2021 Ford Explorer STFACTORY 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 I 
PCM P025B:00 Fuel Pump Module "A" Control Circuit Range/Performance: No Sub Type Information GO to Pinpoint Test I 
PCM P025C:00 Fuel Pump Module "A" Control Circuit Low: No Sub Type Information GO to Pinpoint Test I 
PCM P025D:00 Fuel Pump Module "A" Control Circuit High: No Sub Type Information GO to Pinpoint Test I 
PCM P027B:00 Fuel Pump Module "B" Control Circuit Range/Performance: No Sub Type Information GO to Pinpoint Test I 
PCM P0521:00 Engine Oil Pressure Sensor/Switch "A" Circuit Range/Performance: No Sub Type Information GO to Pinpoint Test J 
PCM P0524:00 Engine Oil Pressure Too Low: No Sub Type Information GO to Pinpoint Test J 
PCM P06DA:00 Engine Oil Pressure Control Circuit/Open: No Sub Type Information GO to Pinpoint Test K 
PCM P06DB:00 Engine Oil Pressure Control Circuit Low: No Sub Type Information GO to Pinpoint Test K 
PCM P06DC:00 Engine Oil Pressure Control Circuit High: No Sub Type Information GO to Pinpoint Test K 
PCM P06DD:00 Engine Oil Pressure Control Circuit Performance/Stuck Off: No Sub Type Information GO to Pinpoint Test J 
PCM P06DE:00 Engine Oil Pressure Control Circuit Stuck On: No Sub Type Information GO to Pinpoint Test J 
PCM P06E9:00 Engine Starter Performance: No Sub Type Information GO to Pinpoint Test L 
PCM P1001:00 KOER Not Able to Complete, KOER Aborted: No Sub Type Information GO to Pinpoint Test M 
PCM P166A:00 Restraints Deployment Communication Circuit: No Sub Type Information GO to Pinpoint Test N 
PCM U0121:00 Lost Communication With Anti-Lock Brake System (ABS) Control Module "A": No Sub Type Information GO to Pinpoint Test A 
PCM U0126:00 Lost Communication With Steering Angle Sensor Module: No Sub Type Information GO to Pinpoint Test B 
PCM U0151:00 Lost Communication With Restraints Control Module: No Sub Type Information GO to Pinpoint Test C 
PCM U0212:00 Lost Communication With Steering Column Control Module: No Sub Type Information GO to Pinpoint Test B 
PCM U0230:00 Lost Communication With Rear Gate Module: No Sub Type Information GO to Pinpoint Test D 
PCM U023A:00 Lost Communication With Image Processing Module A: No Sub Type Information GO to Pinpoint Test E 
PCM U0252:00 Lost Communication With Lighting Control Module- Rear "B": No Sub Type Information GO to Pinpoint Test F 
PCM U0253:00 Lost Communication With Accessory Protocol Interface Module: No Sub Type Information GO to Pinpoint Test G 
PCM U0404:00 Invalid Data Received from Gear Shift Control Module A: No Sub Type Information GO to Pinpoint Test H 
PCM U0405:00 Invalid Data Received From Cruise Control Module: No Sub Type Information GO to Pinpoint Test H 
PCM U0416:00 Invalid Data Received From Vehicle Dynamics Control Module: No Sub Type Information GO to Pinpoint Test H 
PCM U0428:00 Invalid Data Received From Steering Angle Sensor Module: No Sub Type Information GO to Pinpoint Test H 
PCM U1014:00 Invalid Internal Control Module Monitoring Data Received from Restraints Control Module: No Sub Type Information GO to Pinpoint Test H 
PCM U102F:00 Invalid Internal Control Module Monitoring Data Received From All Wheel Drive Control Module: No Sub Type Information GO to Pinpoint Test H 
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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