Code
P0237
Generic
P — Powertrain
Turbocharger/Supercharger Boost Sensor A Circuit Low
Views:
UK: 15
EN: 22
RU: 68
AI status
Completed
Completed
100%
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
- Retrieve freeze-frame data and note engine speed, load, and sensor voltage when code set. Clear codes and attempt to re-create.
- Visually inspect sensor, connector, and wiring for physical damage, oil contamination or corrosion. Repair visible damage.
- With connector attached, backprobe and measure: verify 5 V reference, good sensor ground (
- 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.
- Check continuity from signal wire to ECM pin and for short to chassis ground. Repair or replace wiring as needed.
- 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).
- 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.
- 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
Views:
UK: 1
EN: 8
RU: 19
AI status
Completed
Completed
100%
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
- Retrieve freeze-frame data and note engine speed, load, and sensor voltage when code set. Clear codes and attempt to re-create.
- Visually inspect sensor, connector, and wiring for physical damage, oil contamination or corrosion. Repair visible damage.
- With connector attached, backprobe and measure: verify 5 V reference, good sensor ground (
- 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.
- Check continuity from signal wire to ECM pin and for short to chassis ground. Repair or replace wiring as needed.
- 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).
- 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.
- 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
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Code
P0237
HUMMER
P — Powertrain
Turbocharger Boost Sensor Circuit Low Voltage
Views:
UK: 7
EN: 18
RU: 50
AI status
Completed
Completed
100%
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
- Retrieve freeze-frame data and note engine speed, load, and sensor voltage when code set. Clear codes and attempt to re-create.
- Visually inspect sensor, connector, and wiring for physical damage, oil contamination or corrosion. Repair visible damage.
- With connector attached, backprobe and measure: verify 5 V reference, good sensor ground (
- 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.
- Check continuity from signal wire to ECM pin and for short to chassis ground. Repair or replace wiring as needed.
- 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).
- 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.
- 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
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Code
P0237
ISUZU
P — Powertrain
Turbo Charger Boost Sensor Circuit Low
Views:
UK: 13
EN: 23
RU: 59
AI status
Completed
Completed
100%
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
- Retrieve freeze-frame data and note engine speed, load, and sensor voltage when code set. Clear codes and attempt to re-create.
- Visually inspect sensor, connector, and wiring for physical damage, oil contamination or corrosion. Repair visible damage.
- With connector attached, backprobe and measure: verify 5 V reference, good sensor ground (
- 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.
- Check continuity from signal wire to ECM pin and for short to chassis ground. Repair or replace wiring as needed.
- 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).
- 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.
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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0
Send to email
Code
P0237
LAND ROVER
P — Powertrain
Turbocharger Boost Sensor A - Low Circuit
Views:
UK: 4
EN: 10
RU: 44
AI status
Completed
Completed
100%
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
- Retrieve freeze-frame data and note engine speed, load, and sensor voltage when code set. Clear codes and attempt to re-create.
- Visually inspect sensor, connector, and wiring for physical damage, oil contamination or corrosion. Repair visible damage.
- With connector attached, backprobe and measure: verify 5 V reference, good sensor ground (
- 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.
- Check continuity from signal wire to ECM pin and for short to chassis ground. Repair or replace wiring as needed.
- 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).
- 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.
- 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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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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