P0966 Fault Code

Pressure Control Solenoid B Control Circuit Low

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0966 fault code indicates a problem with the Pressure Control Solenoid B control circuit, specifically that the circuit is operating at a lower voltage than expected. This solenoid is crucial for managing the hydraulic pressure in the transmission, which affects shifting quality and overall performance.

• This code typically triggers the Check Engine light.
• It may affect transmission performance, potentially leading to slipping or harsh shifting.

What are the symptoms of the P0966 code?

Drivers may experience various symptoms associated with the P0966 code, including:

• Erratic or harsh shifting of the transmission
• Slipping or delayed engagement of gears
• A decrease in fuel efficiency due to poor transmission performance
• Dashboard warning lights illuminated, specifically the Check Engine light.

What causes the P0966 code?

Several factors could contribute to the P0966 code:

• A faulty pressure control solenoid
• Damaged wiring or connectors in the solenoid circuit
• Low transmission fluid levels or dirty fluid
• Faults within the transmission control module (TCM)
• Electrical issues affecting solenoid operation, such as a short circuit or open circuit.

How to fix P0966?

Repairing the P0966 fault code usually involves:

• Inspecting the pressure control solenoid and its connections for damage or corrosion
• Testing the voltage and resistance of the solenoid circuit with a multimeter
• Replacing the pressure control solenoid if it's found to be faulty
• Checking for and addressing any low transmission fluid levels or contamination
• If necessary, reprogramming or replacing the transmission control module.