What Does P0964 Mean?
The TCM has detected an open circuit or general electrical fault in the Pressure Control Solenoid B (PCS-B) control circuit. PCS-B is responsible for regulating a secondary line pressure circuit or specific clutch apply pressure within the transmission. An open circuit means the solenoid cannot be energized, which typically forces the transmission to default pressures. The driver may experience harsh shifts, delayed engagement, or limp mode activation.
Safety Warning
The transmission may operate with incorrect pressures, causing harsh shifts or entering limp mode. Continued operation with improper pressure control can damage clutch packs and bands. Have the vehicle towed or drive minimally to a repair facility.
Common Causes
35%
Failed Pressure Control Solenoid B with an internally open coil winding
30%
Broken or disconnected wire in the PCS-B circuit within the internal transmission harness
20%
Corroded or damaged transmission case pass-through connector affecting PCS-B pins
10%
Open or damaged external wiring between TCM and transmission connector
5%
Faulty TCM PCS-B driver circuit
Diagnostic Steps
1
Check transmission fluid level and condition — low fluid can cause solenoid overheating and premature failure.
2
Disconnect the transmission case connector and measure PCS-B solenoid resistance — typical specification is 4-8 ohms. An open (OL) reading confirms a failed solenoid or internal harness break.
3
If the solenoid reads open, disconnect the internal harness at the solenoid and measure the solenoid alone. An open solenoid requires replacement of the solenoid or solenoid pack.
4
If the solenoid is within specification, check continuity of the internal harness from the solenoid connector back to the case connector pins.
5
Verify external harness continuity from the transmission case connector to the TCM connector. Check for damaged or corroded pins at both ends.
6
If all wiring and the solenoid are good, suspect a TCM driver fault — command PCS-B on with the scan tool and measure current at the TCM output.
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The TCM has detected an open circuit or general electrical fault in the Pressure Control Solenoid B (PCS-B) control circuit. PCS-B is responsible for regulating a secondary line pressure circuit or specific clutch apply pressure within the transmission. An open circuit means the solenoid cannot be e...
The most common cause of P0964 (Pressure Control Solenoid "B" Control Circuit/Open) is: Failed Pressure Control Solenoid B with an internally open coil winding
Typical repair costs for P0964 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The transmission may operate with incorrect pressures, causing harsh shifts or entering limp mode. Continued operation with improper pressure control can damage clutch packs and bands. Have the vehicle towed or drive minimally to a repair facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0964 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission / Transaxle
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
