C0604
0 owner reports and 24 manufacturer filings across 9 model years from Ford, Ram.
Where C0604 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports | Parts |
|---|---|---|---|---|
| 2023 Ford F-150 | Power Train | 6 | — | |
| 2022 Ford F-150 | Power Train | 6 | — | |
| 2021 Ford F-150 | Power Train | 6 | — | |
| 2026 Ford F-150 | Electrical System | 1 | — | Battery → |
| 2025 Ford F-150 | Power Train | 1 | — | |
| 2023 Ford F-150 Lightning | Power Train | 1 | — | |
| 2022 Ford F-150 Lightning | Power Train | 1 | — | |
| 2025 Ram 1500 | Structure | 1 | — | |
| 2024 Ram 1500 | Structure | 1 | — |
A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.
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C0604 by make
The same record, one make at a time: the model years, bulletins and owner reports that name C0604 on that maker’s vehicles.
What it gets filed under
24 manufacturer filings name C0604. Start with what the maker wrote down.
A code names the test that failed, not the part. A bulletin that names it is often a diagnosis someone has already written down — quote its number at the service desk.
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names C0604.
- TSB 26-2448 Service bulletin2026-10-27 · 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
- S2523000076 Service bulletin2025-08-22 · Structure — Body
- Active Air Dam Diagnostic Trouble Codes (DTC) U0645, C0604.
- TSB 25-2236 Service bulletin2025-06-02 · 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
- TSB 24-2404 Service bulletin2024-11-26 · 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
- SSM 52349 Service bulletin2024-03-12 · 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
- SSM 51718 Service bulletin2023-06-15 · 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
What C0604 means
Source: SAE J2012 / OBD-IIC0604 sits in the generic range of the OBD-II standard, so it means the same thing on every vehicle sold in the United States — but WhichTrim does not carry a definition for it and will not invent one. What is on this page is the record: who named it and on what.
A stored code names the test that failed, never the part that caused it. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.
Common questions about C0604
Source: NHTSA files and the OBD-II standardCan I keep driving with C0604 stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light means a fault was logged and the car should be checked soon; a flashing light means a severe misfire — slow down and get it seen as soon as possible, because severe misfire can quickly damage the catalytic converter. The safe read of this page is the mileage and the components, not permission.
Does a code mean the car is recalled?
No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.
Why do the counts here differ from other sites?
Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.
Will clearing the code fix it?
Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.