[skeeter123]

ABS light (and only ABS) on my 2000 Alero recently came on. At first it was intermittent, I checked wires going back ~2 feet from each wheel bearing, they all looked OK; checked/reseated sensor connectors on all hubs. All hub sensors had ~1100-1200 ohm resistance. Front hubs were replaced ~4 months ago. I thought it might be water-related since it seemed to happen after it rained, but now its on constantly. I got an ABS-capable scanner a week ago, got three codes:

C1232 Left front wheel sensor open or short
C1265 Left rear inlet valve solenoid malfunction
C1286 Steering sensor bias malfunction

I cleared all the codes a week ago, only the C1265 comes back. Others never re-appeared though car has been driven daily. Using the scanner, the C1265 code can be cleared, but it comes back immediately. By this I mean that with the key-on, engine-off (and ABS light on), when I clear the code there is an audible click from the ABS module under the battery, the ABS light goes out and immediately comes back on. Same exact thing happens when I do it with key-on, engine-on; and the engine rpm also hiccups a little. I opened the drivers-side wheel-well, took off and re-seated the big connector on the EBCM module, no effect.

Code says left-rear inlet valve, I'd think there'd be four separate valves/solenoids (one for each wheel) but I only see two connectors on the ABS solenoid module (under battery).
Haynes manual doesn't say much about ABS system.

Is there a way to test ABS module to confirm if its good/bad? Any body have any ideas?