P0964 code meaning
Pressure Control Solenoid B Control Circuit/Open
Powertrain system Generic code P09xx codes Check engine light
What P0964 means
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.
P0964 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0964
- MIL and transmission warning on
- Certain gears missing or limp mode
- Dual-clutch gearbox drives on one sub-gearbox only
Common causes of P0964
- Most likelyOpen solenoid coil
- PossiblePoor contact at the transmission connector or internal harness
- PossibleBroken control wire
- Less likelyFaulty output stage in the control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid bWiring harnessTCM
What each part of P0964 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 9 | Area: transmission. |
| 64 | The exact fault in that area. |
What to do next
- Note P0964 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0964
What does P0964 mean?
P0964 means "Pressure Control Solenoid B Control Circuit/Open". Open circuit in the driver of pressure control solenoid B. It is a generic code, so it means the same on every make.
Is it safe to drive with P0964?
Drive gently and only to a workshop. With P0964 the car can go into limp mode (reduced power) to protect itself.
Will P0964 fail an emissions test?
Yes, it can. P0964 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0964 to fix?
Difficulty: hard. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0964 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.