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.
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HOMESERVICE MANUALSFORD2018F-450 SUPER DUTY LARIAT, 4D PICKUP CREW CAB, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXDTC INDEX (EXTERIOR LIGHTING - INTERIOR LIGHTING)HVAC - CLIMATE CONTROL SYSTEM DTCSDUAL AUTOMATIC TEMPERATURE CONTROL (DATC)PCM
2018 Ford F-450 Super Duty Lariat, 4D Pickup Crew Cab, 4WD
Dual Automatic Temperature Control (DATC): Pcm
2018 Ford F-450 Super Duty Lariat, 4D Pickup Crew Cab, 4WDSECTION Pcm
DTC INDEX
| DTC | Description | Action |
|---|---|---|
| P0532 | A/C Refrigerant Pressure Sensor "A" Circuit Low | GO to Pinpoint Test A |
| P0533 | A/C Refrigerant Pressure Sensor "A" Circuit High | GO to Pinpoint Test A |
| P0645 | A/C Clutch Relay Control Circuit | GO to Pinpoint Test B |
| P0646 | A/C Clutch Relay Control Circuit Low | GO to Pinpoint Test B |
| P0647 | A/C Clutch Relay Control Circuit High | GO to Pinpoint Test B |
| P145B | A/C Demand Not Activated During Self Test | If the HVAC selector was not powered on, POWER the HVAC on, CLEAR the Diagnostic Trouble Codes (DTCs) and REPEAT the self-test. If the DTC returns, GO to Pinpoint Test G |
| P1464 | A/C Demand Out Of Self Test Range | If the HVAC selector was not powered off, POWER the HVAC off, CLEAR the Diagnostic Trouble Codes (DTCs) and REPEAT the self-test. If the DTC returns, GO to Pinpoint Test H |
| P193E | A/C Clutch Request Signal | GO to Pinpoint Test R |
| All Other PCM Diagnostic Trouble Codes (DTCs) | - | For 6.2L V8 PCM DTC Chart, REFER to: Electronic Engine Controls
. For 6.8L Triton-30V - V10 PCM DTC Chart, REFER to: Electronic Engine Controls . For 6.7L Power Stroke Diesel PCM DTC Chart, REFER to: Electronic Engine Controls . |
RENDER: 1.0x
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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.