What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P3426Cylinder 4 Deactivation Control PerformanceManufacturer communications
8Original wording in English
FORD
Reported code forms P3426
This article supersedes TSB 25-2487 to update the symptoms in the TSB title and issue, and update the parts list to include additional parts for the repair Some vehicles listed in the Model Section above may exhibit…
FORD
Reported code forms P3426
Some vehicles listed in the Model Section above may exhibit diagnostic trouble codes (DTCs) P3426, P3402, P3450, and/or P3442 stored in the PCM. This may be due to a restriction in the cylinder deactivation solenoid oil…
FORD
Reported code forms P3426
Some 2021 F-150 vehicles equipped with a 5.0L engine and built on or before 23-Apr-2021 may experience a runs rough, hesitation and/or a lack of power condition with an illuminated malfunction indicator lamp (MIL) with…
RAM
Reported code forms P3426
Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. This bulletin fixes all vehicles listed and also contains an optional software path for…
RAM
Reported code forms P3426
Flash: 6.4L Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. A small number of customers may experience a…
RAM
Reported code forms P3426
Flash: 6.4L Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. NOTE: This bulletin fixes all vehicles listed and…
Check vehicle applicability
14A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Ford | F-150 | 2025 |
| Ford | F-150 | 2021 |
| Ram | 2500 | 2018 |
| Ram | 2500 | 2016 |
| Ram | 2500 | 2015 |
| Ram | 3500 | 2018 |
| Ram | 3500 | 2016 |
| Ram | 3500 | 2015 |
| Ram | 4500 | 2018 |
| Ram | 4500 | 2016 |
| Ram | 4500 | 2015 |
| Ram | 5500 | 2018 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.