P0776 Code: Pressure Control Solenoid B Performance or Stuck Off
Pressure control solenoid B isn't delivering the pressure the TCM asks for – harsh or slipping shifts.
At a glance
Severity: Moderate
- Meaning
- Pressure Control Solenoid B Performance or Stuck Off
- System
- Transmission · Powertrain
- Safe to drive?
- With caution
- Typical repair cost
- $100–$6,500
- DIY difficulty
- Hard
Unlike simple on/off shift solenoids, pressure control solenoids (PCS) are variable valves: the TCM feeds them a controlled current to set exactly how hard a clutch applies, or how high line pressure runs. PCS B is the second of these, and its job depends on the design – on Honda 5-speed automatics it is one of the externally mounted clutch pressure control (linear) solenoids, on Nissan CVTs it regulates secondary pulley pressure, and on GM's 6-speed units it feeds one of the clutches. P0776 means the circuit looks electrically fine, but the result – a shift time, clutch slip or measured pressure – shows the valve isn't regulating properly, typically because it's sticking, contaminated or leaking. The usual outcome is harsh or flared shifts and, if it's bad enough, limp mode.
Can I keep driving? Usually drivable with care, but shifts may bang or slip and the transmission can drop into limp mode. Avoid heavy loads and hard acceleration, since a clutch applied at the wrong pressure wears fast.
How to read P0776
- P Powertrain
- 0 Generic (SAE)
- 7 Transmission
- 76 Specific fault
Symptoms
- Harsh or banging upshifts, often on one particular shift
- RPM flare or slip during a shift
- Delayed or hard engagement into Drive or Reverse
- Judder or a whining noise on CVT-equipped cars
- Limp mode with reduced power or a fixed gear
- Check engine light, sometimes a flashing D or transmission warning
Possible causes
Ranked by how often each cause is behind this code (editorial estimate).
- PCS B spool sticking due to varnish or debris
- Low, degraded or incorrect fluid (wrong ATF or CVT fluid)
- Valve body wear or leaking circuit downstream of the solenoid
- Clogged solenoid screen or filter
- Worn clutch pack or seals in the circuit PCS B controls
- Outdated TCM software or lost shift adaptations
Diagnosis step by step
Check fluid type, level and condition
Confirm the fluid is the exact type required – Honda ATF, Nissan CVT fluid or the GM spec – and that the level is correct at temperature. Mixing in a 'universal' fluid is a well-known trigger for pressure control codes.
Tools: Flashlight, Towels & shallow pan
Compare commanded and actual values
On a scan tool, look at PCS B commanded current or pressure and, where available, actual current or the matching pressure sensor reading. A good circuit that tracks its commanded current while the pressure or shift result doesn't respond points to a sticking valve.
Tools: OBD-II scanner
Measure solenoid resistance
Pressure control solenoids are low-resistance, often only a few ohms. A reading that is in spec supports a hydraulic fault; a reading far out of range means you're looking at a circuit problem that should have set a different code.
Tools: Multimeter
Pressure-test the circuit
Where the transmission has test ports, a shop connects a gauge and compares line or clutch pressure with the factory chart while the TCM varies PCS B. Low or unstable pressure confirms the solenoid or valve body.
Tools: OBD-II scanner
Replace the solenoid and clean screens
On transmissions with external or easily reached solenoids, replace PCS B and any filter screen in its feed. On CVTs and many modern units the solenoid is part of the valve body, which is replaced as an assembly.
Tools: Torque wrench, Towels & shallow pan
Update software and relearn
Check for TCM software updates and perform the shift adaptation relearn after any repair or fluid change. Without it, shifts may stay harsh and the code can return.
Tools: OBD-II scanner
Where the parts are
- 1Battery
- 2Alternator
- 3Engine computer (ECM)
- 4CAN bus
- 5Transmission
- 6Wheel speed sensor
- 7High-voltage battery
Repair options & costs
| Repair | DIY? | Estimated cost |
|---|---|---|
| Fluid change with correct fluid and relearn | No | $150–$400 |
| Replace pressure control solenoid B (external/accessible) | No | $250–$700 |
| Replace valve body with integrated solenoids | No | $900–$2,200 |
| TCM software update and adaptation reset | No | $100–$250 |
| Transmission or CVT replacement | No | $3,000–$6,500 |
Rough US estimates for parts and labor; shop rates vary by region. Not a quote.
Notes by brand
Honda
Honda 5-speed automatics in the Accord, Odyssey and Pilot use externally mounted clutch pressure control (linear) solenoids. Pressure control solenoid codes are often cured by replacing the solenoid and its screen and refilling with genuine Honda ATF.
Nissan
On Nissan CVTs (Rogue, Altima, Sentra and others), P0776 relates to the secondary pressure solenoid in the CVT control valve body. Correct Nissan CVT fluid is essential, and a valve body or complete CVT replacement is a common outcome when the fluid is heavily contaminated.
Emissions / smog test impact
Will fail
The check engine light is on with P0776, so the car fails an OBD smog or emissions inspection. After the repair, complete a few drive cycles so the monitors are ready.
Frequently asked questions
What's the difference between a shift solenoid and a pressure control solenoid?
A shift solenoid is basically on or off and moves a shift valve. A pressure control solenoid is proportional – the TCM varies its current to set precise pressures – so it controls how firm or soft a shift feels.
Can the wrong transmission fluid cause P0776?
Yes. Pressure control solenoids are calibrated for the friction and viscosity of a specific fluid. The wrong fluid can make shifts harsh or slippy and trigger performance codes.
Is P0776 serious on a CVT?
It can be. On a CVT, pressure control keeps the belt or chain from slipping on the pulleys, so ongoing pressure problems can damage the belt and pulleys. Get it diagnosed before it turns into a full CVT replacement.
What does P0746 have to do with P0776?
P0746 is the same type of performance fault for pressure control solenoid A. If both appear, suspect something common – contaminated fluid, a clogged filter or low line pressure – rather than two bad solenoids.