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Help needed with code indentification

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
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Help needed with code indentification

Post by Georgeandkira » Sat Aug 17, 2019 2:10 pm

Hello, We're on our 3rd V70 but today I looked at a 2004 XC-90 for sale at a local gas station.
It has the same 5 cylinder engine I'm driving now.
It drove quite well though it had no discernible turbo boost.
It shifted well, had clean oil on the dipstick though a few chunks of build-up on the filler cap and oil fill grille.
The AC worked just fine too.
I pulled 17 codes with my BSR-PPC reader.
There was no Check Engine Light
The CEL did light up appropriately with the start-up circuit.

I posted this in the V70 forum as well to broaden my net.

I used CAPS after each code and definition for clarity.

1) ECM 2A2A - Rear HO2S bank #1 heating. I WILL CHANGE THE REAR O2 SENSOR
2) CEM 1A66 - Communication with ICM. NO IDEA WHAT ICM MEANS
3) CEM 5B01 - LH heating element. HEATING ELEMENT OF WHAT?
4) CEM 6C48 - Transponder type. WHICH TRANSPONDER?
5) CEM 6C49 - Steering Column Lock Module. KEY WORKED OK. THE DISABLER RING (see above)
6) CEM 8F2D - Windshield Wipers / wiper. WIPERS AND WASHERS WORKED OK
7) CEM 8F2E - Windshield Wipers / wiper. as above
8) ECM 4801 - TWC efficiency bank 1. WHAT IS TWC?
10) PDM 0025 - as above
11) UEM 0035 - reading lamp
12) UEM 0037 - reading lamp
13) UEM 0039 - General Courtesy lighting
14) UEM 0080 - Rain Sensor
16) PCM 002B - as above
17) PCM 0023 - as above

Any help with any of these will be much appreciated.
1) I'm sure the heating element of the sensor went bad so it's self explanitory
2) as stated, what's an ICM and where should I look?
3) LH (left hand?) heating element?
4 + 5) The anti-theft transponder pick-up ring?
6 + 7) Any clue here as the wipers and washers work.
8) TWC efficiency? no clue
9 + 10) Another odd Volvo window positioning code?
11 - 14) I can live with these. I'll check the bulbs and throw water on the windshield
15 - 17) There were no PCM definition nor heading let alone codes listed.

Any help at all with these puzzlers. thanks George (and Kira)
I have no idea how the "8"'s became Sunshine emojis.

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Re: Help needed with code indentification

Post by jimmy57 » Sat Aug 17, 2019 2:23 pm

Most of those are what tech call ghosts codes. If battery was weak or key left on many of this will occur. The ICM goes down when battery get low and CEM notices the "dropped call". The lamp ones may be due to installation of LED bulbs as my cars with LEDs installed in interior or exterior positions have those. The O2 heating code must be intermittent as that one would turn on check engine light if it was continuous or had happened recently. It may have had the sensor unplugged with key on. Burnt out elements do not heal themselves but faulty connections can be intermittent. The PDM and DDM codes occur from holding switches too long once window is up or down all the way. Fidgeters and kids set those. If A Volvo or many other high network content cars come to me for pre-purchase exams I am suspicious when there are no codes. It could mean someone cleared to codes recently to cover an issue. Ghost codes present means honesty.

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