These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.

Ignition Switch Run Position Circuit Low

Ignition Switch Run Position Circuit High

Why an ignition-state fault can appear in throttle supervision

Transmission controller sees run/crank low while the ECM reports it active

Run/start input stays high after the reported run/crank state becomes inactive

Transmission controller sees accessory input disagree with power mode

Accessory-line voltage disagrees with the wakeup state

accessory-input diagnosis includes the network power-mode state

Transit KOEO self-test code versus a running-engine fault

PTO Sense Circuit/Open

PTO Sense Circuit Range/Performance

PTO Sense Circuit Low

Ram PTO-sense high and the AS69RC software case

PTO Sense Circuit Intermittent/Erratic

Oil deterioration inferred from dilution and pressure change

Low-pressure fuel performance after running dry or filter service

low fuel-pressure sensor voltage is not a direct low-pressure measurement

A high electrical signal from the low-pressure fuel sensor

the VAG G410 interpretation includes fuel-supply restriction

Transmission torque-request messages fail validity checks

Torque Management Request Input Signal A Range/Performance

Torque Management Request Input Signal A Low

Torque Management Request Input Signal A High

Performance-launch torque message fails an integrity check

Torque Management Request Input Signal B Range/Performance

PTO Speed Selector Sensor/Switch 1 Circuit/Open

PTO Speed Selector Sensor/Switch 1 Range/Performance

PTO Speed Selector Sensor/Switch 1 Circuit Low

PTO Speed Selector Sensor/Switch 1 Circuit High

PTO Speed Selector Sensor/Switch 1 Circuit Intermittent/Erratic

Hybrid hood switch faults arise when the two signals agree

Torque Management Request Input Signal B Low

Torque Management Request Input Signal B High

Throttle/Fuel Inhibit A Circuit

Throttle/Fuel Inhibit A Circuit Range/Performance

Throttle/Fuel Inhibit A Circuit Low

Throttle/Fuel Inhibit A Circuit High

a coolant-level label can lead to the N493 temperature-control circuit

Engine Coolant Level Sensor/Switch Circuit Range/Performance

Engine Coolant Level Sensor/Switch Circuit Low

Engine Coolant Level Sensor/Switch Circuit High

PTO Speed Selector Sensor/Switch 2 Circuit/Open

PTO Speed Selector Sensor/Switch 2 Range/Performance

PTO Speed Selector Sensor/Switch 2 Circuit Low

PTO Speed Selector Sensor/Switch 2 Circuit High

PTO Speed Selector Sensor/Switch 2 Circuit Intermittent/Erratic

A/C Request A Circuit Range/Performance

Ford low-coolant check inferred from oil and coolant temperatures

A/C Control Module Requested MIL Illumination

Sportage turbo actuator feedback: temperature-dependent adjustment and reflash

Turbo vane position differs from the commanded target

turbo VGT SENT position input below its electrical range

turbo VGT SENT position input above its electrical range

Turbocharger Boost Control Position Sensor A Circuit Intermittent

Direct Ozone Reduction Catalyst Temperature Sensor Circuit

G611 radiator identification is more than temperature feedback

Direct Ozone Reduction Catalyst Temperature Sensor Circuit Low

Engine Idle Speed Selector Sensor/Switch Circuit/Open

Engine Idle Speed Selector Sensor/Switch Range/Performance

Engine Idle Speed Selector Sensor/Switch Circuit Low

Engine Idle Speed Selector Sensor/Switch Circuit High

Engine Idle Speed Selector Sensor/Switch Circuit Intermittent/Erratic

A/C Request B Circuit Range/Performance

Direct Ozone Reduction Catalyst Temperature Sensor Circuit High

Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic

Direct Ozone Reduction Catalyst Deterioration Sensor Circuit

Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance

Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Low

Direct Ozone Reduction Catalyst Deterioration Sensor Circuit High

Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Intermittent/Erratic

Direct Ozone Reduction Catalyst Efficiency Below Threshold

Supercharger clutch command and rotation disagree

Turbo-speed plausibility is a difference test, not overspeed

Vacuum Reservoir Control Circuit/Open

Vacuum Reservoir Control Circuit Low

Vacuum Reservoir Control Circuit High

Hood-switch signal falls into an invalid intermediate range

Hood-switch signal is below the configured lower limit

Hood-switch input exceeds its configured electrical range

A turbo-speed input stuck low must also lack pulse progress