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 Explorer TimberlineFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code (DTC) Chart
Diagnostics in this service information assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
Diagnostic Trouble Code Chart
| Module | DTC | Description | Action |
|---|---|---|---|
| PCM | P025A:00 | Fuel Pump Module "A" Control Circuit/Open: No Sub Type Information | GO to Pinpoint Test L |
| PCM | P025B:00 | Fuel Pump Module "A" Control Circuit Range/Performance: No Sub Type Information | GO to Pinpoint Test L |
| PCM | P025C:00 | Fuel Pump Module "A" Control Circuit Low: No Sub Type Information | GO to Pinpoint Test L |
| PCM | P025D:00 | Fuel Pump Module "A" Control Circuit High: No Sub Type Information | GO to Pinpoint Test L |
| PCM | P027B:00 | Fuel Pump Module "B" Control Circuit Range/Performance: No Sub Type Information | GO to Pinpoint Test L |
| PCM | P0521:00 | Engine Oil Pressure Sensor/Switch "A" Circuit Range/Performance: No Sub Type Information | GO to Pinpoint Test M |
| PCM | P0524:00 | Engine Oil Pressure Too Low: No Sub Type Information | GO to Pinpoint Test M |
| PCM | P06DA:00 | Engine Oil Pressure Control Circuit/Open: No Sub Type Information | GO to Pinpoint Test N |
| PCM | P06DB:00 | Engine Oil Pressure Control Circuit Low: No Sub Type Information | GO to Pinpoint Test N |
| PCM | P06DC:00 | Engine Oil Pressure Control Circuit High: No Sub Type Information | GO to Pinpoint Test N |
| PCM | P06DD:00 | Engine Oil Pressure Control Circuit Performance/Stuck Off: No Sub Type Information | GO to Pinpoint Test M |
| PCM | P06DE:00 | Engine Oil Pressure Control Circuit Stuck On: No Sub Type Information | GO to Pinpoint Test M |
| PCM | P06E9:00 | Engine Starter Performance: No Sub Type Information | GO to Pinpoint Test O |
| PCM | P1001:00 | KOER Not Able to Complete, KOER Aborted: No Sub Type Information | GO to Pinpoint Test P |
| PCM | P166A:00 | Restraints Deployment Communication Circuit: No Sub Type Information | GO to Pinpoint Test Q |
| PCM | U0103:00 | Lost Communication With Gear Shift Control Module A: No Sub Type Information | GO to Pinpoint Test A |
| PCM | U0121:00 | Lost Communication With Anti-Lock Brake System (ABS) Control Module "A": No Sub Type Information | GO to Pinpoint Test B |
| PCM | U0122:00 | Lost Communication With Vehicle Dynamics Control Module: No Sub Type Information | GO to Pinpoint Test C |
| PCM | U0126:00 | Lost Communication With Steering Angle Sensor Module: No Sub Type Information | GO to Pinpoint Test D |
| PCM | U0151:00 | Lost Communication With Restraints Control Module: No Sub Type Information | GO to Pinpoint Test E |
| PCM | U0164:00 | Lost Communication With HVAC Control Module: No Sub Type Information | GO to Pinpoint Test F |
| PCM | U0212:00 | Lost Communication With Steering Column Control Module: No Sub Type Information | GO to Pinpoint Test D |
| PCM | U0230:00 | Lost Communication With Rear Gate Module: No Sub Type Information | GO to Pinpoint Test G |
| PCM | U023A:00 | Lost Communication With Image Processing Module A: No Sub Type Information | GO to Pinpoint Test H |
| PCM | U0252:00 | Lost Communication With Lighting Control Module- Rear "B": No Sub Type Information | GO to Pinpoint Test I |
| PCM | U0253:00 | Lost Communication With Accessory Protocol Interface Module: No Sub Type Information | GO to Pinpoint Test J |
| PCM | U0404:00 | Invalid Data Received from Gear Shift Control Module A: No Sub Type Information | GO to Pinpoint Test K |
| PCM | U0405:00 | Invalid Data Received From Cruise Control Module: No Sub Type Information | GO to Pinpoint Test K |
| PCM | U0416:00 | Invalid Data Received From Vehicle Dynamics Control Module: No Sub Type Information | GO to Pinpoint Test K |
| PCM | U101E:00 | Invalid Internal Control Module Monitoring Data Received from Gear Shift Module: No Sub Type Information | GO to Pinpoint Test K |
| PCM | U101F:00 | Invalid Internal Control Module Monitoring Data Received from Transmission Range Control Module: No Sub Type Information | GO to Pinpoint Test K |
| PCM | U102F:00 | Invalid Internal Control Module Monitoring Data Received From All Wheel Drive Control Module: No Sub Type Information | GO to Pinpoint Test K |
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.