Powertrain, generic · Transmission

P0964 Pressure Control Solenoid B Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Open circuit in the driver of pressure control solenoid B. What B controls differs by gearbox: GM's 8-speed uses it for clutch 2 (CB12345R), the 9-speed for CB29 and the 10-speed for CB128910R, Allison 1000 for pressure control solenoid 2, and GM's dual-clutch gearbox for the even-clutch pressure valve. GM sets it at more than 200 kOhm for 0.3 s (Type A, one trip), Allison at 173 kOhm or more after an intrusive test, the dual-clutch unit after 150 ms. GM six-speeds do not use P0964; an open in their 3-5-reverse solenoid shows up as P0967. Ford's OBD summaries list no B or C codes. Depending on the clutch involved, gears are lost or the unit drops into a fixed limp gear. Siblings: P0965, P0966, P0967.

Likely causes

Open solenoid coil
Poor contact at the transmission connector or internal harness
Broken control wire
Faulty output stage in the control module

Symptoms

  • MIL and transmission warning on
  • Certain gears missing or limp mode
  • Dual-clutch gearbox drives on one sub-gearbox only

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–1,800
Time1–5 h

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

Parts involved

pressure control solenoid bwiring harnesstcm

Related codes

P0965P0966P0967P0960P0968P0775

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.