

  • Read and record freeze frame and live data for boost sensor voltage and engine operating conditions
  • Perform visual inspection of the sensor, connector and wiring harness for damage, corrosion, or disconnection
  • Backprobe sensor connector: verify 5 V reference, sensor ground and signal voltage with key ON and engine running
  • Check continuity of signal wire to ECM and for unintended continuity to ground
  • Wiggle test wiring while monitoring signal for intermittent faults
  • Disconnect sensor and observe ECM reaction (follow manufacturer safe procedures)

Signal parameters

  • Sensor supply/reference: typically +5.0 V (Key ON/Run)
  • Sensor ground: near 0.0 V
  • Signal voltage at idle/no boost: typically ~0.5–2.0 V (varies by vehicle)
  • Signal voltage at boost: rises toward 4–5 V, depending on design and boost level
  • P0237 triggers when signal voltage falls below the manufacturer's low threshold (often close to 0–0.5 V) under expected operating conditions

Diagnostic algorithm

  1. Retrieve freeze-frame data and note engine speed, load, and sensor voltage when code set. Clear codes and attempt to re-create.
  2. Visually inspect sensor, connector, and wiring for physical damage, oil contamination or corrosion. Repair visible damage.
  3. With connector attached, backprobe and measure: verify 5 V reference, good sensor ground (
  4. If signal is low and reference/ground are correct, disconnect the sensor and measure signal at harness end. If signal remains low with sensor disconnected, suspect wiring short to ground or ECM fault.
  5. Check continuity from signal wire to ECM pin and for short to chassis ground. Repair or replace wiring as needed.
  6. If wiring checks OK, bench-test or substitute a known-good sensor and observe signal response (or apply a regulated variable voltage to the signal circuit and verify ECM response per service data).
  7. Inspect turbocharger/vacuum/charge air system for conditions that could produce an expected low reading (heavy boost leak or failed turbo). Confirm mechanical operation if electrical diagnosis is inconclusive.
  8. After repairs or component replacement, clear codes and road-test to verify code does not return. If all wiring and sensor tests pass and problem persists, consider ECM testing/replacement following manufacturer procedures.

Likely causes

  • Signal wire damaged and contacting ground
  • Boost pressure sensor failed or internally shorted
  • Broken or disconnected 5 V reference or ground at sensor
  • Connector pins corroded/pushed out/not seated
  • Harness damage near turbo/intake area

Fault status

⚠️ Status
ECM detected a voltage on the Turbocharger/Supercharger Boost Sensor A signal circuit that is lower than the expected threshold. This indicates an electrical fault (short to ground, missing reference/ground, or failed sensor) or, less commonly, an extreme mechanical condition affecting boost. Further testing required to isolate cause.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

320

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LAND ROVER

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