The code signifies that the vehicle's computer (ECU) is not receiving the correct security signal to allow the engine to run.
Today, one complete DF037 is rumored to exist in Renault’s heritage collection, hidden in a climate-controlled vault. It is never run. Why? Because its metallurgy was so extreme, its tolerances so tight, that a single start-up would require a team of six engineers to re-calibrate its pneumatic pressures.
However, depending on the specific Vdiag (diagnostic version) and model of the car, it can also manifest as , pointing toward a faulty brake light switch or related wiring issues. Primary Definitions of DF037
The engine shuts off while driving or at low speeds.
To get the DF037 to 300,000 km (186,000 miles), ignore the "long-life" service intervals and stick to this schedule:
| Feature | DF037 Renault (1.9 dCi) | VW 1.9 TDI (PD) | BMW M47 (2.0d) | | --- | --- | --- | --- | | | 107 bhp | 105 bhp | 136 bhp | | Reliability | 7/10 (Injector seats) | 9/10 | 8/10 (Swirl flaps) | | Fuel Economy | Excellent (62 mpg) | Excellent (60 mpg) | Very Good (50 mpg) | | Cost to Fix | Low | Medium | High | | Smoothness | Average | Harsh | Silk |
: Use a Renault-specific diagnostic tool (like CAN Clip) to verify if the fault is "Active" or "Stored." A generic OBDII scanner may not provide the full sub-code details needed for a precise fix.
: Check the fuse box in the engine bay and under the dashboard for any blown fuses related to the ECU or immobilizer.
Specifically related to the switch circuit interpretation. Causes of the DF037 Renault Fault