Diagnostic article Generic OBD-II
P0DF5: Mazda ISG V-phase temperature-sensor voltage is low
Mazda P0DF5:00 identifies a low-input condition in the ISG’s V-phase internal temperature-sensor channel.
Read before applying this article
Documented application
Mazda3 01/2019 onward workshop edition d9n1-1a-22d_ver10, Mazda M Hybrid integrated starter generator internal FET temperature sensors; source procedure references SKYACTIV-G and SKYACTIV-X 2.0; verify vehicle equipment.
The code alone does not identify a failed part or establish that a vehicle is safe to drive. Confirm the vehicle, reporting module and applicable service procedure.
P0DF5:00 is Mazda's V-phase internal FET temperature-sensor low-input entry. It corresponds to generic generator-inverter temperature sensor B circuit low. Mazda specifies input at or below 1.44 V continuously for 0.5 second.
Low input does not mean a cold generator
The code is based on electrical input, and the procedure gives no temperature conversion for that voltage. It therefore cannot establish a particular low or high physical temperature. Its listed possible cause is an ISG malfunction, with no external sensor wiring or connector diagram supplied.
The neighboring characteristic code P0DF4 evaluates disagreement between two internal readings; P0DF5 instead evaluates the lower absolute signal boundary. That distinction should remain visible in the complete fault record.
A past fault and a present fault receive different checks
Mazda first preserves snapshot data and determines whether the entry is current. A present fault is rechecked after ignition cycling and at least ten seconds on. A past fault is assessed for repeatability using the captured operating conditions and recorded ISG/engine speed information.
The shared procedure considers CAN errors before ISG replacement and notes that communication noise can produce a displayed code. A one-time historical entry is therefore not the same evidence as a recurring internal low-input fault.
Hybrid power support, regeneration, assistance, and i-stop can be inhibited by the common fail-safe. Continued running can deplete the 12 V supply. A qualified technician should complete the source's recurrence and communication checks; this page does not authorize internal ISG probing or a separate V-phase sensor replacement.
Source and applicability
Mazda diagnostic chart, P0DF5. Mazda3 01/2019 onward workshop edition d9n1-1a-22d_ver10, Mazda M Hybrid integrated starter generator internal FET temperature sensors; source procedure references SKYACTIV-G and SKYACTIV-X 2.0; verify vehicle equipment. These values describe that documented monitor; they are not universal specifications for every vehicle displaying this code.
Article source documents
Source checks describe how the text was prepared; they do not certify a diagnosis or confirm compatibility with every vehicle using this code.
Original code reference
Dictionary definition
Generator Inverter Temperature Sensor B Circuit Low
This definition retains its original catalog scope. The article above is limited to its explicitly documented application.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT