FCPGroton wrote:You could have a stuck starter solenoid. Have someone in the driver seat with the car in the start position and tamp the starter solenoid. If the car starts to crank, then there is your problem.
I have to add that I had this same problem and found the same solution.
Problem: No crank, no click.
Symptoms: All lights came on, did not dim when turning ignition key. Can hear fuel pump start and stop.
Since in the past I've had to back the key just a bit to shift to drive, get lights and other accessories while running, I assumed the ignition switch had finally died. Replaced for about $60 and easy repair. Still nothing. Used the service start connection, still no crank. Considered PNP switch -- still had reverse lights. Ratcheted shifter back and forth 20+ times, still no crank. Cleaned battery leads and tightened. No crank.
After reading this suggestion, I tapped lightly on starter solenoid with hammer two or three times. Cranked right up. (No need to find a helper to turn key.)
After checking the battery and the battery leads, this would be my second diagnostic step going forward, and I'd suggest to anyone with the no crank problem.
Easiest solution (Occam's Razor) would therefore be: 1) Bad battery or battery connection (at the battery or at the starter) 2) Stuck solenoid. After that, it gets more complicated, in order of expense and repair complexity: 3) ignition switch; 4) PNP switch; 5) Starter.
When the problem happens suddenly and unexpectedly with no real preliminary symptoms, it's probably #1 or #2.
As others have mentioned, the more complicated Volvo 850 repairs such as ignition, PNP and starter are very nicely covered by Robert DIY at YouTube: https://www.youtube.com/user/RSpi007
If you don't know where the starter solenoid is, watch Robert's starter repair video at about 50 seconds from the beginning: https://www.youtube.com/watch?v=um5uoW0XSL8
. It has a black cover that snaps off and on very easily.
Unlike many other cars, the starter and solenoid in the 850 are accessible from the top.