Powertrain, generic · Transmission

P08BC Pressure Control Solenoid L Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Set when pressure control solenoid L keeps applying pressure although the control module has commanded it off, so the element it feeds stays loaded. No manufacturer publishes this code. Toyota, the only documented user of letter L, files a stuck valve under P08BA71 instead. GM's P08C5 for solenoid M of the Corvette dual clutch shows how such a check can work: after a selector valve change the module watches the shift rods, and unexpected movement of one rod or relaxation of another within 200 ms points to a valve that keeps pressure on. CARB lists transmission solenoids as monitored output components. P08BB is the stuck off counterpart. For the driver this means shift shock, binding or a fallback gear.

Likely causes

Valve spool held open by debris
Worn bore in the valve body letting pressure through
Output stage or wiring keeping the solenoid energised

Symptoms

  • Check engine light on
  • Harsh engagement or binding during shifts
  • Transmission locked in a fallback gear

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–4,000
Time1–6 h

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

Parts involved

pressure control solenoid lvalve body

Related codes

P08BAP08BBP08C5P27BAP0869

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov.