: The Engine Control Unit (ECU) or Transmission Control Unit (TCU) has lost or received invalid data regarding the brake pedal status.
Unlike its predecessors, the DF357 debuted a fully integrated Rencléctronic digital engine management system. While other teams were still wrestling with analog Motronic systems, Renault’s unit could monitor knock, boost, and fuel mixture hundreds of times per second. It was notoriously fragile—electrical gremlins cost Lotus several podiums in 1985—but when it worked, the DF357 was brutally efficient.
: The amber "Check Engine" light, "Check Injection" prompt, or the multi-function wrench symbol will appear on the instrument cluster.
A few owners dealing with DF357 have noted additional problems. Because the ABS system is connected to the engine control unit to reduce power when wheel slip is detected, some have reported that when DF357 is present, the car may hesitate or feel like it's "missing a beat" after highway driving, as if the fuel supply is being briefly interrupted. Also, multiple owners have reported that the Stop/Start system becomes unavailable when this code is active. renault df357
In rarer cases, the internal electronics of the ABS unit itself can fail, leading to an incorrect voltage reading. How to Diagnose and Fix DF357
| Fault Code | Description | Primary System | Typical Solution | | :--- | :--- | :--- | :--- | | | Invalid data received from adaptive cruise control | ABS/ESP Module | Check battery, grounds, ACC radar, wiring to ABS. | | DF001 | Computer power supply, open circuit or short to +12v | ABS/ESP Module | Check and secure main battery connections, alternator, and ABS module fuse/relay. | | DF118 | Multiple rear wheel speed signal, right and left inconsistency | ABS/ESP Module | Inspect, clean, or replace a faulty rear wheel speed sensor or reluctor ring. | | U0235 | Lost communication with cruise control front distance range sensor | Communication (CAN Bus) | Check wiring and connections to the front radar sensor. | | U1000 | Class 2 Communication Malfunction (SCP - J1850) | Communication (CAN Bus) | Indicates a general communication failure on a specific network bus. Requires global CAN bus diagnostics. |
The physical switch or dual-stage sensor at the pedal fails to send a reliable open/closed signal. : The Engine Control Unit (ECU) or Transmission
The Renault Df357 is designed to deliver exceptional performance and fuel efficiency. Its 7.2-liter engine provides plenty of power and torque, making it well-suited for demanding applications. The truck's advanced transmission system and aerodynamic design also contribute to its excellent fuel efficiency, which can help fleet owners and operators reduce their operating costs.
: This error directly impacts the cruise control, start-stop engine function, and automated transmission shifting patterns. Common Symptoms of Fault Code DF357
The diagnostic trouble code is a manufacturer-specific fault code primarily associated with the electronic control systems of modern Renault passenger and commercial vehicles. When triggered, it indicates an electrical circuit anomaly or data signal mismatch detected by the Engine Control Unit (ECU) or the Injection Control Module. Understanding the nuances of the DF357 code helps automotive technicians and owners isolate the underlying fault, restore vehicle driveability, and clear the dashboard warning indicators. Technical Context of Renault DF-Series Codes Because the ABS system is connected to the
This article provides a comprehensive overview of the error, analyzing its common causes, symptoms, and potential solutions to help you get your car back on the road. What is Renault Fault Code DF357?
Standard vehicle diagnostics rely on generic OBD2 "P-codes" (such as P0300 or P0420). However, French automotive manufacturer Renault employs its own proprietary "DF" (Diagnostic Fault) numbering scheme alongside these standard protocols.