P0964Pressure Control Solenoid B Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- MIL and transmission warning on
- Certain gears missing or limp mode
- Dual-clutch gearbox drives on one sub-gearbox only
- Likely causes
- LikelyOpen solenoid coil
- PossiblePoor contact at the transmission connector or internal harness
- PossibleBroken control wire
- RareFaulty output stage in the control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.