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walterhofmann9

V40 Auxiliary Heater Issue

I'm pulling my hair out! My 2018 Volvo V40 with a gasoline engine auxiliary heater refuses to turn on. The code reader shows an error stored in memory related to the heater at 145970 km. Any ideas before I start tearing things apart? I'm worried it might be a coolant leak or something more sinister with the climate control system.

Summary of the thread

A 2018 Volvo V40's auxiliary heater is not functioning, with an error code indicating a potential issue at 145970 km. Possible causes include a defective glow plug or issues with the climate control system. It is advised to have a qualified workshop diagnose and repair the problem to prevent further damage, as attempting self-repair without specialized tools could complicate the issue.

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4 comment(s)

pialang47

Based on the symptoms and error code, a defective glow plug within the auxiliary heater unit is a likely culprit. Have you noticed any unusual smells or sounds coming from the ventilation system when attempting to use the heater? It would also be useful to check the temperature sensor readings to see if they are within the expected range.

walterhofmann9 (community.author)

Thanks for the quick reply! No unusual smells or sounds, thankfully. Where exactly is the temperature sensor located? Is it something I can easily check myself, or am I better off just taking it to a workshop?

pialang47

Given the complexity of the auxiliary heater system and the potential for further complications, I would advise against attempting a repair yourself, especially without specialized tools and diagnostic equipment. Continuing to run the heater with a defective glow plug can cause additional damage. I recommend taking your Volvo to a qualified workshop for diagnosis and repair.

walterhofmann9 (community.author)

Okay, appreciate the advice. I was hoping to avoid the workshop, but it sounds like the best course of action. Just got a quote for 440€, glow plug replacement. Thanks again for pointing me in the right direction!

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VOLVO

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V40