If you are seeing the error code 1525F3 (often displayed as DTC 1525F3 or P1525) on a Renault, Dacia, or Renault Samsung, here is the short answer:
This is not the real problem.
This specific code usually translates to: “Consistent Multiplex Signals for Cruise Control/Speed Limiter” (or “Cruise Control Function Variable”).
It means the car’s computer (ECU) has detected a fault elsewhere in the engine (like a sensor or injection issue) and has disabled the Cruise Control for safety. The 1525F3 code is just the Cruise Control system complaining that it has been turned off.
To fix this, you must ignore the 1525F3 code and look for the other error codes stored in the system.
How to troubleshoot this:
You likely have a “Check Injection System” or “Check Anti-Pollution” warning on your dashboard. You need to scan the car again and look for the Root Cause codes.
Here are the most common “real” faults that trigger the 1525F3 “ghost” code:
1. Turbo Pressure Issues (Most Common)
The Fault: A boost leak (split hose) or a faulty Turbo Pressure Sensor.
What to check: Listen for a “hissing” sound when accelerating. Check the small rubber hoses connected to the turbo sensor.
2. Exhaust Gas Temperature (EGT) Sensor
The Fault: The sensor that measures exhaust heat before the turbo often fails on 1.5 dCi engines.
What to look for: A code like P0544 or DF004. If this sensor sends bad data, the ECU disables cruise control immediately.
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3. DPF (Diesel Particulate Filter) Issues
The Fault: A blocked DPF or a broken Differential Pressure Sensor (the rubber pipes often melt or split).
What to look for: Codes related to “Soot accumulation” or “Pressure differential.”
4. Glow Plugs
The Fault: On Renault 1.5 dCi engines, even a single bad glow plug can sometimes trigger a “Check Injection” warning that disables cruise control.
What to look for: Code P0380.
5. Oxygen (Lambda) Sensor
The Fault: The upstream O2 sensor is reading values out of range.
Summary of Steps:
Do not replace your Cruise Control buttons or steering wheel switches—they are fine.
Scan the car again using a tool that can read Renault-specific codes (like CanClip or a good OBD2 scanner).
Find the other code. (e.g., P0380, P0544, P0235).
Fix that part. Once you fix the engine sensor or leak, the 1525F3 code will disappear automatically (or can be cleared).
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