P0799 Pressure Control Solenoid C Intermittent

Pressure control solenoids are current-controlled proportional valves, and what B and C mean depends on the design: on GM's clutch-to-clutch automatics they are the pressure valves of clutches 2 and 3, on GM's CVT B is primary pulley pressure and C line pressure, on Jatco CVTs B is the secondary pressure valve, on Saab's AF40 B and C are clutch valves SLC1/SLC2. P0799 is an intermittent electrical fault of valve C. No manufacturer document available to us uses it; Saab's AF40 catches short dropouts within its circuit codes (five times in 100 ms). A loose contact or chafed harness is the likely cause; harsh shifts or limp mode appear at times.

Likely causes

Symptoms

• Limp mode or harsh shifts at times
• Warning lamp comes and goes

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, saabwisonline.com.