Air conditioning problems in my 2015 Isuzu D-Max
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Asked by Keith
Can the SVS light indicate a problem with the air-conditioning unit in my 2015 Isuzu D-Max? The light has been coming on every time I start the vehicle. Today I noticed the air-con blowing hot air. I needed to put vehicle into 4WD and when I went back to 2WD, the light went off but the air-con was still blowing hot. If the air con has stopped working as it should, would this cause the SVS light to come on? I did have the diagnostic codes checked and PO661 showed up.
Answered by CarsGuide
29 Jan 2025Let’s start at the start. The SVS light on your car stands for 'Service Vehicle Soon'. Fundamentally, it’s telling you that something is not right somewhere on the vehicle and the computer has logged the fault. That’s why a scan showed up the code PO661.
On this vehicle, code PO661 relates to the electronics that control the swirl valve inside the intake manifold. This valve works to create the maximum gas velocity inside the intake runners and, therefore, gain the cleanest, most complete burn of the fuel and air entering the engine. If this valve is not operating properly, you may find a loss of power as the turbocharger won’t be working at its most efficient. In some cases, the same fault code can show up because of a problem with the engine’s EGR valve which is also part of the engine’s intake system. This may require the manifold to be removed and manually cleaned.
However, it’s unlikely to be anything to do with the car’s air-conditioning system, which is more likely to be a coincidence. That said, if the engine is running hotter than normal because the intake system is not working properly, then the car may have an interlock that prevents the air-con coming on to help keep coolant temperatures at bay.
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