Diagnostic article Generic OBD-II
P0782: The second-to-third shift fails its speed plausibility check
BMW P0782 compares transmission speed behavior across the second-to-third shift.
Read before applying this article
Documented application
BMW OBD II Requirements Summary Table, test groups 3BMXV02.2M5R/3BMXV03.0LER (LEV; excludes listed Z4 2.5i) and 3BMXV03.0M5R/3BMXT03.0E5R (ULEV; excludes listed Z4 3.0i), reproduced under 2003 330i E46 M54. Match actual emissions group and transmission.
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.
The BMW summary table classifies P0782 as a rationality problem during the second-to-third shift. It uses transmission input/output information to evaluate whether the expected change has occurred. This is a shift-performance observation, not an electrical identification of a particular solenoid.
The shift event supplies the evidence
The row applies when the selector is outside Park, Neutral, and Reverse and output speed exceeds 500 rpm. Its monitoring interval is 90 milliseconds, continuously evaluated. These conditions explain why operating the selector while stationary is not equivalent to testing the monitored shift.
The printed comparison relates input speed in the old gear to input speed in the new gear, using a 40-rpm offset. Because it is presented as a compact inequality without a full timing diagram, it should not be converted into a universal workshop slip limit. What is clear is that the controller is judging speed change across the requested gear transition.
What the code cannot isolate
An abnormal transition can require investigation of the transmission's control, hydraulic operation, and speed information, but this table does not rank causes or prescribe a valve-body replacement. It also distinguishes P0782 from a separate excessive-value entry for the same shift.
The emissions-lamp column specifies two driving cycles. Verification should establish correct behavior during the actual second-to-third transition, using the identified transmission and calibration. A code erase or a normal first-to-second shift does not address this particular monitor. The table is a monitor summary, not a complete transmission repair tree.
Source and applicability
BMW diagnostic chart, P0782. BMW OBD II Requirements Summary Table, test groups 3BMXV02.2M5R/3BMXV03.0LER (LEV; excludes listed Z4 2.5i) and 3BMXV03.0M5R/3BMXT03.0E5R (ULEV; excludes listed Z4 3.0i), reproduced under 2003 330i E46 M54. Match actual emissions group and transmission. 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
2-3 Shift
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