P0642
1 owner report and 22 manufacturer filings across 13 model years from Bentley, Hyundai, Ram.
Where P0642 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2024 Hyundai Sonata | Engine | 4 | — |
| 2024 Hyundai Tucson | Engine | 4 | — |
| 2024 Bentley Continental | Electrical System | 2 | — |
| 2023 Bentley Continental | Electrical System | 2 | — |
| 2022 Bentley Continental | Electrical System | 2 | — |
| 2021 Bentley Continental | Electrical System | 2 | — |
| 2024 Bentley Flying Spur | Engine | 1 | — |
| 2023 Bentley Flying Spur | Engine | 1 | — |
| 2022 Bentley Flying Spur | Electrical System | 1 | — |
| 2021 Bentley Flying Spur | Engine | 1 | — |
| 2022 Hyundai Tucson | Power Train | — | 1 |
| 2023 Ram 2500 | Engine And Engine Cooling | 1 | — |
| 2023 Ram 3500 | Electrical 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
What owners said
Source: NHTSA complaint databaseOwners’ 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.
System/Component Failed & Inspection: The vehicle suffers from recurring failures across the engine, powertrain, electronic throttle control, and exhaust gas recirculation (EGR) control systems (DTCs P0524, P0642, P2118, P022100)
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names P0642. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.
- 2081243/22026-07-16 · Electrical System
- Service Info: Engine Control Module (ECM) 5V Reference Circuits. Customer statement / workshop findings: This TPI provides supplementary technical information to support diagnosis of ECM 5V reference circuit DTCs. It details the sensors associated with each reference circuit (A, B, and C) and outlines relevant guidance to assist in isolating faults when any of the following DTCs are stored in the
- 25-01-023H DN Service campaign2025-03-13 · Engine
- The exhaust gas recirculation (EGR) valve assembly in certain vehicles may contain a sensor that was contaminated with solder flux during manufacturing, which could potentially result in an electrical short. An electrical short within the EGR valve could lead to a Malfunction Indicator lamp (MIL) illumination (P0405, P0642, P0652, P0404/P049D/P240F). The California Air Resources Board has determin
- 24-01-080H Service campaign2024-09-25 · Engine
- The exhaust gas recirculation (EGR) valve assembly in certain vehicles (listed below) may contain a sensor that was contaminated with solder flux during manufacturing, which could potentially result in an electrical short. An electrical short within the EGR valve could lead to a Malfunction Indicator lamp (MIL) illumination (P0405, P0642, P0652, P0404/P049D/P240F). Follow the information in this b
- 24-01-080H Service campaign2024-09-25 · Engine
- The exhaust gas recirculation (EGR) valve assembly in certain vehicles may contain a sensor that was contaminated with solder flux during manufacturing, which could potentially result in an electrical short. An electrical short within the EGR valve could lead to a Malfunction Indicator lamp (MIL) illumination (P0405, P0642, P0652, P0404/P049D/P240F). The California Air Resources Board has determin
- 18072232023-06-06 · Engine And Engine Cooling
- Engine Control Module (ECM) Capacitor Leak Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that the one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ? P0642 - Sensor Reference Voltage 1 Circuit Low. ? P0652 - Sensor Reference Voltage 2 Low. ? P06D3 - Sensor Reference Voltage 5 Circuit Low. ? P0
What P0642 means
Source: SAE J2012 / OBD-IIP0642 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 P0642
Source: NHTSA files and the OBD-II standardCan I keep driving with P0642 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.