How to Pull Up Volvo Diagnostic Trouble Codes

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In this video, we're going to show you how to check for diagnostic trouble codes or DTCs in your Volvo's control modules. This will not give you exact code numbers but rather inform you of the status of each module. Here we are using a 2002 V70, but it's similar for almost all the Volvo models from model year 2001 through 2008.

With the key in position II, and with the engine running, you'll notice your READ button and your fog light button, hold down the READ button, press twice the fog light button, and see on the dash that the system's checking. You can see it’s got DTCs or diagnostic trouble codes, each time you press the button it cycles through the computers. It shows you if there’s DTCs set or if its ready.

In certain circumstances it needs more time to check and make sure you're checking. We’re going to walk you through each one of the modules and what it's saying.

First module is your BCM, or Brake Control Module, and that's the module that moderates the anti-lock braking. SRS is your Supplementary Restraint System, or your airbag system. It's good to not have any codes in here. If you did, you probably have an airbag light on, on your dash. TCM: this runs your Transmission Control Module. Here we have the Engine Control Module, and there is a diagnostic trouble code set here, it's important to note that if you have this, there's a good chance that you got a check engine light on, and your vehicle won't pass inspection. The AUM is the Audio Module, which is basically your radio and you can see here that it's ready and free of codes. Here is the CEM, or Central Electronic Module. You can see that there's a diagnostic trouble code set there. This module communicates with all the modules in the vehicle, so it's important to make sure that those codes are checked and if there is nothing that could hinder vehicle inspection when it comes due. Next is your DIM or your Driver Information Module. That's your instrument cluster in front of you. You can see that there is indeed a DTC set there. The DDM is the Driver's Door Module, the DTC set there. If your window goes up and then comes quickly back down, with the auto-up feature, chances are that's why you've got a DTC set there. CCM, or your Climate Control Module: that runs your climate control. If you've got irregular heat or air conditioning or it's not coming out of the correct vents, it's a good chance you're going to find a DTC or diagnostic trouble code there. The PDM is the Passenger Door Module and much like the driver's door module, if you're having issues with the windows going up and down irregularly with the auto-up and auto-down feature, there's a good chance you're going to get that DTC set there. It's also involved with central locking as well. This is your Rear Electronic Module, REM, and that runs the module from the back that communicates with the Central Electronic Module. The SWM is your Steering Wheel Module which takes care of the function of the steering wheel. Finally, your UEM which is the Upper Electronic Module, controls the dome lights and sun roof if it's equipped.

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