Renault | Df455
Renault Fault Code: DF455
Description: Turbocharging pressure regulation - Circuit malfunction / Control deviation.
Common Causes:
Symptoms:
Commonly Affected Models:
Diagnostic Steps:
In the Renault diagnostic ecosystem, DF-series codes are manufacturer-specific, often providing more granular data than generic OBD-II "P-codes." renault df455
Primary Meaning: The code is most commonly defined as "Injection - Low fuel level signal". It alerts the Engine Control Unit (ECU) that the fuel level in the tank has reached a critical minimum or that the signal from the fuel level sensor is inconsistent.
Alternative Definitions: In some older or specific system configurations, it has also been linked to a Power Steering Pressure (PSP) Switch malfunction during self-tests. Symptoms and Behavior
Warning Lights: The presence of DF455 often triggers the "Check Injection" or "Service" light on the dashboard. Symptoms:
Intermittent Nature: Owners frequently report that the code may appear "active" when the engine is off but move to "stored" or "memorized" once the vehicle is running.
Limp Mode: Depending on the severity and accompanying codes (like DF436 for misfires), the car may enter a "limp home" mode to protect the engine. Potential Causes
Because it is indirect injection, the DF455 requires a functioning glow plug system for cold starts. The glow plugs are pencil-type (Bosch Duraterm) and are controlled by a simple relay. A common upgrade is to a push-button manual glow system if the factory timer fails. Commonly Affected Models:
This document is a concise, practical technical-and-history profile of the Renault DF455 diesel engine—covering its development context, core specifications, mechanical design features, common applications, performance characteristics, common failures and troubleshooting, maintenance recommendations, and parts/upgrade considerations. It's written for mechanics, restorers, fleet managers, and engineers who need a single, actionable reference.
