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Diagnostic trouble code

P0123

3 owner reports and 10 manufacturer filings across 5 model years from Dodge, Jeep, Mercedes-Benz.

PowertrainGeneric OBD-II code10 manufacturer filings3 owner reports

Where P0123 shows up

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2016 Dodge ChallengerPower Train5—
2016 Dodge ChargerPower Train5—
2019 Jeep CherokeeEngine—1
2018 Jeep CompassElectrical System—1
2019 Mercedes-Benz C-ClassElectrical System—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.

What it gets filed under

Power Train 7Electrical System 3Back Over Prevention 1Equipment 1Engine 1
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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.

Independent service center confirmed failure on 1/3/2026 with 6 stored fault codes: P2101, P0122, P0222, P0123, P0223, P2135
2019 Mercedes-Benz C-ClassJul 1, 2026NHTSA owner report
Then my engine light went on and i had to have it towed to the nearest mechanic and when they checked the car had 4 codes P0123 P0222 P2111 and U0420
2018 Jeep CompassJul 15, 2022NHTSA owner report

Manufacturer filings that name it

Source: NHTSA manufacturer communications

Service bulletins and campaigns whose filed summary names P0123. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.

What P0123 means

Source: SAE J2012 / OBD-II

Throttle position sensor signal too high.

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 P0123

Source: NHTSA files and the OBD-II standard

Can I keep driving with P0123 stored?

Nobody can answer that from the code alone, and a site that does is guessing. A steady light generally means the fault was logged and the vehicle is in a reduced-risk mode; a flashing light means stop soon, because a misfiring engine can destroy a catalytic converter in minutes. 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.