Diagnostic article Generic OBD-II
P0C29: The pump performance category combines current and speed evidence
Understand Ford P0C29 and why its detailed suffix can describe a different ATFP result from the generic base code.
Read before applying this article
Documented application
Ford 2024–2025 gasoline OBD operation summary, July 16 2024 revision; only the cited monitor and transmission architectures. No individual vehicle fitment or universal calibration is inferred.
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.
P0C29 is Ford's combined auxiliary transmission-fluid pump current-and-speed out-of-range report when paired with P0C29_92. That combination is more specific than a broad description of driver-circuit performance. Both types of operating information matter to the documented category.
The base identifier can appear with different details
The same table uses P0C29_B1 and _B2 for the overspeed or underspeed representations associated with P0B0D. It also uses _4B for an overtemperature report. A scan result reduced to the base P0C29 family can therefore conceal which operating condition was actually reported.
Undercurrent and overcurrent alone have their own displayed codes. The combined _92 category should not be inferred merely because one current-related fault exists, nor should it be silently rewritten as a simple speed error.
Keep communication quality separate
Ford separately monitors the feedback signal's frequency and duty cycle. A well-formed waveform does not establish that the operating status encoded in it is normal. Conversely, an invalid feedback signal requires its own investigation before decoded data is interpreted uncritically.
Preserve the full suffix, pump command and available current/speed reports. The source gives no universal numeric combined-performance boundary or proof of a defective driver module. The matching pump-control procedure must resolve the specific operating report before component replacement is justified.
Source and applicability
Ford 2024–2025 gasoline OBD operation summary, July 16 2024 revision; only the cited monitor and transmission architectures. No individual vehicle fitment or universal calibration is inferred. Ford PDF, page 156. Ford PDF, page 160.
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
Electric/Auxiliary Transmission Fluid Pump A Driver Circuit Performance
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