Diagnostic article Generic OBD-II
P2755: high cooler-control circuit feedback may accompany widespread harness damage
Ross-Tech's P2755 guidance includes coolant migration through N82 and an Audi example with stalling and rich-mixture faults beyond the transmission module.
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Documented application
Ross-Tech independent VAG diagnostic guidance; match complete fault description and controller. Vehicle-specific notes do not establish universal applicability.
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.
P2755 is the high-circuit fault for transmission-fluid cooler control in Ross-Tech's VAG reference. The source names N82, N509 or N488 depending on application, together with wiring and power supply. It also explains why symptoms can extend beyond transmission cooling when coolant enters the electrical harness.
Companion engine faults can be relevant
Ross-Tech describes an Audi A8L example in which N82-related harness damage accompanied P2755 in the transmission controller, intermittent rough running, stalling and rich fuel-trim faults. This is an example of connected damage, not a universal causal rule for rich-mixture codes.
The page advises considering corroded connections at engine, transmission and climate-control modules where applicable. As diagnostic interpretation, the scope of repair should follow actual contamination evidence instead of ending automatically at the first failed valve.
Establish vehicle-specific applicability
The reference includes service campaigns and bulletins covering different models and markets. It does not establish current campaign eligibility, a common harness layout or a requirement to replace all modules. Confirm the installed valve and the relevant manufacturer's guidance. This independent source supports a wider electrical assessment when coolant migration is found; the high-circuit label alone does not prove internal transmission damage or justify a complete harness replacement.
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
Transmission Fluid Cooler Control Circuit High
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