Renault/Dacia/Samsung Renault Error 1525F3 | How To Fix

The error code 1525F3 on Renault, Dacia, and Renault Samsung vehicles is a common fault related to the Diesel Particulate Filter (DPF) system. 

Here’s a comprehensive breakdown of what it means, its symptoms, possible causes, and resolution steps:

What is Error Code DTC 1525F3?

This diagnostic trouble code is Renault-specific and often appears in vehicles like Dacia, Renault, and Renault Samsung models. It indicates a discrepancy in multiplexed information, particularly involving the cruise control or speed limiter system. Essentially, the signals from various vehicle modules (like engine, dashboard, or ABS) don’t match as expected, triggering this fault.

Common Symptoms and Scenarios

Typical signs of this error include:

• Engine warning light activation.

• Sudden loss of power or triggering of limp (degraded) mode.

• Cruise control or speed limiter becoming unresponsive.

• In some community-reported cases, complete cluster failure or CAN network dropout—e.g., a Megane 3 lost its cluster after grounding and battery cable cleaning, and DTC 1525F3 corresponded with a lack of cluster communication.

Possible Causes of DTC 1525F3

Based on various repair guides and forum insights, likely culprits include:

• Cruise control or speed limiter unit faults

• Faulty torque (torque) sensor—this sensor monitors throttle force and informs the ECU. Inconsistencies can trigger errors.

• Damaged wiring or poor connections among diagnostic modules via the CAN network.

• Turbo, boost system, or overboost issues – forum reports suggest checking turbo hoses and intercooler piping in cases of multiplexed info errors.

• Malfunctioning clutches or pedals: For instance, on a Megane 3, the clutch switch was unresponsive, and replacing the upper clutch pedal sensor resolved the issue.

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What Have Users Experienced?

On Reddit in /r/autorepair, one user list shows:

1525F3: “Consistent multiplex signals for CC/SL. The data supplied to the cruise control or speed limiter are not correct.”

On a forum (Megane 3):

• The fault surfaced after switching cruise control settings.

• Diagnostics showed no response from the clutch switch; shunting it had no effect.

• Ultimately, replacing the upper clutch pedal sensor fixed the issue.

On another forum (2009 Megane 3 DCI):

• A turbo or boost problem was suspected; advice centered on checking hoses connected to the intercooler.

Diagnostic & Fix Suggestions

Here’s a step-by-step approach to troubleshoot and resolve this error:

1. Read & clear the fault with an OBD-II tool, then repeat if it reappears.

2. Inspect the cruise control / speed limiter switch, especially if the fault correlates with its operation.

3. Test the clutch or brake pedal sensors:

   • Use live data to see if signals update when pressing these.

   • Replace any sensor that doesn’t respond.

4. Check turbo and boost system hoses, particularly for leaks or loose clamps.

5. Examine wiring and CAN connections for loose pins, corrosion, or physical damage.

6. After making repairs:

   • Erase the code, then perform a road test to confirm resolution.

   • If unresolved, professional diagnostics by a Renault/Dacia service center may be necessary.

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