P1199
Radiator Temperature Sensor Voltage Too Low
Causes
- Failed radiator temperature sensor (thermistor)
- Short to ground in the sensor signal wire
- Open or high-resistance wiring/connector (poor pin contact, corrosion)
- Lost or low reference voltage from the ECM
- Poor ground at sensor or ECM
- Coolant-related damage to sensor (contamination, corrosion)
Symptoms
- Check Engine Light (MIL) illuminated
- Cooling fan(s) may run continuously or not run when expected
- Erratic or incorrect coolant temperature gauge reading
- Possible poor idle or drivability issues under temperature-related conditions
- Reduced engine performance or limp functionality if ECM limits systems due to invalid temp input
What to check
- Retrieve freeze frame data and stored/MIL history for P1199 and any related DTCs
- Visually inspect radiator area wiring, connectors, and sensor for damage or corrosion
- Check connector pins for corrosion, bent pins, or water intrusion
- Scan live data: monitor radiator temp sensor voltage and coolant temperature reading while key on and during engine warm-up
- Verify battery voltage and grounds before testing sensors (voltage
- Backprobe sensor connector and wiggle wiring while monitoring live data for intermittent faults
Signal parameters
- Sensor type: thermistor (NTC style) — resistance decreases as temperature increases
- Circuit: 3-wire or 2-wire arrangement depending on application — typically signal, ground, and sometimes a 5 V reference
- Expected reference: nominal 5 V reference from ECM (verify spec for vehicle)
- Expected signal voltage range: ~0.1–4.9 V depending on temperature (cold = higher voltage, hot = lower voltage for NTC)
- Typical behavior: as coolant warms, sensor voltage falls and calculated temperature rises
Diagnostic algorithm
- Verify P1199 is current and note freeze-frame and any additional DTCs. Clear codes and re-run if intermittent.
- Perform visual inspection of radiator area wiring, harness clamps, and sensor connector. Repair any obvious damage or corrosion.
- With ignition ON (engine off) monitor sensor voltage via scan tool. Check for stable 5 V reference (if equipped) and good ground at connector.
- Backprobe the signal wire and wiggle the harness while watching live data for voltage drops or erratic changes.
- Measure sensor resistance at ambient and while heating with warm coolant or hot water (engine cold, then warm carefully). Compare resistance to OEM chart; NTC sensors show decreasing resistance as temperature increases.
- If signal is very low (near 0 V) and reference is present, check for short to ground in the signal wire: disconnect sensor and measure continuity from signal pin to chassis ground.
- Check continuity from sensor connector to ECM connector and verify pin-to-pin resistance and proper grounding.
- Repair wiring/connectors or replace sensor if out of spec. After repairs, clear codes and perform drive cycle to verify code does not return.
- Only consider ECM replacement after all wiring and sensor checks are confirmed good and bench/bench/vehicle tests indicate ECM failure.
Likely causes
- Damaged sensor connector or corroded pins
- Broken or chafed signal wire shorting to chassis ground
- Failed temperature sensor (internal short or open)
- Bad ground at radiator/sensor mounting point
- Blown fuse or ECM reference output fault
Fault status
Similar codes
P1199
Fuel Level Input Circuit Low
Causes
- Failed radiator temperature sensor (thermistor)
- Short to ground in the sensor signal wire
- Open or high-resistance wiring/connector (poor pin contact, corrosion)
- Lost or low reference voltage from the ECM
- Poor ground at sensor or ECM
- Coolant-related damage to sensor (contamination, corrosion)
Symptoms
- Check Engine Light (MIL) illuminated
- Cooling fan(s) may run continuously or not run when expected
- Erratic or incorrect coolant temperature gauge reading
- Possible poor idle or drivability issues under temperature-related conditions
- Reduced engine performance or limp functionality if ECM limits systems due to invalid temp input
What to check
- Retrieve freeze frame data and stored/MIL history for P1199 and any related DTCs
- Visually inspect radiator area wiring, connectors, and sensor for damage or corrosion
- Check connector pins for corrosion, bent pins, or water intrusion
- Scan live data: monitor radiator temp sensor voltage and coolant temperature reading while key on and during engine warm-up
- Verify battery voltage and grounds before testing sensors (voltage
- Backprobe sensor connector and wiggle wiring while monitoring live data for intermittent faults
Signal parameters
- Sensor type: thermistor (NTC style) — resistance decreases as temperature increases
- Circuit: 3-wire or 2-wire arrangement depending on application — typically signal, ground, and sometimes a 5 V reference
- Expected reference: nominal 5 V reference from ECM (verify spec for vehicle)
- Expected signal voltage range: ~0.1–4.9 V depending on temperature (cold = higher voltage, hot = lower voltage for NTC)
- Typical behavior: as coolant warms, sensor voltage falls and calculated temperature rises
Diagnostic algorithm
- Verify P1199 is current and note freeze-frame and any additional DTCs. Clear codes and re-run if intermittent.
- Perform visual inspection of radiator area wiring, harness clamps, and sensor connector. Repair any obvious damage or corrosion.
- With ignition ON (engine off) monitor sensor voltage via scan tool. Check for stable 5 V reference (if equipped) and good ground at connector.
- Backprobe the signal wire and wiggle the harness while watching live data for voltage drops or erratic changes.
- Measure sensor resistance at ambient and while heating with warm coolant or hot water (engine cold, then warm carefully). Compare resistance to OEM chart; NTC sensors show decreasing resistance as temperature increases.
- If signal is very low (near 0 V) and reference is present, check for short to ground in the signal wire: disconnect sensor and measure continuity from signal pin to chassis ground.
- Check continuity from sensor connector to ECM connector and verify pin-to-pin resistance and proper grounding.
- Repair wiring/connectors or replace sensor if out of spec. After repairs, clear codes and perform drive cycle to verify code does not return.
- Only consider ECM replacement after all wiring and sensor checks are confirmed good and bench/bench/vehicle tests indicate ECM failure.
Likely causes
- Damaged sensor connector or corroded pins
- Broken or chafed signal wire shorting to chassis ground
- Failed temperature sensor (internal short or open)
- Bad ground at radiator/sensor mounting point
- Blown fuse or ECM reference output fault
Fault status
Similar codes
P1199
Radiator Temperature Sensor Voltage Too Low
Causes
- Failed radiator temperature sensor (thermistor)
- Short to ground in the sensor signal wire
- Open or high-resistance wiring/connector (poor pin contact, corrosion)
- Lost or low reference voltage from the ECM
- Poor ground at sensor or ECM
- Coolant-related damage to sensor (contamination, corrosion)
Symptoms
- Check Engine Light (MIL) illuminated
- Cooling fan(s) may run continuously or not run when expected
- Erratic or incorrect coolant temperature gauge reading
- Possible poor idle or drivability issues under temperature-related conditions
- Reduced engine performance or limp functionality if ECM limits systems due to invalid temp input
What to check
- Retrieve freeze frame data and stored/MIL history for P1199 and any related DTCs
- Visually inspect radiator area wiring, connectors, and sensor for damage or corrosion
- Check connector pins for corrosion, bent pins, or water intrusion
- Scan live data: monitor radiator temp sensor voltage and coolant temperature reading while key on and during engine warm-up
- Verify battery voltage and grounds before testing sensors (voltage
- Backprobe sensor connector and wiggle wiring while monitoring live data for intermittent faults
Signal parameters
- Sensor type: thermistor (NTC style) — resistance decreases as temperature increases
- Circuit: 3-wire or 2-wire arrangement depending on application — typically signal, ground, and sometimes a 5 V reference
- Expected reference: nominal 5 V reference from ECM (verify spec for vehicle)
- Expected signal voltage range: ~0.1–4.9 V depending on temperature (cold = higher voltage, hot = lower voltage for NTC)
- Typical behavior: as coolant warms, sensor voltage falls and calculated temperature rises
Diagnostic algorithm
- Verify P1199 is current and note freeze-frame and any additional DTCs. Clear codes and re-run if intermittent.
- Perform visual inspection of radiator area wiring, harness clamps, and sensor connector. Repair any obvious damage or corrosion.
- With ignition ON (engine off) monitor sensor voltage via scan tool. Check for stable 5 V reference (if equipped) and good ground at connector.
- Backprobe the signal wire and wiggle the harness while watching live data for voltage drops or erratic changes.
- Measure sensor resistance at ambient and while heating with warm coolant or hot water (engine cold, then warm carefully). Compare resistance to OEM chart; NTC sensors show decreasing resistance as temperature increases.
- If signal is very low (near 0 V) and reference is present, check for short to ground in the signal wire: disconnect sensor and measure continuity from signal pin to chassis ground.
- Check continuity from sensor connector to ECM connector and verify pin-to-pin resistance and proper grounding.
- Repair wiring/connectors or replace sensor if out of spec. After repairs, clear codes and perform drive cycle to verify code does not return.
- Only consider ECM replacement after all wiring and sensor checks are confirmed good and bench/bench/vehicle tests indicate ECM failure.
Likely causes
- Damaged sensor connector or corroded pins
- Broken or chafed signal wire shorting to chassis ground
- Failed temperature sensor (internal short or open)
- Bad ground at radiator/sensor mounting point
- Blown fuse or ECM reference output fault
Fault status
Similar codes
P1199
Low fuel level sensor input
Causes
- Failed radiator temperature sensor (thermistor)
- Short to ground in the sensor signal wire
- Open or high-resistance wiring/connector (poor pin contact, corrosion)
- Lost or low reference voltage from the ECM
- Poor ground at sensor or ECM
- Coolant-related damage to sensor (contamination, corrosion)
Symptoms
- Check Engine Light (MIL) illuminated
- Cooling fan(s) may run continuously or not run when expected
- Erratic or incorrect coolant temperature gauge reading
- Possible poor idle or drivability issues under temperature-related conditions
- Reduced engine performance or limp functionality if ECM limits systems due to invalid temp input
What to check
- Retrieve freeze frame data and stored/MIL history for P1199 and any related DTCs
- Visually inspect radiator area wiring, connectors, and sensor for damage or corrosion
- Check connector pins for corrosion, bent pins, or water intrusion
- Scan live data: monitor radiator temp sensor voltage and coolant temperature reading while key on and during engine warm-up
- Verify battery voltage and grounds before testing sensors (voltage
- Backprobe sensor connector and wiggle wiring while monitoring live data for intermittent faults
Signal parameters
- Sensor type: thermistor (NTC style) — resistance decreases as temperature increases
- Circuit: 3-wire or 2-wire arrangement depending on application — typically signal, ground, and sometimes a 5 V reference
- Expected reference: nominal 5 V reference from ECM (verify spec for vehicle)
- Expected signal voltage range: ~0.1–4.9 V depending on temperature (cold = higher voltage, hot = lower voltage for NTC)
- Typical behavior: as coolant warms, sensor voltage falls and calculated temperature rises
Diagnostic algorithm
- Verify P1199 is current and note freeze-frame and any additional DTCs. Clear codes and re-run if intermittent.
- Perform visual inspection of radiator area wiring, harness clamps, and sensor connector. Repair any obvious damage or corrosion.
- With ignition ON (engine off) monitor sensor voltage via scan tool. Check for stable 5 V reference (if equipped) and good ground at connector.
- Backprobe the signal wire and wiggle the harness while watching live data for voltage drops or erratic changes.
- Measure sensor resistance at ambient and while heating with warm coolant or hot water (engine cold, then warm carefully). Compare resistance to OEM chart; NTC sensors show decreasing resistance as temperature increases.
- If signal is very low (near 0 V) and reference is present, check for short to ground in the signal wire: disconnect sensor and measure continuity from signal pin to chassis ground.
- Check continuity from sensor connector to ECM connector and verify pin-to-pin resistance and proper grounding.
- Repair wiring/connectors or replace sensor if out of spec. After repairs, clear codes and perform drive cycle to verify code does not return.
- Only consider ECM replacement after all wiring and sensor checks are confirmed good and bench/bench/vehicle tests indicate ECM failure.
Likely causes
- Damaged sensor connector or corroded pins
- Broken or chafed signal wire shorting to chassis ground
- Failed temperature sensor (internal short or open)
- Bad ground at radiator/sensor mounting point
- Blown fuse or ECM reference output fault
Fault status
Similar codes
Manual library for LAND ROVER
Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
LAND ROVER
-
LAND ROVER: 2022
-
Defender
- 90
- 90
- 90 S
- 90 S
- 90 V8
- 90 V8
- 90 V8 Carpathian Edition
- 90 V8 Carpathian Edition
- 90 X
- 90 X
- 90 X-Dynamic HSE
- 90 X-Dynamic HSE
- 90 X-Dynamic S
- 90 X-Dynamic S
- 90 X-Dynamic SE
- 90 X-Dynamic SE
- 110
- 110
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 V8
- 110 V8
- 110 V8 Carpathian Edition
- 110 V8 Carpathian Edition
- 110 X
- 110 X
- 110 X-Dynamic SE
- 110 X-Dynamic SE
- 110 XS Edition
- 110 XS Edition
-
Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- 2022 Range Rover Base
- 2022 Range Rover Base
- First Edition
- First Edition
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SV
- SV
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
-
Range Rover Evoque
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
-
-
LAND ROVER: 2021
-
Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography Fifty Edition
- Autobiography Fifty Edition
- 2021 Range Rover Base
- 2021 Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
-
Range Rover Evoque
-
Range Rover Sport
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- HSE Dynamic
- HSE Dynamic
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HST
- HST
- SE
- SE
- SVR
- SVR
- SVR Carbon Edition
- SVR Carbon Edition
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
-
LAND ROVER: 2020
-
Defender
- 90 First Edition
- 90 First Edition
- 110 First Edition
- 110 First Edition
- 110 HSE
- 110 HSE
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 X
- 110 X
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
-
Discovery
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- Landmark
- Landmark
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
-
Range Rover
- Autobiography
- Autobiography
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
-
Range Rover Evoque
-
Range Rover Sport
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE Dynamic
- HSE Dynamic
- HSE PHEV
- HSE PHEV
- HST
- HST
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SVR
- SVR
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- SVAutobiography Dyn.
- SVAutobiography Dyn.
-
P1199
Fuel Level Input Circuit Low
Causes
- Failed radiator temperature sensor (thermistor)
- Short to ground in the sensor signal wire
- Open or high-resistance wiring/connector (poor pin contact, corrosion)
- Lost or low reference voltage from the ECM
- Poor ground at sensor or ECM
- Coolant-related damage to sensor (contamination, corrosion)
Symptoms
- Check Engine Light (MIL) illuminated
- Cooling fan(s) may run continuously or not run when expected
- Erratic or incorrect coolant temperature gauge reading
- Possible poor idle or drivability issues under temperature-related conditions
- Reduced engine performance or limp functionality if ECM limits systems due to invalid temp input
What to check
- Retrieve freeze frame data and stored/MIL history for P1199 and any related DTCs
- Visually inspect radiator area wiring, connectors, and sensor for damage or corrosion
- Check connector pins for corrosion, bent pins, or water intrusion
- Scan live data: monitor radiator temp sensor voltage and coolant temperature reading while key on and during engine warm-up
- Verify battery voltage and grounds before testing sensors (voltage
- Backprobe sensor connector and wiggle wiring while monitoring live data for intermittent faults
Signal parameters
- Sensor type: thermistor (NTC style) — resistance decreases as temperature increases
- Circuit: 3-wire or 2-wire arrangement depending on application — typically signal, ground, and sometimes a 5 V reference
- Expected reference: nominal 5 V reference from ECM (verify spec for vehicle)
- Expected signal voltage range: ~0.1–4.9 V depending on temperature (cold = higher voltage, hot = lower voltage for NTC)
- Typical behavior: as coolant warms, sensor voltage falls and calculated temperature rises
Diagnostic algorithm
- Verify P1199 is current and note freeze-frame and any additional DTCs. Clear codes and re-run if intermittent.
- Perform visual inspection of radiator area wiring, harness clamps, and sensor connector. Repair any obvious damage or corrosion.
- With ignition ON (engine off) monitor sensor voltage via scan tool. Check for stable 5 V reference (if equipped) and good ground at connector.
- Backprobe the signal wire and wiggle the harness while watching live data for voltage drops or erratic changes.
- Measure sensor resistance at ambient and while heating with warm coolant or hot water (engine cold, then warm carefully). Compare resistance to OEM chart; NTC sensors show decreasing resistance as temperature increases.
- If signal is very low (near 0 V) and reference is present, check for short to ground in the signal wire: disconnect sensor and measure continuity from signal pin to chassis ground.
- Check continuity from sensor connector to ECM connector and verify pin-to-pin resistance and proper grounding.
- Repair wiring/connectors or replace sensor if out of spec. After repairs, clear codes and perform drive cycle to verify code does not return.
- Only consider ECM replacement after all wiring and sensor checks are confirmed good and bench/bench/vehicle tests indicate ECM failure.
Likely causes
- Damaged sensor connector or corroded pins
- Broken or chafed signal wire shorting to chassis ground
- Failed temperature sensor (internal short or open)
- Bad ground at radiator/sensor mounting point
- Blown fuse or ECM reference output fault
Fault status
Similar codes
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P1199
Radiator Temperature Sensor Voltage Too Low
Causes
- Failed radiator temperature sensor (thermistor)
- Short to ground in the sensor signal wire
- Open or high-resistance wiring/connector (poor pin contact, corrosion)
- Lost or low reference voltage from the ECM
- Poor ground at sensor or ECM
- Coolant-related damage to sensor (contamination, corrosion)
Symptoms
- Check Engine Light (MIL) illuminated
- Cooling fan(s) may run continuously or not run when expected
- Erratic or incorrect coolant temperature gauge reading
- Possible poor idle or drivability issues under temperature-related conditions
- Reduced engine performance or limp functionality if ECM limits systems due to invalid temp input
What to check
- Retrieve freeze frame data and stored/MIL history for P1199 and any related DTCs
- Visually inspect radiator area wiring, connectors, and sensor for damage or corrosion
- Check connector pins for corrosion, bent pins, or water intrusion
- Scan live data: monitor radiator temp sensor voltage and coolant temperature reading while key on and during engine warm-up
- Verify battery voltage and grounds before testing sensors (voltage
- Backprobe sensor connector and wiggle wiring while monitoring live data for intermittent faults
Signal parameters
- Sensor type: thermistor (NTC style) — resistance decreases as temperature increases
- Circuit: 3-wire or 2-wire arrangement depending on application — typically signal, ground, and sometimes a 5 V reference
- Expected reference: nominal 5 V reference from ECM (verify spec for vehicle)
- Expected signal voltage range: ~0.1–4.9 V depending on temperature (cold = higher voltage, hot = lower voltage for NTC)
- Typical behavior: as coolant warms, sensor voltage falls and calculated temperature rises
Diagnostic algorithm
- Verify P1199 is current and note freeze-frame and any additional DTCs. Clear codes and re-run if intermittent.
- Perform visual inspection of radiator area wiring, harness clamps, and sensor connector. Repair any obvious damage or corrosion.
- With ignition ON (engine off) monitor sensor voltage via scan tool. Check for stable 5 V reference (if equipped) and good ground at connector.
- Backprobe the signal wire and wiggle the harness while watching live data for voltage drops or erratic changes.
- Measure sensor resistance at ambient and while heating with warm coolant or hot water (engine cold, then warm carefully). Compare resistance to OEM chart; NTC sensors show decreasing resistance as temperature increases.
- If signal is very low (near 0 V) and reference is present, check for short to ground in the signal wire: disconnect sensor and measure continuity from signal pin to chassis ground.
- Check continuity from sensor connector to ECM connector and verify pin-to-pin resistance and proper grounding.
- Repair wiring/connectors or replace sensor if out of spec. After repairs, clear codes and perform drive cycle to verify code does not return.
- Only consider ECM replacement after all wiring and sensor checks are confirmed good and bench/bench/vehicle tests indicate ECM failure.
Likely causes
- Damaged sensor connector or corroded pins
- Broken or chafed signal wire shorting to chassis ground
- Failed temperature sensor (internal short or open)
- Bad ground at radiator/sensor mounting point
- Blown fuse or ECM reference output fault
Fault status
Similar codes
P1199
Radiator Temperature Sensor Voltage Too Low
Causes
- Failed radiator temperature sensor (thermistor)
- Short to ground in the sensor signal wire
- Open or high-resistance wiring/connector (poor pin contact, corrosion)
- Lost or low reference voltage from the ECM
- Poor ground at sensor or ECM
- Coolant-related damage to sensor (contamination, corrosion)
Symptoms
- Check Engine Light (MIL) illuminated
- Cooling fan(s) may run continuously or not run when expected
- Erratic or incorrect coolant temperature gauge reading
- Possible poor idle or drivability issues under temperature-related conditions
- Reduced engine performance or limp functionality if ECM limits systems due to invalid temp input
What to check
- Retrieve freeze frame data and stored/MIL history for P1199 and any related DTCs
- Visually inspect radiator area wiring, connectors, and sensor for damage or corrosion
- Check connector pins for corrosion, bent pins, or water intrusion
- Scan live data: monitor radiator temp sensor voltage and coolant temperature reading while key on and during engine warm-up
- Verify battery voltage and grounds before testing sensors (voltage
- Backprobe sensor connector and wiggle wiring while monitoring live data for intermittent faults
Signal parameters
- Sensor type: thermistor (NTC style) — resistance decreases as temperature increases
- Circuit: 3-wire or 2-wire arrangement depending on application — typically signal, ground, and sometimes a 5 V reference
- Expected reference: nominal 5 V reference from ECM (verify spec for vehicle)
- Expected signal voltage range: ~0.1–4.9 V depending on temperature (cold = higher voltage, hot = lower voltage for NTC)
- Typical behavior: as coolant warms, sensor voltage falls and calculated temperature rises
Diagnostic algorithm
- Verify P1199 is current and note freeze-frame and any additional DTCs. Clear codes and re-run if intermittent.
- Perform visual inspection of radiator area wiring, harness clamps, and sensor connector. Repair any obvious damage or corrosion.
- With ignition ON (engine off) monitor sensor voltage via scan tool. Check for stable 5 V reference (if equipped) and good ground at connector.
- Backprobe the signal wire and wiggle the harness while watching live data for voltage drops or erratic changes.
- Measure sensor resistance at ambient and while heating with warm coolant or hot water (engine cold, then warm carefully). Compare resistance to OEM chart; NTC sensors show decreasing resistance as temperature increases.
- If signal is very low (near 0 V) and reference is present, check for short to ground in the signal wire: disconnect sensor and measure continuity from signal pin to chassis ground.
- Check continuity from sensor connector to ECM connector and verify pin-to-pin resistance and proper grounding.
- Repair wiring/connectors or replace sensor if out of spec. After repairs, clear codes and perform drive cycle to verify code does not return.
- Only consider ECM replacement after all wiring and sensor checks are confirmed good and bench/bench/vehicle tests indicate ECM failure.
Likely causes
- Damaged sensor connector or corroded pins
- Broken or chafed signal wire shorting to chassis ground
- Failed temperature sensor (internal short or open)
- Bad ground at radiator/sensor mounting point
- Blown fuse or ECM reference output fault
Fault status
Similar codes
P1199
Radiator Temperature Sensor Input voltage too low
Causes
- Failed radiator temperature sensor (thermistor)
- Short to ground in the sensor signal wire
- Open or high-resistance wiring/connector (poor pin contact, corrosion)
- Lost or low reference voltage from the ECM
- Poor ground at sensor or ECM
- Coolant-related damage to sensor (contamination, corrosion)
Symptoms
- Check Engine Light (MIL) illuminated
- Cooling fan(s) may run continuously or not run when expected
- Erratic or incorrect coolant temperature gauge reading
- Possible poor idle or drivability issues under temperature-related conditions
- Reduced engine performance or limp functionality if ECM limits systems due to invalid temp input
What to check
- Retrieve freeze frame data and stored/MIL history for P1199 and any related DTCs
- Visually inspect radiator area wiring, connectors, and sensor for damage or corrosion
- Check connector pins for corrosion, bent pins, or water intrusion
- Scan live data: monitor radiator temp sensor voltage and coolant temperature reading while key on and during engine warm-up
- Verify battery voltage and grounds before testing sensors (voltage
- Backprobe sensor connector and wiggle wiring while monitoring live data for intermittent faults
Signal parameters
- Sensor type: thermistor (NTC style) — resistance decreases as temperature increases
- Circuit: 3-wire or 2-wire arrangement depending on application — typically signal, ground, and sometimes a 5 V reference
- Expected reference: nominal 5 V reference from ECM (verify spec for vehicle)
- Expected signal voltage range: ~0.1–4.9 V depending on temperature (cold = higher voltage, hot = lower voltage for NTC)
- Typical behavior: as coolant warms, sensor voltage falls and calculated temperature rises
Diagnostic algorithm
- Verify P1199 is current and note freeze-frame and any additional DTCs. Clear codes and re-run if intermittent.
- Perform visual inspection of radiator area wiring, harness clamps, and sensor connector. Repair any obvious damage or corrosion.
- With ignition ON (engine off) monitor sensor voltage via scan tool. Check for stable 5 V reference (if equipped) and good ground at connector.
- Backprobe the signal wire and wiggle the harness while watching live data for voltage drops or erratic changes.
- Measure sensor resistance at ambient and while heating with warm coolant or hot water (engine cold, then warm carefully). Compare resistance to OEM chart; NTC sensors show decreasing resistance as temperature increases.
- If signal is very low (near 0 V) and reference is present, check for short to ground in the signal wire: disconnect sensor and measure continuity from signal pin to chassis ground.
- Check continuity from sensor connector to ECM connector and verify pin-to-pin resistance and proper grounding.
- Repair wiring/connectors or replace sensor if out of spec. After repairs, clear codes and perform drive cycle to verify code does not return.
- Only consider ECM replacement after all wiring and sensor checks are confirmed good and bench/bench/vehicle tests indicate ECM failure.
Likely causes
- Damaged sensor connector or corroded pins
- Broken or chafed signal wire shorting to chassis ground
- Failed temperature sensor (internal short or open)
- Bad ground at radiator/sensor mounting point
- Blown fuse or ECM reference output fault
Fault status
Similar codes
P1199
Oxygen Sensor Heater Circuit Bank 2 Sensor 2 Electrical Malfunction
Causes
- Failed radiator temperature sensor (thermistor)
- Short to ground in the sensor signal wire
- Open or high-resistance wiring/connector (poor pin contact, corrosion)
- Lost or low reference voltage from the ECM
- Poor ground at sensor or ECM
- Coolant-related damage to sensor (contamination, corrosion)
Symptoms
- Check Engine Light (MIL) illuminated
- Cooling fan(s) may run continuously or not run when expected
- Erratic or incorrect coolant temperature gauge reading
- Possible poor idle or drivability issues under temperature-related conditions
- Reduced engine performance or limp functionality if ECM limits systems due to invalid temp input
What to check
- Retrieve freeze frame data and stored/MIL history for P1199 and any related DTCs
- Visually inspect radiator area wiring, connectors, and sensor for damage or corrosion
- Check connector pins for corrosion, bent pins, or water intrusion
- Scan live data: monitor radiator temp sensor voltage and coolant temperature reading while key on and during engine warm-up
- Verify battery voltage and grounds before testing sensors (voltage
- Backprobe sensor connector and wiggle wiring while monitoring live data for intermittent faults
Signal parameters
- Sensor type: thermistor (NTC style) — resistance decreases as temperature increases
- Circuit: 3-wire or 2-wire arrangement depending on application — typically signal, ground, and sometimes a 5 V reference
- Expected reference: nominal 5 V reference from ECM (verify spec for vehicle)
- Expected signal voltage range: ~0.1–4.9 V depending on temperature (cold = higher voltage, hot = lower voltage for NTC)
- Typical behavior: as coolant warms, sensor voltage falls and calculated temperature rises
Diagnostic algorithm
- Verify P1199 is current and note freeze-frame and any additional DTCs. Clear codes and re-run if intermittent.
- Perform visual inspection of radiator area wiring, harness clamps, and sensor connector. Repair any obvious damage or corrosion.
- With ignition ON (engine off) monitor sensor voltage via scan tool. Check for stable 5 V reference (if equipped) and good ground at connector.
- Backprobe the signal wire and wiggle the harness while watching live data for voltage drops or erratic changes.
- Measure sensor resistance at ambient and while heating with warm coolant or hot water (engine cold, then warm carefully). Compare resistance to OEM chart; NTC sensors show decreasing resistance as temperature increases.
- If signal is very low (near 0 V) and reference is present, check for short to ground in the signal wire: disconnect sensor and measure continuity from signal pin to chassis ground.
- Check continuity from sensor connector to ECM connector and verify pin-to-pin resistance and proper grounding.
- Repair wiring/connectors or replace sensor if out of spec. After repairs, clear codes and perform drive cycle to verify code does not return.
- Only consider ECM replacement after all wiring and sensor checks are confirmed good and bench/bench/vehicle tests indicate ECM failure.
Likely causes
- Damaged sensor connector or corroded pins
- Broken or chafed signal wire shorting to chassis ground
- Failed temperature sensor (internal short or open)
- Bad ground at radiator/sensor mounting point
- Blown fuse or ECM reference output fault
Fault status
Similar codes
Manual library for VOLKSWAGEN
Browse 139 VOLKSWAGEN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
VOLKSWAGEN
-
VOLKSWAGEN: 2021
-
Atlas
- S, AWD
- S, FWD
- SE, 2.0L Eng VIN P, AWD
- SE, 2.0L Eng VIN P, FWD
- SE, 3.6L Eng VIN R, AWD
- SE, 3.6L Eng VIN R, FWD
- SEL, 2.0L Eng VIN P · 2.0L Eng VIN P2021: Atlas SEL
- SEL, 3.6L Eng VIN R, AWD
- SEL, 3.6L Eng VIN R, FWD
- SEL Premium, 2.0L Eng VIN P · 2.0L Eng VIN P2021: Atlas SEL Premium
- SEL Premium, 3.6L Eng VIN R · 3.6L Eng VIN R2021: Atlas SEL Premium
- SEL Premium R-Line
- SEL R-Line, AWD
- SEL R-Line, FWD
- SE R-Line, AWD
- SE R-Line, FWD
-
Atlas Cross Sport
- S, AWD
- S, FWD
- SE, 2.0L Eng VIN C, AWD
- SE, 2.0L Eng VIN C, FWD
- SE, 3.6L Eng VIN E, AWD
- SE, 3.6L Eng VIN E, FWD
- SEL, 2.0L Eng VIN C · 2.0L Eng VIN C2021: Atlas Cross Sport SEL
- SEL, 3.6L Eng VIN E, AWD
- SEL, 3.6L Eng VIN E, FWD
- SEL Premium, 2.0L Eng VIN C · 2.0L Eng VIN C2021: Atlas Cross Sport SEL Premium
- SEL Premium, 3.6L Eng VIN E · 3.6L Eng VIN E2021: Atlas Cross Sport SEL Premium
- SEL Premium R-Line
- SEL R-Line, AWD
- SEL R-Line, FWD
- SE R-Line, AWD
- SE R-Line, FWD
-
VOLKSWAGEN: 2020
-
Atlas
- S, 2.0L Eng VIN P · 2.0L Eng VIN P2020: Atlas S
- S, 3.6L Eng VIN R · 3.6L Eng VIN R2020: Atlas S
- SE, 2.0L Eng VIN P · 2.0L Eng VIN P2020: Atlas SE
- SE, 3.6L Eng VIN R, AWD
- SE, 3.6L Eng VIN R, FWD
- SEL, 2.0L Eng VIN P · 2.0L Eng VIN P2020: Atlas SEL
- SEL, 3.6L Eng VIN R, AWD
- SEL, 3.6L Eng VIN R, FWD
- SEL Premium
- SEL R-Line, AWD
- SEL R-Line, FWD
- SE R-Line, AWD
- SE R-Line, FWD
-
Atlas Cross Sport
- S, AWD
- S, FWD
- SE, 2.0L Eng VIN C, AWD
- SE, 2.0L Eng VIN C, FWD
- SE, 3.6L Eng VIN E, AWD
- SE, 3.6L Eng VIN E, FWD
- SEL, 2.0L Eng VIN C, AWD
- SEL, 2.0L Eng VIN C, FWD
- SEL, 3.6L Eng VIN E, AWD
- SEL, 3.6L Eng VIN E, FWD
- SEL Premium
- SEL Premium R-Line
- SEL R-Line, AWD
- SEL R-Line, FWD
- SE R-Line, AWD
- SE R-Line, FWD
-
Jetta
- GLI Autobahn, Automatic DCT Trans
- GLI Autobahn, Standard Trans
- GLI S, Automatic DCT Trans
- GLI S, Standard Trans
- R-Line, 1.4L Eng VIN 5, Automatic Trans
- R-Line, 1.4L Eng VIN 5, Standard Trans
- R-Line, 1.4L Eng VIN B · 1.4L Eng VIN B2020: Jetta R-Line
- S, 1.4L Eng VIN 5, Automatic Trans
- S, 1.4L Eng VIN 5, Standard Trans
- S, 1.4L Eng VIN B · 1.4L Eng VIN B2020: Jetta S
- SE, 1.4L Eng VIN 5 · 1.4L Eng VIN 52020: Jetta SE
- SE, 1.4L Eng VIN B · 1.4L Eng VIN B2020: Jetta SE
- SEL, 1.4L Eng VIN 5 · 1.4L Eng VIN 52020: Jetta SEL
- SEL, 1.4L Eng VIN B · 1.4L Eng VIN B2020: Jetta SEL
- SEL Premium, 1.4L Eng VIN 5 · 1.4L Eng VIN 52020: Jetta SEL Premium
- SEL Premium, 1.4L Eng VIN B · 1.4L Eng VIN B2020: Jetta SEL Premium
