Powertrain, generic (extended)

P27BD Pressure Control Solenoid N Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27BD stands for an open control circuit of solenoid N. GM's 2023 Corvette dual-clutch table 23OBDG07 names the part synchronizer actuation valve 2 and tests it while its low-side output is switched off: the driver chip tries to hold the pin at a small voltage with a tiny current, which only works without a load connected. A pin voltage between about 1.7 and 3.0 V after more than 5 ms off, confirmed for 150 ms, sets the code as Type A; the check runs continuously with battery voltage between 8.75 and 18 V and is suspended by supply voltage codes P0882/P0883. Ford's 2024 list uses P27BD for open load of SPV2 on the TR9070. Broken wiring, a loose connector or an open coil are typical.

Likely causes

Open solenoid N coil
Connector unplugged or pushed-out terminal
Broken control wire between TCM and solenoid

Symptoms

  • MIL on in the same trip
  • Gears on the affected shift rod blocked
  • Transmission substitute mode

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–900
Time1–4 h

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

Parts involved

pressure control solenoid nwiring harness

Related codes

P27BBP27BEP27BFP27C0P08C8P27C5

References: law.cornell.edu, gsi.ext.gm.com, fordservicecontent.com.