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Federal filingsHome›Trouble codes› C1001
Diagnostic trouble code

C1001

6 owner reports and 353 manufacturer filings across 86 model years from Ford, Lincoln, Mazda.

Chassis Manufacturer-specific 353 manufacturer filings 6 owner reports

Where C1001 shows up

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reportsParts
2016 Mazda Mazda6Electrical System14—Battery →
2016 Mazda CX-3Electrical System13—Battery →
2021 Ford F-150Electrical System12—Battery →
2016 Mazda CX-5Electrical System12—Battery →
2016 Mazda MX-5Electrical System11—Battery →
2021 Ford Mustang Mach-EElectrical System10—Battery →
2017 Mazda CX-5Forward Collision Avoidance9—
2016 Mazda CX-9Forward Collision Avoidance9—
2018 Mazda Mazda3Forward Collision Avoidance72
2017 Mazda Mazda3Forward Collision Avoidance9—
2016 Mazda Mazda3Forward Collision Avoidance9—
2017 Mazda Mazda6Forward Collision Avoidance9—
2022 Ford Mustang Mach-EEquipment8—
2017 Mazda CX-3Forward Collision Avoidance8—
2018 Mazda CX-5Forward Collision Avoidance71
2017 Mazda CX-9Forward Collision Avoidance8—
2017 Mazda MX-5Forward Collision Avoidance8—
2018 Mazda CX-3Forward Collision Avoidance7—
2018 Mazda CX-9Forward Collision Avoidance7—
2018 Mazda MX-5Forward Collision Avoidance7—
2018 Mazda Mazda6Forward Collision Avoidance7—
2022 Ford F-150Equipment6—
2019 Mazda CX-3Forward Collision Avoidance6—
2019 Mazda CX-5Forward Collision Avoidance6—
2019 Mazda CX-9Forward Collision Avoidance6—

Showing the 25 model years where C1001 appears most; it is on file for 86 in total.

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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C1001 by make

The same record, one make at a time: the model years, bulletins and owner reports that name C1001 on that maker’s vehicles.

Mazda 70Ford 15

What it gets filed under

Forward Collision Avoidance 83 Electrical System 74 Not specified 53 Equipment Adaptive/Mobility 22 Lane Departure 21 Exterior Lighting 16

What owners said

Source: NHTSA complaint database

Owners’ own words, one per nameplate, scrubbed of anything identifying. These are unverified reports filed with NHTSA — they are what was said, not a finding that it was true.

#XXX, 63,180 mi): camera at fault, DTC C1001, no repair available, bulletin only tentatively planned Dec 2027, released unrepaired at no charge
2019 Ford Flex Oct 29, 2026 NHTSA owner report
The repair documentation states that Diagnostic Trouble Code C1001:01 was present, wiring tests were performed, voltage was present, and the recall remedy was to replace the rearview camera
2017 Ford Expedition Jul 2, 2026 NHTSA owner report
2.Car goes into Limp mode when going up a hill 3.Between 46-48 mph, car hesitates when accelerating 4.Between 56-60 mph, car hesitates when accelerating 5.Error Codes received per Lake Car Care: P2299, C1001, B1303 I brought the car to…
2018 Mazda CX-5 Aug 21, 2024 NHTSA owner report
The contact had taken the vehicle to a non-manufacturer dealer who used a handheld scanner and retrieved the following codes: C1001 Type 97, U3003, and B13D3
2018 Mazda Mazda3 at 31,321 miles Apr 15, 2024 NHTSA owner report
Error code (per dealership, C1001 I think but may be incorrect code) indicates a problem with the wiring that connects the camera to the center console
2017 Ford Mustang at 45,000 miles Apr 6, 2021 NHTSA owner report

353 manufacturer filings name C1001. 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.

Photo: Compagnons / Unsplash

Manufacturer filings that name it

Source: NHTSA manufacturer communications

Service bulletins and campaigns whose filed summary names C1001.

What C1001 means

Source: SAE J2012 / OBD-II

C1001 is a manufacturer-specific code: the second character is a 1, which under the OBD-II standard hands the definition to whoever built the vehicle. The same code can mean one thing on a Ford and something unrelated on a Hyundai. Any site that prints a single definition for it is guessing.

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.

From here

Common questions about C1001

Source: NHTSA files and the OBD-II standard

Why does this page not define C1001?

Because it cannot be defined honestly. The second character of a trouble code says who owns its meaning, and a 1 or a 3 hands that to the manufacturer. Sites that print one definition for a manufacturer-specific code are showing you one automaker's meaning and hoping it is yours.

Can I keep driving with C1001 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.