Check the cable harness

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Solenoids S1, S2, SL And STH

Courtesy of VOLVO CARS OF NORTH AMERICA.

Use an ohmmeter to measure the resistance between the transmission connector and the end of the appropriate solenoid cable. Shake the harness gently during the measurement to identify any possible loose connections. The ohmmeter should read 0 Ω .

Terminal	Solenoid	Terminal	Solenoid
21	S1/white	24	STH/brown
22	S2/black	25	STH/, ground / blue
23	SL/red

Replace the cable harness if the ohmmeter reading shows another value.