P0645 A fault in the air conditioning clutch relay circuit
0 owner reports and 15 manufacturer filings across 9 model years from Ford, Lincoln.
Where P0645 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports | Parts |
|---|---|---|---|---|
| 2018 Ford Escape | Electrical System | 4 | — | Battery → |
| 2017 Ford Escape | Electrical System | 4 | — | Battery → |
| 2016 Ford Fiesta | Power Train | 1 | — | |
| 2016 Ford Mustang | Equipment | 1 | — | |
| 2016 Ford Taurus | Power Train | 1 | — | |
| 2016 Lincoln MKC | Power Train | 1 | — | |
| 2016 Lincoln MKS | Equipment | 1 | — | |
| 2016 Lincoln MKT | Power Train | 1 | — | |
| 2016 Lincoln Navigator | Power Train | 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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P0645 by make
The same record, one make at a time: the model years, bulletins and owner reports that name P0645 on that maker’s vehicles.
What it gets filed under
15 manufacturer filings name P0645. 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 P0645.
- SSM 47575 Service bulletin2018-10-10 · Equipment
- Some 2017-2018 Escape vehicles equipped with a 1.5L or 2.0L engine may exhibit fuse F34 open, an illuminated MIL with diagnostic trouble codes (DTCs) P0034, P023A, P0245, P0480, P0481, P0645, P06A0, P06DB, P188D, P02602, and/or P2681 in the powertrain control module (PCM). The vehicle may also exhibit an all-wheel drive (AWD) fault warning and/or traction control (TC) light on. Inspect the 12A690
- SSM 47467 Service bulletin2018-08-15 · Electrical System
- Some 2017-2018 Escape vehicles equipped with a 1.5L or 2.0L engine may exhibit fuse F34 open, an illuminated MIL with diagnostic trouble codes (DTCs) P0034, P023A, P0245, P0480, P0481, P0645, P06A0, P06DB, P188D, P02602, and/or P2681 in the powertrain control module (PCM). May also exhibit an all-wheel drive (AWD) fault warning and/or traction control (TC) light on. Inspect the 14290 wiring harnes
- SSM 47086 Service bulletin2018-02-16 · Electrical System — Wiring
- Some 2017-2018 Escape vehicles equipped with a 1.5L or 2.0L engine and built on or before 24-Jan-2018 may exhibit fuse F34 open, an illuminated MIL with diagnostic trouble codes (DTCs) P0034, P023A, P0245, P0480, P0481, P0645, P06A0, P06DB, P188D, P02602, and/or P2681 in the powertrain control module (PCM). May also exhibit an all-wheel drive (AWD) fault warning and/or traction control (TC) light
- SSM-45815 Service bulletin2016-05-11 · Power Train — Automatic Transmission — Control Module (Tcm/Pcm/Tecm)
- AIR CONDITIONING (A/C) INOPERATIVE - DIAGNOSTIC TROUBLE CODE (DTC) P0645
What P0645 means
Source: SAE J2012 / OBD-IIA fault in the air conditioning clutch relay circuit.
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 P0645
Source: NHTSA files and the OBD-II standardCan I keep driving with P0645 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.