P0964
Pressure Control Solenoid "B" Control Circuit/Open
- Severity
- High
- Driving
- Drive only to a garage
An open circuit or general fault in the control circuit for pressure control solenoid "B". This is the same physical solenoid as P0775, seen from the module's driver side rather than from the solenoid's behaviour - so if both codes are stored, they are one fault and should be diagnosed together. Without control of this solenoid the module cannot set line pressure and will default to a failsafe.
Possible causes
- CommonOpen solenoid winding
- CommonCorroded transmission case connector, or fluid wicking into it
- CommonInternal transmission harness failure
- PossibleBroken wire between the module and the transmission
- RareFailed control module driver
What you might notice
- Transmission stuck in one gear
- Very harsh shifts
- Harsh engagement into drive or reverse
- Several solenoid codes stored together
- Check engine light on
What to check, in order
- Read all transmission codes first. Several solenoid control circuit codes at once point at the case connector or the internal harness, not at several failed solenoids - that observation saves a great deal of unnecessary work.
- Pull the transmission case connector and look for fluid inside it. Fluid wicking up the harness corrodes the pins and can reach and destroy the control module itself.
- Measure the solenoid winding resistance at the case connector against specification.
- Check the harness between the module and the transmission for chafe damage.
- Check the fluid level and condition while the vehicle is raised.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Transmission and control modules
P0900P0901P0902P0903P0904P0905P0906P0907P0908P0909P0910P0911P0912P0913P0914P0915P0916P0917P0918P0919P0920P0921P0922P0923P0924P0925P0926P0927P0928P0929P0930P0931P0932P0933P0934P0935P0936P0937P0938P0939P0940P0941P0942P0943P0944P0945P0946P0947P0948P0949P0950P0951P0952P0953P0954P0955P0956P0957P0958P0959P0960P0961P0962P0963P0964P0965P0966P0967P0968P0969P0970P0971P0972P0973P0974P0975P0976P0977P0978P0979P0980P0981P0982P0983P0984P0985P0986P0987P0988P0989P0990P0991P0992P0993P0994P0995P0996P0997P0998P0999