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-150 XLT, 4D PICKUP EXTRA CAB, 3.5L ENG VIN G, RWDREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSCLIMATE CONTROL SYSTEM - GENERAL INFORMATION (2 OF 3)DIAGNOSIS AND TESTINGCLIMATE CONTROL SYSTEM - VEHICLES WITH: ELECTRONIC MANUAL TEMPERATURE CONTROL (EMTC)DTC CHART(S)DTC CHART: POWERTRAIN CONTROL MODULE (PCM)
2018 Ford F-150 XLT, 4D Pickup Extra Cab, 3.5L Eng VIN G, RWD
DTC Chart: Powertrain Control Module (PCM)
2018 Ford F-150 XLT, 4D Pickup Extra Cab, 3.5L Eng VIN G, RWDSECTION DTC Chart: Powertrain Control Module (PCM)
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
NOTE:
Some PCM Diagnostic Trouble Codes (DTCs) may inhibit A/C operation. If any PCM Diagnostic Trouble Codes (DTCs) are retrieved, diagnose those first. Refer to the DTC Chart: PCM below.
| 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 |
| P06A0 | Variable A/C Compressor Control Circuit | GO to Pinpoint Test R |
| 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 N |
| P2600 | Coolant Pump "A" Control Circuit/Open | GO to Pinpoint Test O |
| P2601 | Coolant Pump "A" Control Circuit Performance/Stuck Off | GO to Pinpoint Test O |
| P2602 | Coolant Pump "A" Control Circuit Low | GO to Pinpoint Test O |
| P2603 | Coolant Pump "A" Control Circuit High | GO to Pinpoint Test O |
| All Other PCM Diagnostic Trouble Codes (DTCs) | - | REFER to the appropriate Electronic Engine Controls article, Diagnosis and refer to DTC Chart: Powertrain Control Module (PCM) . |
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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.