With the Key in the ignition turned on, here are some voltage readings I get. Vehicle Speed Sensor (one test lead on each prong of supply plug): 7.69 volts. Engine Speed Sensor (ibid) : 7.66 volts. Thought maybe this might help someone decipher this problem.

I just read that the VSS requires 12 volts on the supply side. Can anyone confirm? (I've got voltage that fluctuates between 6.6 and 7.4)

Thanks

Thank you for the input.

I went back to the dealer, and, thankfully, they turned off the SRS with no charge.

And thank you for the condolences....I'm about to lose my mind trying to solve this!

Got it. Will take care of it. Thank you.

So I just read a post where a mechanic had a similar issue. CEL + Flashing Arrow on a car that had been sitting a while. He removed the ECM and cleaned it, and, voila, both were gone. Since I haven't had much luck yet, I thought I'd try it. Nada. It didn't work for me. In fact, behind the black plas...

Update: Following these instructions ( https://www.matthewsvolvosite.com/forums/viewtopic.php?f=1&t=29930 ), I disassembled, cleaned, and reassembled that PNP switch. Afterwards, I went to AutoZone and now only have three codes, viz., P1057 P0717 (Input turbine speed sensor.) P1057 I read somewh...

Update: I have flushed the transmission fluid per the instructions here: https://www.matthewsvolvosite.com/forums/viewtopic.php?f=1&t=8767 I have changed the oil and filter. Now, lucky me , I have four codes. P1057 P0717 P0715 P1057 I have not yet changed the other parts I listed in my previous ...

Update: (Any ideas, suggestions, etc., would be GREATLY, ABUNDANTLY, EMINENTLY, and INFINITELY, appreciated.) I have changed the VSS, and the Engine Speed Sensor. (Volvo dealer said to.) I checked supply voltage at the VSS and have 7.4+/-. I checked supply voltage at both Wheel Speed Sensors and had...

*Turbine input/output speed sensor respectively...

Ok. So I cleaned every sensor power clip I could find with electronics cleaner from Autozone. After re-assembly, the CEL was still on. (As was the SRS, Flashing arrow, and SEL, of course.). I thought, 'what the heck, I'll re-install the original speed sensor and go check the OBDII codes. It gave fiv...