P101F

Code

RENAULT P — Powertrain

- Stop engine warning lamp - circuit malfunction

Brand: RENAULT

Type: P — Powertrain

Views: UK: 3 EN: 12 RU: 10

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Page language: EN

Causes

Open or shorted wiring in the warning lamp circuit
Poor or corroded connector or ground
Faulty instrument cluster lamp or LED driver
Blown fuse or loss of supply to cluster/module
Control module (ECU/BCM) output transistor or software fault
Intermittent CAN or LIN communication problem affecting lamp control

Symptoms

‘Stop engine’ warning lamp illuminated or flashing intermittently
Lamp may stay off while fault stored (circuit monitoring detected)
Possible simultaneous messages or loss of other instrument cluster functions
No-crank or engine shutdown is possible in systems where the lamp interlocks other controls (vehicle-dependent)
Intermittent faults that change with vibration or temperature

What to check

Read fault memory with a compatible Renault diagnostic tool and record full freeze-frame and occurrence count
Check for additional related network or module communication DTCs
Visually inspect wiring, connectors and grounds for the instrument cluster and engine bay — look for corrosion, pin damage, chafing or recent repair work
Check fuse(s) protecting the instrument cluster and related modules
Operate the ignition and observe lamp behavior while measuring voltage at the lamp connector/cluster pin
Wiggle harnesses and connectors while monitoring for changes in live data or lamp status to find intermittent faults

Signal parameters

Lamp supply voltage: typically battery voltage (~12 V) with ignition on
Lamp control driver: may be a switched low-side (0 V active) or high-side PWM signal — expected idle voltage depends on driver type
Continuity/resistance: lamp filament/LED circuit should show low resistance when intact (value depends on lamp type)
Ground integrity: near 0 Ω between cluster ground pin and chassis ground
Diagnostic tool: lamp command status (on/off/flash) and module fault counters

Diagnostic algorithm

Collect vehicle information and confirm the fault code P101F and any other stored faults. Note when and how the issue presents.
Inspect fuses and relays related to the instrument cluster and ECU/BCM; replace any blown fuses and re-test.
Perform a visual inspection of cluster and engine-bay harnesses, connectors and grounds. Repair any damaged wiring or corroded terminals.
With ignition on, measure battery voltage at the lamp feed and measure the control pin at the cluster with a DVOM/oscilloscope. Verify expected supply and switching behavior.
Check continuity between the lamp connector and the instrument cluster pins; check ground continuity to chassis.
If wiring and power are good, use a diagnostic tool to command the lamp (if supported) and observe behavior. Attempt to activate/deactivate the lamp from the tool to confirm cluster/ECU control.
If the cluster does not respond correctly, consider removing the cluster and inspecting internal connectors or replacing the lamp/LED board. If replacement is needed, re-check after swap.
If lamp and cluster appear good, verify module power/ground and CAN/LIN communication to the controlling module (ECU/BCM). Repair or replace the module if communication/power faults persist.
Clear codes and perform road test or reproduction steps to confirm repair. Monitor for reappearance of P101F.
If intermittent and not reproducible, perform back-probing/longer-term monitoring and consider using a scope or data logger to capture the event.

Likely causes

Damaged or chafed harness near engine bay or firewall
Corroded cluster connector pins or poor ground at engine bay/body
Failed low-side/high-side transistor in instrument cluster driving the lamp
Blown cluster fuse or removed fuse link
ECU/BCM lost power or has internal fault affecting lamp command
Short to permanent 12V or ground on lamp feed causing overcurrent detection

Fault status

⚠️ Status

P101F — Stop engine warning lamp circuit malfunction detected. Fault stored by the control module; lamp may be illuminated, extinguished, or behave intermittently depending on the fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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P101F — - Stop engine warning lamp - circuit malfunction