If cleaning fails, the solder joints are cracked. Open the instrument cluster casing (small clips or screws). Locate the large rectangular microcontroller (often an STMicroelectronics or Renesas chip). Use a magnifying glass to inspect the pins – you’ll see tiny dark rings around some pins. With a fine-tip soldering iron (350°C) and flux, reflow each pin of the microcontroller and the CAN transceiver (usually an MCP2551 or TJA1050). Add a small amount of fresh solder.
| Renault DF045 | Equivalent OBD2 | Meaning | | :--- | :--- | :--- | | DF045 (Diesel) | P2452 / P2453 | DPF Differential Pressure Sensor Circuit | | DF045 (Petrol) | P0235 / P0236 | Turbocharger Boost Sensor Plausibility | df045 renault scenic
In plain English: the central computer (UPC or UCH) has lost reliable communication with the instrument cluster (your speedometer and warning light panel) via the (Controller Area Network). If cleaning fails, the solder joints are cracked