P0776: Pressure Control Solenoid B Stuck Off
The P0776 code indicates that the Transmission Control Module (TCM) has detected a malfunction in the pressure control solenoid B circuit. This solenoid regulates hydraulic pressure to the transmission clutches and bands. When it is stuck off, the transmission may experience harsh shifts, slipping, or fail to engage gears. The issue can be caused by electrical faults, low fluid, or internal transmission damage.
01. Most Common Causes
- Faulty pressure control solenoid B
- Low or dirty transmission fluid
- Wiring or connector issues in the solenoid circuit
- Internal transmission mechanical failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed gear shifts
- Transmission slipping or overheating
- Vehicle stuck in limp mode or fails to shift
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Check transmission fluid level and condition; top off or replace if necessary.
Step 3: Inspect wiring and connectors for damage, corrosion, or loose connections.
Step 4: Test solenoid resistance and power/ground circuits with a multimeter.
Step 5: Perform a transmission pressure test to confirm solenoid operation.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with P0776 can cause transmission damage, overheating, or sudden loss of drive. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Solenoid replacement ranges from $200-$500, but if internal damage is found, a rebuild or replacement can cost $1,500-$4,000.