Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Ford Mustang Mach 1, Standard TransFACTORY OEM SERVICE PROCEDURE
Dual Automatic Temperature Control (DATC)
| DTC | Description | Action |
|---|---|---|
| B105A:12 | Cabin Temperature Sensor Fan: Circuit Short To Battery | GO to Pinpoint Test M |
| B105A:14 | Cabin Temperature Sensor Fan: Circuit Short To Ground or Open | GO to Pinpoint Test M |
| B1081:07 | Left Temperature Damper Motor: Mechanical Failure | GO to Pinpoint Test H |
| B1081:11 | Left Temperature Damper Motor: Circuit Short To Ground | GO to Pinpoint Test H |
| B1081:12 | Left Temperature Damper Motor: Circuit Short To Battery | GO to Pinpoint Test H |
| B1081:13 | Left Temperature Damper Motor: Circuit Open | GO to Pinpoint Test H |
| B1082:07 | Right Temperature Damper Motor: Mechanical Failure | GO to Pinpoint Test I |
| B1082:11 | Right Temperature Damper Motor: Circuit Short To Ground | GO to Pinpoint Test I |
| B1082:12 | Right Temperature Damper Motor: Circuit Short To Battery | GO to Pinpoint Test I |
| B1082:13 | Right Temperature Damper Motor: Circuit Open | GO to Pinpoint Test I |
| B1083:07 | Recirculation Damper Motor: Mechanical Failure | GO to Pinpoint Test C |
| B1083:11 | Recirculation Damper Motor: Circuit Short To Ground | GO to Pinpoint Test C |
| B1083:12 | Recirculation Damper Motor: Circuit Short To Battery | GO to Pinpoint Test C |
| B1083:13 | Recirculation Damper Motor: Circuit Open | GO to Pinpoint Test C |
| B1086:07 | Air Distribution Damper Motor: Mechanical Failure | GO to Pinpoint Test D |
| B1086:11 | Air Distribution Damper Motor: Circuit Short To Ground | GO to Pinpoint Test D |
| B1086:12 | Air Distribution Damper Motor: Circuit Short To Battery | GO to Pinpoint Test D |
| B1086:13 | Air Distribution Damper Motor: Circuit Open | GO to Pinpoint Test D |
| B10AF:11 | Blower Fan Relay: Circuit Short To Ground | GO to Pinpoint Test J |
| B10AF:15 | Blower Fan Relay: Circuit Short To Battery or Open | GO to Pinpoint Test J |
| B10AF:15 | Blower Fan Relay: Circuit Short To Battery or Open | GO to Pinpoint Test K |
| B10B5:11 | Left Panel Air Discharge Temperature: Circuit Short To Ground | GO to Pinpoint Test L |
| B10B5:15 | Left Panel Air Discharge Temperature: Circuit Short To Battery or Open | GO to Pinpoint Test L |
| B10B6:11 | Left Floor Air Discharge Temperature: Circuit Short To Ground | GO to Pinpoint Test L |
| B10B6:15 | Left Floor Air Discharge Temperature: Circuit Short To Battery or Open | GO to Pinpoint Test L |
| B10B9:12 | Blower Control: Circuit Short To Battery | GO to Pinpoint Test J |
| B10B9:14 | Blower Control: Circuit Short To Ground or Open | GO to Pinpoint Test J |
| B10B9:14 | Blower Control: Circuit Short To Ground or Open | GO to Pinpoint Test K |
| B11E5:12 | Left HVAC Damper Position Sensor: Circuit Short To Battery | GO to Pinpoint Test H |
| B11E5:14 | Left HVAC Damper Position Sensor: Circuit Short To Ground or Open | GO to Pinpoint Test H |
| B11E6:12 | Right HVAC Damper Position Sensor: Circuit Short To Battery | GO to Pinpoint Test I |
| B11E6:14 | Right HVAC Damper Position Sensor: Circuit Short To Ground or Open | GO to Pinpoint Test I |
| B11E7:12 | Air Distribution Damper Position Sensor: Circuit Short To Battery | GO to Pinpoint Test D |
| B11E7:14 | Air Distribution Damper Position Sensor: Circuit Short to Ground or Open | GO to Pinpoint Test D |
| B11F0:12 | Air Intake Damper Position Sensor: Circuit Short to Battery | GO to Pinpoint Test C |
| B11F0:14 | Air Intake Damper Position Sensor: Circuit Short To Ground or Open | GO to Pinpoint Test C |
| B1A61:11 | Cabin Temperature Sensor: Circuit Short To Ground | GO to Pinpoint Test M |
| B1A61:15 | Cabin Temperature Sensor: Circuit Short To Battery or Open | GO to Pinpoint Test M |
| B1A63:11 | Right Solar Sensor: Circuit Short To Ground | GO to Pinpoint Test N |
| B1A63:15 | Right Solar Sensor: Circuit Short To Battery or Open | GO to Pinpoint Test N |
| B1A64:11 | Left Solar Sensor: Circuit Short To Ground | GO to Pinpoint Test N |
| B1A64:15 | Left Solar Sensor: Circuit Short To Battery or Open | GO to Pinpoint Test N |
| B1A69:12 | Humidity Sensor: Circuit Short To Battery | GO to Pinpoint Test M |
| B1A69:14 | Humidity Sensor: Circuit Short To Ground or Open | GO to Pinpoint Test M |
| B1B71:11 | Evaporator Temperature Sensor: Circuit Short To Ground | GO to Pinpoint Test O |
| B1B71:15 | Evaporator Temperature Sensor: Circuit Short To Battery or Open | GO to Pinpoint Test O |
| C1B14:11 | Sensor Supply Voltage A: Circuit Short to Ground | GO to Pinpoint Test P |
| C1B14:12 | Sensor Supply Voltage A: Circuit Short to Battery | GO to Pinpoint Test P |
| P0532:00 | A/C Refrigerant Pressure Sensor A Circuit Low: No Sub Type Information | GO to Pinpoint Test A |
| P0533:00 | A/C Refrigerant Pressure Sensor A Circuit High: No Sub Type Information | GO to Pinpoint Test A |
| P0645:00 | A/C Clutch Relay Control Circuit: No Sub Type Information | GO to Pinpoint Test B |
| P06A0:00 | Variable Compressor Control Circuit: No Sub Type Information | GO to Pinpoint Test Q |
| P1464:00 | A/C Demand Out Of Self Test Range: No Sub Type Information | GO to Pinpoint Test G |
| P193E:00 | A/C Clutch Request Signal: No Sub Type Information | GO to Pinpoint Test R |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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