Technical Bulletin

Known Issues With Toyota Prius And Mercedes-Benz C-Class

Autodata looks into reported issues with Toyota Prius and Mercedes-Benz C-Class models.

Toyota Prius


We are having difficulty diagnosing some faults on a 2013 Toyota Prius. The hybrid drive system warning lamp and engine malfunction indicator lamp (MIL) are illuminated. Also the hybrid battery pack is overheating. We are not hybrid vehicle specialists and we are reluctant to get too involved in repairing this car. Do you know of any possible repairs we could carry out to fix this car?


Yes, we are aware of a fault which affects Toyota Prius models produced from 2013. While the fault can be corrected by a competent technician we strongly advise that all personnel working on hybrid vehicles are suitably trained to carry out the necessary operations. When working on high voltage circuits and components ensure all safety related guidelines are adhered to.

We also recommend that the high voltage battery pack is disconnected/ isolated. From the symptoms you have described the fault is likely to be due to foreign objects and/or debris in the hybrid battery pack cooling fan reducing or stopping the air flow. Remove and clean the hybrid battery pack cooling fan. Replace the hybrid battery pack cooling fan if necessary.


Mercedes-Benz C-Class Question

Whilst their vehicle was with us for a service the customer mentioned that the rear view mirror permanently vibrates whilst driving. The vehicle is a 2014

Mercedes-Benz C-Class. We have checked the rear view mirror for any broken retaining clips but didn’t find anything visibly wrong with it. Can you help?


Yes, we are aware of this fault on several Mercedes-Benz models and it is due to movement between the rear view mirror mounting and the windscreen upper cross member. Remove rear view mirror Fig. 2. Remove rear view mirror mounting. Fit vibration damper disc, available from Mercedes-Benz parts department, between the rear view mirror mounting and the windscreen upper crossmember. Refit rear view mirror. Carry out road test to ensure the fault has been rectified.

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