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.

Active Grille Air Shutter A Position Sensor Circuit Low

Active Grille Air Shutter A Position Sensor Circuit Intermittent

grille-shutter performance uses a retry strategy

Mazda shutter faults from temporary obstruction or cold-weather logic

Grille shutter A endstop diagnosis changes between learning and normal operation

Grille shutter A open-circuit diagnosis includes timed coil checks

Active grille shutter actuator internal fault

Active Grille Air Shutter A Control Circuit High

Active Grille Air Shutter A Control Circuit Low

Active Grille Air Shutter A Supply Voltage Circuit/Open

Grille shutter A reports its internal supply below the allowed level

Active Grille Air Shutter A Supply Voltage Circuit High

Active Grille Air Shutter B Position Sensor Circuit

Active Grille Air Shutter B Position Sensor Circuit Range/Performance

Active Grille Air Shutter B Position Sensor Circuit High

Active Grille Air Shutter B Position Sensor Circuit Low

Active Grille Air Shutter B Position Sensor Circuit Intermittent

shutter B fails commanded-position retries

Active Grille Air Shutter B Stuck On

Why grille shutter B endstop learning changes the diagnosis

The movement-timed coil checks behind grille shutter B faults

Niro air-flap B performance and judgment-logic verification

Active Grille Air Shutter B Control Circuit High

Active Grille Air Shutter B Control Circuit Low

Active Grille Air Shutter B Supply Voltage Circuit/Open

Why grille shutter B can report low internal voltage with normal battery voltage

Active Grille Air Shutter B Supply Voltage Circuit High

Restraint Deployment Signal Circuit/Open

Restraint Deployment Signal Circuit Low

Restraint Deployment Signal Circuit High

Restraints Deployed

Stop-Start Mode Switch Circuit/Open

Ram stop-start switch faults versus the ignition module

Stop-Start Mode Switch Circuit Low

Stop-Start Mode Switch Circuit High

What grille shutter A overtemperature actually measures

Keep grille shutter B thermal faults separate from its other subtypes

Engine Coolant Pressure Sensor Circuit

Engine Coolant Pressure Sensor Circuit Range/Performance

Coolant water-pressure sensor circuit low input

Coolant pressure-sensor circuit high and missing ground possibilities

Engine Coolant Pressure Sensor Circuit Intermittent/Erratic

Economy Mode Switch Circuit/Open

Economy Mode Switch Circuit Range/Performance

Economy Mode Switch Circuit Low

Economy Mode Switch Circuit High

Vehicle Hardware Incompatibility

Cold-start intake timing is compared only during a stable warmup command

Bank-2 intake cam timing fails the cold-start comparison

Exhaust cam error during catalyst warmup needs its own timing window

Bank-2 exhaust cam timing fails during cold start

Driver Mode Select Switch A Circuit

driver-mode switch bank 1 input below its low threshold

driver-mode switch voltage exceeds the documented high limit

driver-mode switch voltage lands between recognized states

Driver Mode Select Switch B Circuit

Driver Mode Select Switch B Circuit Low

Driver Mode Select Switch B Circuit High

Driver Mode Select Switch B Range/Performance

PCV Regulator Valve Control Circuit/Open

PCV Regulator Valve Control Circuit Low

PCV Regulator Valve Control Circuit High

Brake Pedal Position Sensor B Circuit/Open

GM brake-pedal B range and PWM performance

GM brake-pedal B signal stuck low

GM brake-pedal signal B stuck high

GM brake-pedal B signal changes implausibly fast

GM brake-pedal channels disagree

A/C Refrigerant Pressure Sensor A Circuit Intermittent/Erratic

A/C Refrigerant Pressure Sensor B Circuit Intermittent/Erratic

Park Brake Sensor/Switch Circuit

Park Brake Sensor/Switch Circuit Low

Park Brake Sensor/Switch Circuit High

Park Brake Sensor/Switch Circuit Range/Performance

Park Brake Sensor/Switch Circuit Intermittent/Erratic

Engine Oil Bypass Valve Control Circuit/Open

Engine Oil Bypass Valve Control Circuit Low

Engine Oil Bypass Valve Control Circuit High

Cold Start SCR NOx Catalyst Inlet Temperature Too Low

cold-start injection request and scheduling disagree