| 2 to 1 false neutral | 1st Gear and the 2→1 False Neutral |
| Actuator rod | Actuator Rod Length and Cylinder Alignment |
| Air leak | Finding an air leak |
| Asymmetric shifts | Asymmetric Shifts: One Direction Weaker · Shifter Cylinder Alignment |
| Bench test | Manual Pneumatic Shift Test |
| Bisect fault | Manual Pneumatic Shift Test |
| Blaming the car | Check Driver |
| Blip cylinder | Blip Cylinder Air Supply (Gen1 cable throttle) |
| Bogged corner exit | 1st Gear and the 2→1 False Neutral |
| Brake light failure | Brake-light pressure sensor |
| Brake lights not working | Brake-light pressure sensor |
| Cable throttle | Blip Cylinder Air Supply (Gen1 cable throttle) |
| Can’t find neutral | Can’t Find Neutral with the Engine Running |
| Check clutch switch | Clutch Switch |
| Check oil fill | Oil System Health (RPM-Based) |
| Check oil pump | Oil System Health (RPM-Based) |
| Clutch switch | Clutch Switch (Gen2 DBW) |
| Compressor cycling v3 | Watching the compressor and tank pressure |
| Compressor running constantly | Compressor Issues |
| Compressor runs constantly v3 | Watching the compressor and tank pressure |
| Compressor short cycling | Compressor Issues |
| Compressor won’t run | Compressor Issues |
| Cylinder alignment | Actuator Rod Length and Cylinder Alignment |
| Cylinder misaligned | Shifter Cylinder Alignment |
| Dead paddles | Nothing Works: No Shifts, No Compressor |
| Dropped shift | Missed or Incomplete Shifts (Both Directions) |
| Erratic shifts | GCU Water Intrusion |
| False neutral v3 | Capturing a log |
| GCU dead | Nothing Works: No Shifts, No Compressor |
| GCU log pull | Capturing a log |
| GCU reboot | Crash and reboot triage |
| GCU resets mid shift | Crash and reboot triage |
| GCU water | GCU Water Intrusion |
| Gearshift sensor mimic | Gearshift Sensor Mimic (Gen2 DBW) |
| Gen1 | Blip Cylinder Air Supply (Gen1 cable throttle) |
| Gen2 | Clutch Switch (Gen2 DBW) · Gearshift Sensor Mimic (Gen2 DBW) · Speed Emulator (Gen2 DBW) |
| Gss mimic | Gearshift Sensor Mimic (Gen2 DBW) |
| High oil pressure | Oil Pressure |
| High water temp | Water Temperature |
| Hiss after shift | Asymmetric Shifts: One Direction Weaker |
| Hissing tank | Finding an air leak |
| Intermittent shifts | Missed or Incomplete Shifts (Both Directions) |
| Limp mode | Clutch Switch (Gen2 DBW) · Speed Emulator (Gen2 DBW) |
| Low OilP ratio | Oil System Health (RPM-Based) |
| Low oil pressure | Oil Pressure |
| Manual shift | Manual Pneumatic Shift Test |
| Mechanical binding | Shift Arm |
| Missed shift v3 | Capturing a log |
| Missed shifts | Missed or Incomplete Shifts (Both Directions) |
| Muffled shift | Asymmetric Shifts: One Direction Weaker |
| Neutral but no crank | Car Won’t Start — Dash Shows N but Engine Won’t Crank |
| Neutral with engine on | Can’t Find Neutral with the Engine Running |
| No blip | Blip Cylinder Air Supply (Gen1 cable throttle) · Clutch Switch (Gen2 DBW) · Gearshift Sensor Mimic (Gen2 DBW) |
| No compressor | Nothing Works: No Shifts, No Compressor |
| No crank | Car Won’t Start — Dash Shows N but Engine Won’t Crank |
| No cut | Gearshift Sensor Mimic (Gen2 DBW) |
| No shifts | Nothing Works: No Shifts, No Compressor |
| Not fast enough | Check Driver |
| OilP sender failed | Oil System Health (RPM-Based) |
| One direction dead | One Paddle Direction Doesn’t Respond |
| Overheating | Water Temperature |
| Paddle dead | One Paddle Direction Doesn’t Respond |
| Pneumatic test | Manual Pneumatic Shift Test |
| Rev limited in neutral | 1st Gear and the 2→1 False Neutral |
| Shift arm | Shift Arm |
| Slow lap times | Check Driver |
| Slow pressure loss | Finding an air leak |
| Speed emulator | Speed Emulator (Gen2 DBW) |
| Stuck clutch switch | Clutch Switch |
| Stuck in neutral on downshift | 1st Gear and the 2→1 False Neutral |
| Throttle capped | Speed Emulator (Gen2 DBW) |
| Very high oil pressure | Oil Pressure |
| Very high water temp | Water Temperature |
| Water intrusion | GCU Water Intrusion |
| Weak downshift | Asymmetric Shifts: One Direction Weaker · Shifter Cylinder Alignment |
| Weak upshift | Asymmetric Shifts: One Direction Weaker · Shifter Cylinder Alignment |
| Won’t start | Car Won’t Start — Dash Shows N but Engine Won’t Crank |
