Code
P1184
CITROEN
P — Powertrain
Vacuum monitoring short circuit to positive
Views:
UK: 2
EN: 10
RU: 5
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (insulation chafed/shorted to battery positive)
- Corroded or loose connector pins allowing a positive feed to the signal circuit
- Faulty vacuum/pressure sensor with internal short to supply
- Aftermarket electrical work or repairs creating a direct short to battery positive
- Blown fuse or incorrect fuse routing that applies battery voltage to the sensor line
- PCM/input module internal fault or damaged pin shorted to battery rail
Symptoms
- Malfunction indicator lamp (MIL) / Check Engine light illuminated
- Possible engine running abnormalities (rough idle, hesitation, reduced power) if vacuum feedback used for fuel/air control
- Poor fuel economy or rich/lean running depending on system mapping
- Stored or intermittent drivability faults under certain conditions
- Possible related system warnings if vacuum used by brake assist or turbo control (vehicle dependent)
What to check
- Read freeze-frame and live data with a scan tool to confirm conditions when DTC set
- Verify battery voltage and ground integrity
- Visually inspect vacuum sensor connector and wiring along full harness route for damage, pin corrosion, or melted insulation
- Backprobe sensor signal, sensor supply (5 V or reference) and ground with ignition ON (engine OFF) and while cranking/running where safe
- Check for aftermarket accessories or recent repairs tapping into wiring near the sensor
- Inspect fuses and relays associated with sensor power/reference circuits
Signal parameters
- Expected reference supply: typically 5 V (vehicle dependent)
- Expected signal range: typically ~0.5–4.5 V for vacuum/pressure sensors (varies by sensor)
- Short-to-positive symptom: signal voltage near reference or battery voltage (≈5 V reference or higher if directly tied to battery)
- Short-to-ground symptom (contrast): signal near 0 V
Diagnostic algorithm
- Retrieve full DTC list and freeze-frame data with a scan tool; note conditions (ignition, engine speed, temperature)
- Visually inspect sensor, connector and wiring for damage, corrosion or signs of overheating
- With ignition ON (engine OFF) backprobe the sensor connector: measure reference voltage, signal voltage and ground. Record values.
- If signal reads high (near reference/battery), disconnect the sensor and re-measure the signal at the harness connector with connector disconnected. If voltage falls to expected open-circuit level or 0 V, suspect sensor short.
- If harness still shows high voltage with sensor disconnected, trace wiring toward fuse box/PCM looking for short to battery (inspect splice points, relays, accessory taps)
- If high voltage disappears when disconnecting PCM harness, suspect PCM or module with internal short — verify grounds and connections then consider module bench test or replacement per manufacturer guidance
- If wiring appears intact but intermittent, perform wiggle testing while monitoring live data to reproduce fault
- After repairs, clear codes and perform drive cycle to verify DTC does not return
Likely causes
- Wiring short to battery (+) between sensor and PCM
- Contaminated/corroded connector allowing intermittent high voltage on the signal wire
- Failed vacuum sensor (internal short to Vbatt or 5V reference)
- Incorrectly installed replacement sensor or harness
Fault status
Status
P1184 — Vacuum monitoring circuit: short to positive detected (signal too high). Inspect sensor, wiring and connectors for short to battery.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1184
DAEWOO
P — Powertrain
O2S (B1/S2) NO SIGNAL
Views:
UK: 3
EN: 15
RU: 7
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (insulation chafed/shorted to battery positive)
- Corroded or loose connector pins allowing a positive feed to the signal circuit
- Faulty vacuum/pressure sensor with internal short to supply
- Aftermarket electrical work or repairs creating a direct short to battery positive
- Blown fuse or incorrect fuse routing that applies battery voltage to the sensor line
- PCM/input module internal fault or damaged pin shorted to battery rail
Symptoms
- Malfunction indicator lamp (MIL) / Check Engine light illuminated
- Possible engine running abnormalities (rough idle, hesitation, reduced power) if vacuum feedback used for fuel/air control
- Poor fuel economy or rich/lean running depending on system mapping
- Stored or intermittent drivability faults under certain conditions
- Possible related system warnings if vacuum used by brake assist or turbo control (vehicle dependent)
What to check
- Read freeze-frame and live data with a scan tool to confirm conditions when DTC set
- Verify battery voltage and ground integrity
- Visually inspect vacuum sensor connector and wiring along full harness route for damage, pin corrosion, or melted insulation
- Backprobe sensor signal, sensor supply (5 V or reference) and ground with ignition ON (engine OFF) and while cranking/running where safe
- Check for aftermarket accessories or recent repairs tapping into wiring near the sensor
- Inspect fuses and relays associated with sensor power/reference circuits
Signal parameters
- Expected reference supply: typically 5 V (vehicle dependent)
- Expected signal range: typically ~0.5–4.5 V for vacuum/pressure sensors (varies by sensor)
- Short-to-positive symptom: signal voltage near reference or battery voltage (≈5 V reference or higher if directly tied to battery)
- Short-to-ground symptom (contrast): signal near 0 V
Diagnostic algorithm
- Retrieve full DTC list and freeze-frame data with a scan tool; note conditions (ignition, engine speed, temperature)
- Visually inspect sensor, connector and wiring for damage, corrosion or signs of overheating
- With ignition ON (engine OFF) backprobe the sensor connector: measure reference voltage, signal voltage and ground. Record values.
- If signal reads high (near reference/battery), disconnect the sensor and re-measure the signal at the harness connector with connector disconnected. If voltage falls to expected open-circuit level or 0 V, suspect sensor short.
- If harness still shows high voltage with sensor disconnected, trace wiring toward fuse box/PCM looking for short to battery (inspect splice points, relays, accessory taps)
- If high voltage disappears when disconnecting PCM harness, suspect PCM or module with internal short — verify grounds and connections then consider module bench test or replacement per manufacturer guidance
- If wiring appears intact but intermittent, perform wiggle testing while monitoring live data to reproduce fault
- After repairs, clear codes and perform drive cycle to verify DTC does not return
Likely causes
- Wiring short to battery (+) between sensor and PCM
- Contaminated/corroded connector allowing intermittent high voltage on the signal wire
- Failed vacuum sensor (internal short to Vbatt or 5V reference)
- Incorrectly installed replacement sensor or harness
Fault status
Status
P1184 — Vacuum monitoring circuit: short to positive detected (signal too high). Inspect sensor, wiring and connectors for short to battery.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1184
DS
P — Powertrain
Vacuum monitoring short circuit to positive
Views:
UK: 2
EN: 7
RU: 4
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (insulation chafed/shorted to battery positive)
- Corroded or loose connector pins allowing a positive feed to the signal circuit
- Faulty vacuum/pressure sensor with internal short to supply
- Aftermarket electrical work or repairs creating a direct short to battery positive
- Blown fuse or incorrect fuse routing that applies battery voltage to the sensor line
- PCM/input module internal fault or damaged pin shorted to battery rail
Symptoms
- Malfunction indicator lamp (MIL) / Check Engine light illuminated
- Possible engine running abnormalities (rough idle, hesitation, reduced power) if vacuum feedback used for fuel/air control
- Poor fuel economy or rich/lean running depending on system mapping
- Stored or intermittent drivability faults under certain conditions
- Possible related system warnings if vacuum used by brake assist or turbo control (vehicle dependent)
What to check
- Read freeze-frame and live data with a scan tool to confirm conditions when DTC set
- Verify battery voltage and ground integrity
- Visually inspect vacuum sensor connector and wiring along full harness route for damage, pin corrosion, or melted insulation
- Backprobe sensor signal, sensor supply (5 V or reference) and ground with ignition ON (engine OFF) and while cranking/running where safe
- Check for aftermarket accessories or recent repairs tapping into wiring near the sensor
- Inspect fuses and relays associated with sensor power/reference circuits
Signal parameters
- Expected reference supply: typically 5 V (vehicle dependent)
- Expected signal range: typically ~0.5–4.5 V for vacuum/pressure sensors (varies by sensor)
- Short-to-positive symptom: signal voltage near reference or battery voltage (≈5 V reference or higher if directly tied to battery)
- Short-to-ground symptom (contrast): signal near 0 V
Diagnostic algorithm
- Retrieve full DTC list and freeze-frame data with a scan tool; note conditions (ignition, engine speed, temperature)
- Visually inspect sensor, connector and wiring for damage, corrosion or signs of overheating
- With ignition ON (engine OFF) backprobe the sensor connector: measure reference voltage, signal voltage and ground. Record values.
- If signal reads high (near reference/battery), disconnect the sensor and re-measure the signal at the harness connector with connector disconnected. If voltage falls to expected open-circuit level or 0 V, suspect sensor short.
- If harness still shows high voltage with sensor disconnected, trace wiring toward fuse box/PCM looking for short to battery (inspect splice points, relays, accessory taps)
- If high voltage disappears when disconnecting PCM harness, suspect PCM or module with internal short — verify grounds and connections then consider module bench test or replacement per manufacturer guidance
- If wiring appears intact but intermittent, perform wiggle testing while monitoring live data to reproduce fault
- After repairs, clear codes and perform drive cycle to verify DTC does not return
Likely causes
- Wiring short to battery (+) between sensor and PCM
- Contaminated/corroded connector allowing intermittent high voltage on the signal wire
- Failed vacuum sensor (internal short to Vbatt or 5V reference)
- Incorrectly installed replacement sensor or harness
Fault status
Status
P1184 — Vacuum monitoring circuit: short to positive detected (signal too high). Inspect sensor, wiring and connectors for short to battery.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1184
FORD
P — Powertrain
Engine Oil Temperature Out Of Self Test Range
Views:
UK: 25
EN: 34
RU: 20
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (insulation chafed/shorted to battery positive)
- Corroded or loose connector pins allowing a positive feed to the signal circuit
- Faulty vacuum/pressure sensor with internal short to supply
- Aftermarket electrical work or repairs creating a direct short to battery positive
- Blown fuse or incorrect fuse routing that applies battery voltage to the sensor line
- PCM/input module internal fault or damaged pin shorted to battery rail
Symptoms
- Malfunction indicator lamp (MIL) / Check Engine light illuminated
- Possible engine running abnormalities (rough idle, hesitation, reduced power) if vacuum feedback used for fuel/air control
- Poor fuel economy or rich/lean running depending on system mapping
- Stored or intermittent drivability faults under certain conditions
- Possible related system warnings if vacuum used by brake assist or turbo control (vehicle dependent)
What to check
- Read freeze-frame and live data with a scan tool to confirm conditions when DTC set
- Verify battery voltage and ground integrity
- Visually inspect vacuum sensor connector and wiring along full harness route for damage, pin corrosion, or melted insulation
- Backprobe sensor signal, sensor supply (5 V or reference) and ground with ignition ON (engine OFF) and while cranking/running where safe
- Check for aftermarket accessories or recent repairs tapping into wiring near the sensor
- Inspect fuses and relays associated with sensor power/reference circuits
Signal parameters
- Expected reference supply: typically 5 V (vehicle dependent)
- Expected signal range: typically ~0.5–4.5 V for vacuum/pressure sensors (varies by sensor)
- Short-to-positive symptom: signal voltage near reference or battery voltage (≈5 V reference or higher if directly tied to battery)
- Short-to-ground symptom (contrast): signal near 0 V
Diagnostic algorithm
- Retrieve full DTC list and freeze-frame data with a scan tool; note conditions (ignition, engine speed, temperature)
- Visually inspect sensor, connector and wiring for damage, corrosion or signs of overheating
- With ignition ON (engine OFF) backprobe the sensor connector: measure reference voltage, signal voltage and ground. Record values.
- If signal reads high (near reference/battery), disconnect the sensor and re-measure the signal at the harness connector with connector disconnected. If voltage falls to expected open-circuit level or 0 V, suspect sensor short.
- If harness still shows high voltage with sensor disconnected, trace wiring toward fuse box/PCM looking for short to battery (inspect splice points, relays, accessory taps)
- If high voltage disappears when disconnecting PCM harness, suspect PCM or module with internal short — verify grounds and connections then consider module bench test or replacement per manufacturer guidance
- If wiring appears intact but intermittent, perform wiggle testing while monitoring live data to reproduce fault
- After repairs, clear codes and perform drive cycle to verify DTC does not return
Likely causes
- Wiring short to battery (+) between sensor and PCM
- Contaminated/corroded connector allowing intermittent high voltage on the signal wire
- Failed vacuum sensor (internal short to Vbatt or 5V reference)
- Incorrectly installed replacement sensor or harness
Fault status
Status
P1184 — Vacuum monitoring circuit: short to positive detected (signal too high). Inspect sensor, wiring and connectors for short to battery.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1184
LAND ROVER
P — Powertrain
Engine oil temperature sensor out of test range
Views:
UK: 3
EN: 15
RU: 9
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (insulation chafed/shorted to battery positive)
- Corroded or loose connector pins allowing a positive feed to the signal circuit
- Faulty vacuum/pressure sensor with internal short to supply
- Aftermarket electrical work or repairs creating a direct short to battery positive
- Blown fuse or incorrect fuse routing that applies battery voltage to the sensor line
- PCM/input module internal fault or damaged pin shorted to battery rail
Symptoms
- Malfunction indicator lamp (MIL) / Check Engine light illuminated
- Possible engine running abnormalities (rough idle, hesitation, reduced power) if vacuum feedback used for fuel/air control
- Poor fuel economy or rich/lean running depending on system mapping
- Stored or intermittent drivability faults under certain conditions
- Possible related system warnings if vacuum used by brake assist or turbo control (vehicle dependent)
What to check
- Read freeze-frame and live data with a scan tool to confirm conditions when DTC set
- Verify battery voltage and ground integrity
- Visually inspect vacuum sensor connector and wiring along full harness route for damage, pin corrosion, or melted insulation
- Backprobe sensor signal, sensor supply (5 V or reference) and ground with ignition ON (engine OFF) and while cranking/running where safe
- Check for aftermarket accessories or recent repairs tapping into wiring near the sensor
- Inspect fuses and relays associated with sensor power/reference circuits
Signal parameters
- Expected reference supply: typically 5 V (vehicle dependent)
- Expected signal range: typically ~0.5–4.5 V for vacuum/pressure sensors (varies by sensor)
- Short-to-positive symptom: signal voltage near reference or battery voltage (≈5 V reference or higher if directly tied to battery)
- Short-to-ground symptom (contrast): signal near 0 V
Diagnostic algorithm
- Retrieve full DTC list and freeze-frame data with a scan tool; note conditions (ignition, engine speed, temperature)
- Visually inspect sensor, connector and wiring for damage, corrosion or signs of overheating
- With ignition ON (engine OFF) backprobe the sensor connector: measure reference voltage, signal voltage and ground. Record values.
- If signal reads high (near reference/battery), disconnect the sensor and re-measure the signal at the harness connector with connector disconnected. If voltage falls to expected open-circuit level or 0 V, suspect sensor short.
- If harness still shows high voltage with sensor disconnected, trace wiring toward fuse box/PCM looking for short to battery (inspect splice points, relays, accessory taps)
- If high voltage disappears when disconnecting PCM harness, suspect PCM or module with internal short — verify grounds and connections then consider module bench test or replacement per manufacturer guidance
- If wiring appears intact but intermittent, perform wiggle testing while monitoring live data to reproduce fault
- After repairs, clear codes and perform drive cycle to verify DTC does not return
Likely causes
- Wiring short to battery (+) between sensor and PCM
- Contaminated/corroded connector allowing intermittent high voltage on the signal wire
- Failed vacuum sensor (internal short to Vbatt or 5V reference)
- Incorrectly installed replacement sensor or harness
Fault status
Status
P1184 — Vacuum monitoring circuit: short to positive detected (signal too high). Inspect sensor, wiring and connectors for short to battery.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
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Code
P1184
LINCOLN
P — Powertrain
Engine Oil Temperature Out Of Self Test Range
Views:
UK: 25
EN: 47
RU: 21
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (insulation chafed/shorted to battery positive)
- Corroded or loose connector pins allowing a positive feed to the signal circuit
- Faulty vacuum/pressure sensor with internal short to supply
- Aftermarket electrical work or repairs creating a direct short to battery positive
- Blown fuse or incorrect fuse routing that applies battery voltage to the sensor line
- PCM/input module internal fault or damaged pin shorted to battery rail
Symptoms
- Malfunction indicator lamp (MIL) / Check Engine light illuminated
- Possible engine running abnormalities (rough idle, hesitation, reduced power) if vacuum feedback used for fuel/air control
- Poor fuel economy or rich/lean running depending on system mapping
- Stored or intermittent drivability faults under certain conditions
- Possible related system warnings if vacuum used by brake assist or turbo control (vehicle dependent)
What to check
- Read freeze-frame and live data with a scan tool to confirm conditions when DTC set
- Verify battery voltage and ground integrity
- Visually inspect vacuum sensor connector and wiring along full harness route for damage, pin corrosion, or melted insulation
- Backprobe sensor signal, sensor supply (5 V or reference) and ground with ignition ON (engine OFF) and while cranking/running where safe
- Check for aftermarket accessories or recent repairs tapping into wiring near the sensor
- Inspect fuses and relays associated with sensor power/reference circuits
Signal parameters
- Expected reference supply: typically 5 V (vehicle dependent)
- Expected signal range: typically ~0.5–4.5 V for vacuum/pressure sensors (varies by sensor)
- Short-to-positive symptom: signal voltage near reference or battery voltage (≈5 V reference or higher if directly tied to battery)
- Short-to-ground symptom (contrast): signal near 0 V
Diagnostic algorithm
- Retrieve full DTC list and freeze-frame data with a scan tool; note conditions (ignition, engine speed, temperature)
- Visually inspect sensor, connector and wiring for damage, corrosion or signs of overheating
- With ignition ON (engine OFF) backprobe the sensor connector: measure reference voltage, signal voltage and ground. Record values.
- If signal reads high (near reference/battery), disconnect the sensor and re-measure the signal at the harness connector with connector disconnected. If voltage falls to expected open-circuit level or 0 V, suspect sensor short.
- If harness still shows high voltage with sensor disconnected, trace wiring toward fuse box/PCM looking for short to battery (inspect splice points, relays, accessory taps)
- If high voltage disappears when disconnecting PCM harness, suspect PCM or module with internal short — verify grounds and connections then consider module bench test or replacement per manufacturer guidance
- If wiring appears intact but intermittent, perform wiggle testing while monitoring live data to reproduce fault
- After repairs, clear codes and perform drive cycle to verify DTC does not return
Likely causes
- Wiring short to battery (+) between sensor and PCM
- Contaminated/corroded connector allowing intermittent high voltage on the signal wire
- Failed vacuum sensor (internal short to Vbatt or 5V reference)
- Incorrectly installed replacement sensor or harness
Fault status
Status
P1184 — Vacuum monitoring circuit: short to positive detected (signal too high). Inspect sensor, wiring and connectors for short to battery.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1184
MERCURY
P — Powertrain
Engine Oil Temperature Out Of Self Test Range
Views:
UK: 28
EN: 58
RU: 21
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (insulation chafed/shorted to battery positive)
- Corroded or loose connector pins allowing a positive feed to the signal circuit
- Faulty vacuum/pressure sensor with internal short to supply
- Aftermarket electrical work or repairs creating a direct short to battery positive
- Blown fuse or incorrect fuse routing that applies battery voltage to the sensor line
- PCM/input module internal fault or damaged pin shorted to battery rail
Symptoms
- Malfunction indicator lamp (MIL) / Check Engine light illuminated
- Possible engine running abnormalities (rough idle, hesitation, reduced power) if vacuum feedback used for fuel/air control
- Poor fuel economy or rich/lean running depending on system mapping
- Stored or intermittent drivability faults under certain conditions
- Possible related system warnings if vacuum used by brake assist or turbo control (vehicle dependent)
What to check
- Read freeze-frame and live data with a scan tool to confirm conditions when DTC set
- Verify battery voltage and ground integrity
- Visually inspect vacuum sensor connector and wiring along full harness route for damage, pin corrosion, or melted insulation
- Backprobe sensor signal, sensor supply (5 V or reference) and ground with ignition ON (engine OFF) and while cranking/running where safe
- Check for aftermarket accessories or recent repairs tapping into wiring near the sensor
- Inspect fuses and relays associated with sensor power/reference circuits
Signal parameters
- Expected reference supply: typically 5 V (vehicle dependent)
- Expected signal range: typically ~0.5–4.5 V for vacuum/pressure sensors (varies by sensor)
- Short-to-positive symptom: signal voltage near reference or battery voltage (≈5 V reference or higher if directly tied to battery)
- Short-to-ground symptom (contrast): signal near 0 V
Diagnostic algorithm
- Retrieve full DTC list and freeze-frame data with a scan tool; note conditions (ignition, engine speed, temperature)
- Visually inspect sensor, connector and wiring for damage, corrosion or signs of overheating
- With ignition ON (engine OFF) backprobe the sensor connector: measure reference voltage, signal voltage and ground. Record values.
- If signal reads high (near reference/battery), disconnect the sensor and re-measure the signal at the harness connector with connector disconnected. If voltage falls to expected open-circuit level or 0 V, suspect sensor short.
- If harness still shows high voltage with sensor disconnected, trace wiring toward fuse box/PCM looking for short to battery (inspect splice points, relays, accessory taps)
- If high voltage disappears when disconnecting PCM harness, suspect PCM or module with internal short — verify grounds and connections then consider module bench test or replacement per manufacturer guidance
- If wiring appears intact but intermittent, perform wiggle testing while monitoring live data to reproduce fault
- After repairs, clear codes and perform drive cycle to verify DTC does not return
Likely causes
- Wiring short to battery (+) between sensor and PCM
- Contaminated/corroded connector allowing intermittent high voltage on the signal wire
- Failed vacuum sensor (internal short to Vbatt or 5V reference)
- Incorrectly installed replacement sensor or harness
Fault status
Status
P1184 — Vacuum monitoring circuit: short to positive detected (signal too high). Inspect sensor, wiring and connectors for short to battery.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1184
Other
P — Powertrain
Engine Oil Temperature Out Of Self Test Range
Views:
UK: 23
EN: 33
RU: 17
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (insulation chafed/shorted to battery positive)
- Corroded or loose connector pins allowing a positive feed to the signal circuit
- Faulty vacuum/pressure sensor with internal short to supply
- Aftermarket electrical work or repairs creating a direct short to battery positive
- Blown fuse or incorrect fuse routing that applies battery voltage to the sensor line
- PCM/input module internal fault or damaged pin shorted to battery rail
Symptoms
- Malfunction indicator lamp (MIL) / Check Engine light illuminated
- Possible engine running abnormalities (rough idle, hesitation, reduced power) if vacuum feedback used for fuel/air control
- Poor fuel economy or rich/lean running depending on system mapping
- Stored or intermittent drivability faults under certain conditions
- Possible related system warnings if vacuum used by brake assist or turbo control (vehicle dependent)
What to check
- Read freeze-frame and live data with a scan tool to confirm conditions when DTC set
- Verify battery voltage and ground integrity
- Visually inspect vacuum sensor connector and wiring along full harness route for damage, pin corrosion, or melted insulation
- Backprobe sensor signal, sensor supply (5 V or reference) and ground with ignition ON (engine OFF) and while cranking/running where safe
- Check for aftermarket accessories or recent repairs tapping into wiring near the sensor
- Inspect fuses and relays associated with sensor power/reference circuits
Signal parameters
- Expected reference supply: typically 5 V (vehicle dependent)
- Expected signal range: typically ~0.5–4.5 V for vacuum/pressure sensors (varies by sensor)
- Short-to-positive symptom: signal voltage near reference or battery voltage (≈5 V reference or higher if directly tied to battery)
- Short-to-ground symptom (contrast): signal near 0 V
Diagnostic algorithm
- Retrieve full DTC list and freeze-frame data with a scan tool; note conditions (ignition, engine speed, temperature)
- Visually inspect sensor, connector and wiring for damage, corrosion or signs of overheating
- With ignition ON (engine OFF) backprobe the sensor connector: measure reference voltage, signal voltage and ground. Record values.
- If signal reads high (near reference/battery), disconnect the sensor and re-measure the signal at the harness connector with connector disconnected. If voltage falls to expected open-circuit level or 0 V, suspect sensor short.
- If harness still shows high voltage with sensor disconnected, trace wiring toward fuse box/PCM looking for short to battery (inspect splice points, relays, accessory taps)
- If high voltage disappears when disconnecting PCM harness, suspect PCM or module with internal short — verify grounds and connections then consider module bench test or replacement per manufacturer guidance
- If wiring appears intact but intermittent, perform wiggle testing while monitoring live data to reproduce fault
- After repairs, clear codes and perform drive cycle to verify DTC does not return
Likely causes
- Wiring short to battery (+) between sensor and PCM
- Contaminated/corroded connector allowing intermittent high voltage on the signal wire
- Failed vacuum sensor (internal short to Vbatt or 5V reference)
- Incorrectly installed replacement sensor or harness
Fault status
Status
P1184 — Vacuum monitoring circuit: short to positive detected (signal too high). Inspect sensor, wiring and connectors for short to battery.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
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Workshop ManualLAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
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Code
P1184
PEUGEOT
P — Powertrain
Vacuum monitoring short circuit to positive
Views:
UK: 0
EN: 6
RU: 2
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (insulation chafed/shorted to battery positive)
- Corroded or loose connector pins allowing a positive feed to the signal circuit
- Faulty vacuum/pressure sensor with internal short to supply
- Aftermarket electrical work or repairs creating a direct short to battery positive
- Blown fuse or incorrect fuse routing that applies battery voltage to the sensor line
- PCM/input module internal fault or damaged pin shorted to battery rail
Symptoms
- Malfunction indicator lamp (MIL) / Check Engine light illuminated
- Possible engine running abnormalities (rough idle, hesitation, reduced power) if vacuum feedback used for fuel/air control
- Poor fuel economy or rich/lean running depending on system mapping
- Stored or intermittent drivability faults under certain conditions
- Possible related system warnings if vacuum used by brake assist or turbo control (vehicle dependent)
What to check
- Read freeze-frame and live data with a scan tool to confirm conditions when DTC set
- Verify battery voltage and ground integrity
- Visually inspect vacuum sensor connector and wiring along full harness route for damage, pin corrosion, or melted insulation
- Backprobe sensor signal, sensor supply (5 V or reference) and ground with ignition ON (engine OFF) and while cranking/running where safe
- Check for aftermarket accessories or recent repairs tapping into wiring near the sensor
- Inspect fuses and relays associated with sensor power/reference circuits
Signal parameters
- Expected reference supply: typically 5 V (vehicle dependent)
- Expected signal range: typically ~0.5–4.5 V for vacuum/pressure sensors (varies by sensor)
- Short-to-positive symptom: signal voltage near reference or battery voltage (≈5 V reference or higher if directly tied to battery)
- Short-to-ground symptom (contrast): signal near 0 V
Diagnostic algorithm
- Retrieve full DTC list and freeze-frame data with a scan tool; note conditions (ignition, engine speed, temperature)
- Visually inspect sensor, connector and wiring for damage, corrosion or signs of overheating
- With ignition ON (engine OFF) backprobe the sensor connector: measure reference voltage, signal voltage and ground. Record values.
- If signal reads high (near reference/battery), disconnect the sensor and re-measure the signal at the harness connector with connector disconnected. If voltage falls to expected open-circuit level or 0 V, suspect sensor short.
- If harness still shows high voltage with sensor disconnected, trace wiring toward fuse box/PCM looking for short to battery (inspect splice points, relays, accessory taps)
- If high voltage disappears when disconnecting PCM harness, suspect PCM or module with internal short — verify grounds and connections then consider module bench test or replacement per manufacturer guidance
- If wiring appears intact but intermittent, perform wiggle testing while monitoring live data to reproduce fault
- After repairs, clear codes and perform drive cycle to verify DTC does not return
Likely causes
- Wiring short to battery (+) between sensor and PCM
- Contaminated/corroded connector allowing intermittent high voltage on the signal wire
- Failed vacuum sensor (internal short to Vbatt or 5V reference)
- Incorrectly installed replacement sensor or harness
Fault status
Status
P1184 — Vacuum monitoring circuit: short to positive detected (signal too high). Inspect sensor, wiring and connectors for short to battery.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1184
VOLKSWAGEN
P — Powertrain
Linear Oxygen Sensor Common Ground Wire Open
Views:
UK: 28
EN: 35
RU: 21
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (insulation chafed/shorted to battery positive)
- Corroded or loose connector pins allowing a positive feed to the signal circuit
- Faulty vacuum/pressure sensor with internal short to supply
- Aftermarket electrical work or repairs creating a direct short to battery positive
- Blown fuse or incorrect fuse routing that applies battery voltage to the sensor line
- PCM/input module internal fault or damaged pin shorted to battery rail
Symptoms
- Malfunction indicator lamp (MIL) / Check Engine light illuminated
- Possible engine running abnormalities (rough idle, hesitation, reduced power) if vacuum feedback used for fuel/air control
- Poor fuel economy or rich/lean running depending on system mapping
- Stored or intermittent drivability faults under certain conditions
- Possible related system warnings if vacuum used by brake assist or turbo control (vehicle dependent)
What to check
- Read freeze-frame and live data with a scan tool to confirm conditions when DTC set
- Verify battery voltage and ground integrity
- Visually inspect vacuum sensor connector and wiring along full harness route for damage, pin corrosion, or melted insulation
- Backprobe sensor signal, sensor supply (5 V or reference) and ground with ignition ON (engine OFF) and while cranking/running where safe
- Check for aftermarket accessories or recent repairs tapping into wiring near the sensor
- Inspect fuses and relays associated with sensor power/reference circuits
Signal parameters
- Expected reference supply: typically 5 V (vehicle dependent)
- Expected signal range: typically ~0.5–4.5 V for vacuum/pressure sensors (varies by sensor)
- Short-to-positive symptom: signal voltage near reference or battery voltage (≈5 V reference or higher if directly tied to battery)
- Short-to-ground symptom (contrast): signal near 0 V
Diagnostic algorithm
- Retrieve full DTC list and freeze-frame data with a scan tool; note conditions (ignition, engine speed, temperature)
- Visually inspect sensor, connector and wiring for damage, corrosion or signs of overheating
- With ignition ON (engine OFF) backprobe the sensor connector: measure reference voltage, signal voltage and ground. Record values.
- If signal reads high (near reference/battery), disconnect the sensor and re-measure the signal at the harness connector with connector disconnected. If voltage falls to expected open-circuit level or 0 V, suspect sensor short.
- If harness still shows high voltage with sensor disconnected, trace wiring toward fuse box/PCM looking for short to battery (inspect splice points, relays, accessory taps)
- If high voltage disappears when disconnecting PCM harness, suspect PCM or module with internal short — verify grounds and connections then consider module bench test or replacement per manufacturer guidance
- If wiring appears intact but intermittent, perform wiggle testing while monitoring live data to reproduce fault
- After repairs, clear codes and perform drive cycle to verify DTC does not return
Likely causes
- Wiring short to battery (+) between sensor and PCM
- Contaminated/corroded connector allowing intermittent high voltage on the signal wire
- Failed vacuum sensor (internal short to Vbatt or 5V reference)
- Incorrectly installed replacement sensor or harness
Fault status
Status
P1184 — Vacuum monitoring circuit: short to positive detected (signal too high). Inspect sensor, wiring and connectors for short to battery.
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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👎 Dislike
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Send to email