C0604 on Ford vehicles

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Bulletins and campaigns Ford filed with NHTSA whose summary names C0604. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• SSM 51718 Service bulletin
  2023-06-15 · Power Train
• Some 2021-2023 F-150 vehicles may exhibit DTC C0604:00 stored in the powertrain control module (PCM). This may be due to firmware within the left and/or right active air dam (AAD) actuator. To correct this condition, perform normal workshop manual diagnostics and if the concern is still present, replace the right and left AAD actuators. Refer to Workshop Manual (WSM) Section 501-19 Bumpers, Diagno
• SSM 52349 Service bulletin
  2024-03-12 · Power Train — Automatic Transmission — Control Module (Tcm/Pcm/Tecm)
• Some 2021-2023 F-150 vehicles may exhibit DTC C0604:00 stored in the powertrain control module (PCM) and may have an Active Air Dam System Fault See Manual message displayed in the instrument panel cluster (IPC). To correct this condition, clear and retest for the DTC C0604:00. If DTC C0604:00 returns, refer to Workshop Manual (WSM) Section 501-19 Bumpers, Diagnosis and Testing for additional diag
• TSB 24-2404 Service bulletin
  2024-11-26 · Unknown Or Other
• Some 2021-2023 F-150 vehicles may experience an "Active Air Dam System Fault See Manual" warning message in the IPC and/or DTC C0604:00 stored in the PCM
• TSB 26-2448 Service bulletin
  2026-10-27 · Electrical System
• This bulletin supersedes 25-2236. Reason for update: To consolidate prior articles and revise the Service Procedure to add an AAD blade limit strap. Some of the vehicles listed in the model statement above may exhibit at least one of the following conditions: "Active Air Dam System Fault See Manual" warning message displayed in the instrument panel cluster (IPC) AAD hanging/not retracting Diagn
• TSB 25-2236 Service bulletin
  2025-06-02 · Power Train
• This article supersedes TSB 25-2155 to add labor time for F-150 Lightning. Some of the vehicles listed in the Model statement above may exhibit at least one of the following conditions: * "Active Air Dam System Fault See Manual" warning message in the instrument panel cluster (IPC) * Diagnostic trouble code (DTC) C0604:00 stored in the PCM This may be due to the software level in the powertrain co

A stored code names the test that failed, never the part that caused it. The record above is what Ford and its owners have filed about it; the code’s page across every make has the whole file.