hannes_blitz58
Mobilio Rough Cold Starts
Summary of the thread
A 2023 Honda Mobilio diesel is experiencing rough cold starts and increased fuel consumption, with an error code indicating a potential issue with the auxiliary heater. The rough running includes poor idling and sluggish acceleration until the engine warms up. The problem is likely linked to a malfunctioning PTC heater, which is crucial for quickly increasing coolant temperature during cold starts. It is advised to consult a workshop to confirm the issue and proceed with repairs.
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4 comment(s)
hannes_blitz58 (community.author)
By rough, I mean it idles poorly, hesitates when accelerating, and generally feels sluggish until it warms up. The error code is something along the lines of 'PTC heater malfunction.' I don't have VCDS, just a generic OBD2 scanner. The scanner does not show the temperature readouts.
danielwalter82
Understood. The symptoms you're describing are consistent with a defective electric auxiliary heater. The engine control unit relies on the PTC heater during cold starts to quickly increase the coolant temperature and reduce emissions. If the heater is faulty, the engine will run inefficiently, and fuel consumption will increase. Given your limited access to diagnostics, I would advise consulting a workshop to confirm the malfunction.
hannes_blitz58 (community.author)
That's what I was afraid of. I'll book it into the shop this week then. I had a sneaking suspicion it was the auxiliary heater, and your comments cement that belief. I will report on the outcome! They've quoted 350€ to get it fixed.
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HONDA
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MOBILIO
danielwalter82
I am familiar with this issue. I have a Mobilio as well. When you say rough running, can you better describe what that means, and what the exact error code is? Do you have access to VCDS to check the measured values of the temperature sensors?