There's no dip stick for the trans. If you can smell it it must be leaking out somewhere. Look at the lines coming from the trans to the radiator, for starters. Plenty of threads about transmission fluid here already.

Clear all the codes and see which ones come back.

Make sure you don't have water in the electronics under the carpets. Make sure the battery connections in the back and the ones in front at the jump point are clean and tight.

P0300-P0306 are missfire codes. No surprise there. Look at the plugs, coils, and coil grounds for starters.

P07xx codes are transmission control codes.

P0420 is a converter efficiency code. Worry about it later.

Some of the u-codes refer to problems communicating with the steering angle sensor. These issues can cause limited performance.

You can enter the other codes in Google and see what they're about.

That should keep you busy for a while.

 

Thanks John I already looked them up thats why I was looking for a place to s

 

Sounds like a blown ignition coil, they are known to fail on si6 so check those first. Had similar things happened to me before.

 

I'll check those, thank you

 

If I'm reading/researching correctly, I see:

• P0300–P0306: Random and individual cylinder misfires
• P0420: Catalyst efficiency below threshold
• P060C-68: Internal ECM fault
• P0700, P0742, P0744, P0896: Transmission control / torque-converter clutch faults
• U-codes (U0126, U0428, U0129, U0010): Lost comms between modules
• P0973, P0974, P0977: Transmission/brake switch circuit

All-cylinder misfires plus lost-communications and ECM faults often trace back to a shared electrical fault:

• Check engine-to-chassis ground strap & battery negative cable: Heat and vibration can loosen/corrode these. A bad ground can make coils misfire and modules drop off the network at speed.
• Intake-manifold harness: On late-model Volvos the coil-and-injector wiring under the plenum is notorious for chafing. Inspect for exposed wires or damaged connectors.

Another path to take is checking fuel/ignition things. If you can scan live data with an OBD reader and check fuel‐rail pressure, short/long-term fuel trims, MAF reading, and misfire counts per cylinder. Swap coil-packs around. If misfires follow a coil, you’ve found a bad coil or connector. If all cylinders are misfiring under load, suspect low rail pressure (weak pump or clogged filter). Hook up a gauge to the Schrader valve on the fuel rail and watch pressure at idle and WOT. Clearing the misfires will also stop raw fuel heating up your cat (P0420).



The FWD XC90’s 6-speed auto has no dipstick—it’s a hot-fill, side-fill design (https://www.swedespeed.com/threads/...-the-6spd-aisin-transmission-tf-80sc-in-3-2-and-v8-engines.627889/#post-7657891), warm the car to operating temp (~175–200 °F), park level, engine running in Park, remove the fill-level plug (under the bell housing on the passenger side). Fluid should drip out at the correct level. Burnt smell + P0742/P0744 (TCC solenoid faults) + P0896 (TCM internal) all point to either low/overheated fluid or a sticking torque-converter-clutch.


Erase all codes and road-test after each fix.

 

I manually inspected the coils and looked at tge wiring i could see do you know the location of the ground strap. I ran the codes got 330 of them each sensor said voltage high and voltage low right after that. i think it was every sensor in the car

 

The beauty of Volvo VIDA is that it reads the Volvo Diagnostic Trouble Codes and provides troubleshooting guidance specific to the Volvo model being read. You can get similar information about the DTC and diagnostic info by converting your basic OBDII codes here:

Volvo to OBD-II DTC Cross Reference

Volvo to OBD-II DTC Cross Reference

www.dtcdecode.com

 

thanks everybody looks like i will be busy for a few days