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Engine Speed Sensor Signal Fault Complete Guide

What is Renault DF120 Fault Code?

Renault DF120 fault code generally indicates:

DF120 – Engine Speed Sensor Signal Fault , Mostly on this error code ECU ECM faulty.

DF120 – Crankshaft Position Sensor (TDC Sensor) Signal Missing / No Signal

The Engine Control Module (ECM) is not receiving a proper RPM signal from the crankshaft position sensor. Without this signal, the ECM cannot accurately determine engine speed and crankshaft position.

Affected Renault Vehicles

DF120 can appear in many Renault vehicles including:

Renault Duster
Renault Lodgy
Renault Kwid
Renault Triber
Renault Kiger
Renault Clio
Renault Megane
Renault Scenic
Renault Kangoo
Renault Logan
Renault Fluence
Renault Master

Depending on the engine type, the exact fault description may vary slightly.

Dashboard Warning Lights

When DF120 is active, the following warning lamps may appear:

Check Engine Light (MIL)
Service Light
Electronic Fault Warning Light
Injection Fault Warning
Stop Light (in some severe cases)

Common Symptoms of DF120

Engine Cranks But Does Not Start

This is one of the most common symptoms.

The ECM cannot determine engine position without the crankshaft signal.

Hard Starting Problem

Vehicle may take longer to start.

Sudden Engine Stalling

The engine may shut off while driving.

Pickup Problem

Vehicle acceleration becomes weak.

Power Loss During Driving

The engine may suddenly lose power while running.

RPM Meter Not Working

In some cases, the tachometer needle may not move during cranking.

Engine Misfire

Irregular combustion may occur.

Jerking While Driving

Vehicle may hesitate or jerk under acceleration.

Intermittent Starting Problem

Sometimes the vehicle starts normally and sometimes it does not.

Main Causes of DF120 Fault

Faulty Crankshaft Position Sensor

The most common cause.

Damaged Engine Speed Sensor Wiring

Broken or shorted wires.

Loose Sensor Connector

Poor connection creates signal interruption.

Corrosion Inside Connector

Moisture damage can affect signal quality.

Metal Particles on Sensor Tip

Metal filings can interfere with signal generation.

Damaged Flywheel Teeth

Missing or damaged trigger wheel teeth can cause incorrect RPM readings.

Low Battery Voltage

Weak voltage may affect sensor operation.

ECM Internal Fault

Rare, but possible.

What Happens When Engine Speed Signal Is Lost?

The Engine Speed Sensor provides RPM information to the ECM.

The ECM uses this signal for:

Fuel Injection Timing
Injector Operation
Engine RPM Calculation
Ignition Timing
Engine Synchronization

If the signal disappears:

Injectors may stop operating
Engine may not start
RPM reading may disappear
Engine may stall unexpectedly

How to Diagnose DF120

Step 1

Connect Renault CLIP, Launch, Xtool, Autel, or another professional scanner.

Step 2

Read fault memory.

Confirm DF120 status:

Present
Stored
Intermittent

Step 3

Monitor Live Data.

Check:

Engine RPM During Cranking

If RPM remains 0 during cranking, suspect the crankshaft sensor circuit.

Step 4

Inspect Sensor Connector

Check for:

Loose terminals
Corrosion
Damaged pins

Step 5

Inspect Wiring Harness

Look for:

Open circuits
Short circuits
Wire damage

Step 6

Inspect Flywheel Signal Ring

Check for damaged teeth or contamination.

Repair Solutions

Depending on diagnosis:

Replace Crankshaft Position Sensor
Repair Sensor Wiring
Clean Connector Terminals
Repair Ground Connections
Repair Flywheel Signal Ring
Update ECM Software if applicable
Repair ECM if confirmed faulty

Can DF120 Cause No Start Condition?

Yes.

DF120 is one of the most common causes of:

Crank No Start
Hard Starting
Sudden Engine Stall
RPM Signal Loss

Can DF120 Cause Pickup Problems?

Yes.

When the RPM signal becomes unstable:

Vehicle loses power
Pickup becomes weak
Engine hesitates
Acceleration becomes irregular

Conclusion

Renault DF120 is primarily an Engine Speed Sensor Signal fault related to the Crankshaft Position Sensor (TDC Sensor) circuit. Common symptoms include Check Engine Light, no-start condition, stalling, poor pickup, RPM signal loss, engine hesitation, and intermittent starting problems. Proper diagnosis should focus on the crankshaft sensor, wiring, connector condition, flywheel signal ring, and ECM communication before replacing components.

Recents in Beach

df120 renault