Peugeot 2008 Sos Battery — Replacement |verified|
Replacing the SOS (emergency call) battery in a Peugeot 2008 is a specialized task because the battery is not part of the main engine battery system. It powers the autonomous telematics unit, which ensures the SOS system works even if the car's main power fails. Key Details for SOS Battery Replacement Symptoms of Failure : The most common sign is a flashing red light
on the SOS button or a "Backup Battery Fault" message on the dashboard. : The battery is housed within the autonomous telematics box . Depending on your specific model year: It is often located under the dashboard near the steering column In some versions, it may be found within the overhead console near the interior lights. Battery Type
: This is a specific rechargeable backup battery (often a Ni-MH or Li-ion pack) rather than a standard button cell or car battery. You should use the exact part number specified in your Peugeot Service Box handbook based on your VIN. Replacement Procedure Safety First : Disconnect the vehicle's main 12V battery before starting to avoid electrical shorts.
: Remove the relevant trim panels (either the lower dash or the overhead console) carefully to avoid breaking plastic clips.
: Unplug the old battery pack from the telematics module and connect the new one.
: Some models may require a diagnostic tool to clear the fault code and "tell" the car a new battery has been installed. Service Box Service Information Estimated Lifespan Approximately 8 years (with authorized loss of 75%). Difficulty Moderate (may require removing dashboard trim). Recommendation If the light is red, the battery is likely flat or faulty.
To replace the SOS backup battery in a Peugeot 2008, you typically need to access the Autonomous Telematics Box (ATB), which powers the emergency call system. Quick Summary of Location & Tools
Location: Most commonly located behind the overhead console (near the SOS button itself) or within the telematics unit under the dashboard, often near the steering column. peugeot 2008 sos battery replacement
Tools Needed: A small flathead screwdriver (to pry plastic covers) and a replacement battery of the specific type recommended by Peugeot (check your manual for exact specs). Replacement Procedure
Preparation: Turn off the ignition and disconnect the vehicle's main 12V battery in the engine bay to avoid electrical surges or accidental SOS triggers. Access the Unit:
If in the overhead console: Use a plastic prying tool or screwdriver to gently unclip the cover panel where the SOS button is located.
If in the dashboard: Access may require removing trim panels near the steering column to find the telematics module.
Remove Old Battery: Unclip the battery cover from the telematics box and remove the old cell from its housing.
Install New Battery: Insert the new battery, ensuring the polarity (+/-) matches the markings on the unit.
Reassemble & Test: Clip the covers back into place, reconnect the main vehicle battery, and wait a few minutes for the system to re-initialize. Symptoms of a Failing SOS Battery The SOS button light flashes red or remains orange. Replacing the SOS (emergency call) battery in a
An "Emergency call system failure" or "SOS fault" message appears on the dashboard. The system is unresponsive when the button is pressed.
Note: In many cases, if the light is flashing red and the battery replacement does not clear it, the system may require a software reset or diagnostic clear at a Peugeot dealership using their official tools.
Final Recommendation
Do it yourself only if: You’re comfortable with interior trim removal, basic soldering, and have a way to clear fault codes (or don’t mind the warning light lingering for a few days).
Go to a dealer or indie shop if: Your car is under warranty, you hate trim work, or the warning stresses you out – just be prepared for a $300+ bill.
Skip the replacement entirely if: You don’t care about the SOS light (it doesn’t affect driving) and your region doesn’t mandate a functional eCall system.
Steps:
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Remove the overhead console
- Gently pry off the plastic cover around the SOS and Peugeot Connect buttons.
- Unscrew any visible T20 screws.
- Unclip the whole unit by inserting trim tools between the headliner and console.
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Disconnect the module
- Unplug the wiring harness (press the locking tab).
- Take the unit to a clean workbench.
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Open the SOS module
- Remove small screws on the back.
- Carefully separate the plastic halves – there’s a small circuit board inside.
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Locate the backup battery
- It’s a coin cell, usually soldered to the board with two metal tabs (vertical or horizontal mount).
- Note polarity (+ and –) and orientation.
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Remove the old battery
- Desolder the two tabs (or cut them if you’re careful, but desoldering is cleaner).
- Lift the old battery away.
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Solder in the new battery
- If you bought a battery with pre-soldered tabs, match the shape and polarity.
- Solder the tabs to the same pads on the PCB.
- Do not use a standard non-rechargeable CR2032 – it will leak or fail.
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Reassemble and test
- Reconnect the module (before fully installing overhead console) and reconnect car battery.
- Turn ignition on: the SOS button should not flash a fault code (e.g., fast blinking green/red).
- Press the SOS button briefly – it should say “System OK” or similar (cancel before connecting to emergency services).
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Refit overhead console in reverse order.
1. Why Replace It?
- Warning Light: A message like "SOS system faulty" appears on the dashboard.
- Dead Battery: The internal rechargeable battery (often Ni-MH or Li-ion) inside the telematic module (Connected Box) fails after 3-6 years.
- System Failure: The emergency call button may not work, and the system will fail its self-check.
Step 5: Install the New SOS Battery
- If soldering: Solder the new battery wires to the same points (red to positive, black to negative). Use heat shrink tubing to insulate.
- If plug-in: Connect the new battery.
- Secure the new battery with double-sided foam tape to prevent rattling.
Q: My Peugeot 2008 is from 2022. Does it have a replaceable battery?
A: Yes, but it may be a rechargeable battery integrated into the TCU. Some newer models require dealer reprogramming after replacement. Consult a specialist. Remove the overhead console
Procedure
Do You Need to Replace the SOS Battery?
Yes, absolutely. While not an MOT failure in most regions (check local laws), a functioning SOS system is a safety feature. In a serious accident where you cannot call for help, the eCall system could save your life. Replacing the SOS battery is a cheap, DIY-friendly fix compared to replacing the entire TCU (Telematics Control Unit), which can cost €500–€1000.