Code
P0072
Generic
P — Powertrain
Ambient Air Temperature Sensor Circuit A Low
Views:
UK: 21
EN: 27
RU: 39
AI status
Completed
Completed
100%
Causes
- Short to ground in AAT sensor signal circuit
- Faulty ambient air temperature sensor (thermistor)
- Damaged, corroded, or disconnected connector
- Open or shorted wiring between sensor and control module
- Poor ground or reference voltage at the sensor circuit
- Faulty engine/BCM/ECM input (rare)
Symptoms
- Incorrect or very low ambient air temperature reading on dash or HVAC display
- Automatic HVAC climate functions may operate incorrectly
- Check Engine Light or MIL illuminated (depending on vehicle)
- Climate control auto modes, A/C or fan behavior may be erratic
- Some vehicles may show reduced range/efficiency estimates (EV/hybrid)
What to check
- Scan tool: read P0072, freeze frame and freeze data, and view live ambient air temp PID
- Visually inspect sensor location, connector, and wiring for corrosion, damage, or water intrusion
- Wiggle test wiring harness while watching live ambient temp PID to look for intermittent changes
- Measure sensor harness voltage with key ON (reference voltage usually ~5 V) and measure signal voltage at harness
- Measure sensor resistance at ambient temperature after unplugging sensor and compare to manufacturer spec (many are NTC style; common example: ~10 kΩ @ 25°C — verify SVM for vehicle)
- Check for short to ground on the signal wire using a multimeter
Signal parameters
- Typical reference supply: ~5 V (vehicle-specific; some use 12 V or other references — check service manual)
- Expected signal voltage range during normal operation: roughly 0.2–4.8 V depending on temperature and sensor design
- Circuit A Low condition generally means signal voltage below the lower threshold (e.g., < ~0.2 V) — exact thresholds are vehicle-specific
- Common sensor type: NTC thermistor (resistance decreases as temperature increases); many are ~10 kΩ at 25 °C (confirm spec)
- Resistance vs. temperature is sensor-specific; always compare measured resistance to OEM chart
Diagnostic algorithm
- Retrieve codes and live data. Note freeze frame and ambient air temp PID value.
- Visually inspect sensor, mounting, and harness for damage, corrosion, or water entry. Repair obvious issues.
- With key ON (engine OFF), backprobe the sensor connector: verify reference voltage and ground are present at the harness. If reference is missing, trace to control module/fuse.
- Measure signal voltage at the harness. If signal is very low (< manufacturer low threshold), suspect short to ground between sensor and module.
- Unplug sensor and measure resistance across sensor terminals at ambient temperature. Compare to spec. If resistance is out of range, replace sensor.
- If sensor resistance is within spec, check continuity and insulation of signal wire to the control module; repair any short to ground or open circuit.
- After repairs, clear codes and perform test drive or monitor live data to confirm proper ambient temperature readings and that code does not return.
- If wiring and sensor are good and fault persists, consider control module input fault and perform module-level diagnostics per manufacturer procedures.
Likely causes
- Corroded or pushed-out connector at the sensor
- Pinched or chafed harness causing a short to chassis ground
- Failed thermistor element inside sensor
- Missing or damaged sensor sealing allowing water intrusion
- Loose or faulty ground or reference supply from module
Fault status
Status
P0072 — Ambient Air Temperature Sensor Circuit A Low: low voltage/signal detected on ambient air temperature sensor circuit.
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?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P0072
LAND ROVER
P — Powertrain
Air temperature sensor environment - low input circuit
Views:
UK: 7
EN: 17
RU: 10
AI status
Completed
Completed
100%
Causes
- Short to ground in AAT sensor signal circuit
- Faulty ambient air temperature sensor (thermistor)
- Damaged, corroded, or disconnected connector
- Open or shorted wiring between sensor and control module
- Poor ground or reference voltage at the sensor circuit
- Faulty engine/BCM/ECM input (rare)
Symptoms
- Incorrect or very low ambient air temperature reading on dash or HVAC display
- Automatic HVAC climate functions may operate incorrectly
- Check Engine Light or MIL illuminated (depending on vehicle)
- Climate control auto modes, A/C or fan behavior may be erratic
- Some vehicles may show reduced range/efficiency estimates (EV/hybrid)
What to check
- Scan tool: read P0072, freeze frame and freeze data, and view live ambient air temp PID
- Visually inspect sensor location, connector, and wiring for corrosion, damage, or water intrusion
- Wiggle test wiring harness while watching live ambient temp PID to look for intermittent changes
- Measure sensor harness voltage with key ON (reference voltage usually ~5 V) and measure signal voltage at harness
- Measure sensor resistance at ambient temperature after unplugging sensor and compare to manufacturer spec (many are NTC style; common example: ~10 kΩ @ 25°C — verify SVM for vehicle)
- Check for short to ground on the signal wire using a multimeter
Signal parameters
- Typical reference supply: ~5 V (vehicle-specific; some use 12 V or other references — check service manual)
- Expected signal voltage range during normal operation: roughly 0.2–4.8 V depending on temperature and sensor design
- Circuit A Low condition generally means signal voltage below the lower threshold (e.g., < ~0.2 V) — exact thresholds are vehicle-specific
- Common sensor type: NTC thermistor (resistance decreases as temperature increases); many are ~10 kΩ at 25 °C (confirm spec)
- Resistance vs. temperature is sensor-specific; always compare measured resistance to OEM chart
Diagnostic algorithm
- Retrieve codes and live data. Note freeze frame and ambient air temp PID value.
- Visually inspect sensor, mounting, and harness for damage, corrosion, or water entry. Repair obvious issues.
- With key ON (engine OFF), backprobe the sensor connector: verify reference voltage and ground are present at the harness. If reference is missing, trace to control module/fuse.
- Measure signal voltage at the harness. If signal is very low (< manufacturer low threshold), suspect short to ground between sensor and module.
- Unplug sensor and measure resistance across sensor terminals at ambient temperature. Compare to spec. If resistance is out of range, replace sensor.
- If sensor resistance is within spec, check continuity and insulation of signal wire to the control module; repair any short to ground or open circuit.
- After repairs, clear codes and perform test drive or monitor live data to confirm proper ambient temperature readings and that code does not return.
- If wiring and sensor are good and fault persists, consider control module input fault and perform module-level diagnostics per manufacturer procedures.
Likely causes
- Corroded or pushed-out connector at the sensor
- Pinched or chafed harness causing a short to chassis ground
- Failed thermistor element inside sensor
- Missing or damaged sensor sealing allowing water intrusion
- Loose or faulty ground or reference supply from module
Fault status
Status
P0072 — Ambient Air Temperature Sensor Circuit A Low: low voltage/signal detected on ambient air temperature sensor circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 39
LAND ROVER 2018 Discovery HSE Luxury, 3.0L Eng VIN K
HTML ManualLAND ROVER 2018 Discovery HSE Luxury, 3.0L Eng VIN V
HTML ManualLAND ROVER 2018 Discovery HSE, 3.0L Eng VIN K
HTML ManualLAND ROVER 2018 Discovery HSE, 3.0L Eng VIN V
HTML ManualLAND ROVER 2018 Discovery Sport HSE
HTML ManualLAND ROVER 2018 Discovery Sport HSE Luxury
HTML ManualLAND ROVER 2018 Discovery Sport SE
HTML ManualLAND ROVER 2018 Range Rover Autobiography
HTML ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P0072
MITSUBISHI
P — Powertrain
Ambient air TEMP.sensor low
Views:
UK: 10
EN: 19
RU: 13
AI status
Completed
Completed
100%
Causes
- Short to ground in AAT sensor signal circuit
- Faulty ambient air temperature sensor (thermistor)
- Damaged, corroded, or disconnected connector
- Open or shorted wiring between sensor and control module
- Poor ground or reference voltage at the sensor circuit
- Faulty engine/BCM/ECM input (rare)
Symptoms
- Incorrect or very low ambient air temperature reading on dash or HVAC display
- Automatic HVAC climate functions may operate incorrectly
- Check Engine Light or MIL illuminated (depending on vehicle)
- Climate control auto modes, A/C or fan behavior may be erratic
- Some vehicles may show reduced range/efficiency estimates (EV/hybrid)
What to check
- Scan tool: read P0072, freeze frame and freeze data, and view live ambient air temp PID
- Visually inspect sensor location, connector, and wiring for corrosion, damage, or water intrusion
- Wiggle test wiring harness while watching live ambient temp PID to look for intermittent changes
- Measure sensor harness voltage with key ON (reference voltage usually ~5 V) and measure signal voltage at harness
- Measure sensor resistance at ambient temperature after unplugging sensor and compare to manufacturer spec (many are NTC style; common example: ~10 kΩ @ 25°C — verify SVM for vehicle)
- Check for short to ground on the signal wire using a multimeter
Signal parameters
- Typical reference supply: ~5 V (vehicle-specific; some use 12 V or other references — check service manual)
- Expected signal voltage range during normal operation: roughly 0.2–4.8 V depending on temperature and sensor design
- Circuit A Low condition generally means signal voltage below the lower threshold (e.g., < ~0.2 V) — exact thresholds are vehicle-specific
- Common sensor type: NTC thermistor (resistance decreases as temperature increases); many are ~10 kΩ at 25 °C (confirm spec)
- Resistance vs. temperature is sensor-specific; always compare measured resistance to OEM chart
Diagnostic algorithm
- Retrieve codes and live data. Note freeze frame and ambient air temp PID value.
- Visually inspect sensor, mounting, and harness for damage, corrosion, or water entry. Repair obvious issues.
- With key ON (engine OFF), backprobe the sensor connector: verify reference voltage and ground are present at the harness. If reference is missing, trace to control module/fuse.
- Measure signal voltage at the harness. If signal is very low (< manufacturer low threshold), suspect short to ground between sensor and module.
- Unplug sensor and measure resistance across sensor terminals at ambient temperature. Compare to spec. If resistance is out of range, replace sensor.
- If sensor resistance is within spec, check continuity and insulation of signal wire to the control module; repair any short to ground or open circuit.
- After repairs, clear codes and perform test drive or monitor live data to confirm proper ambient temperature readings and that code does not return.
- If wiring and sensor are good and fault persists, consider control module input fault and perform module-level diagnostics per manufacturer procedures.
Likely causes
- Corroded or pushed-out connector at the sensor
- Pinched or chafed harness causing a short to chassis ground
- Failed thermistor element inside sensor
- Missing or damaged sensor sealing allowing water intrusion
- Loose or faulty ground or reference supply from module
Fault status
Status
P0072 — Ambient Air Temperature Sensor Circuit A Low: low voltage/signal detected on ambient air temperature sensor circuit.
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?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email