What this code means
P0757 may indicate that the transmission control system commanded shift solenoid valve B one way, but the hydraulic pressure response may not have matched what the controller was
What the vehicle may do
- The vehicle may show a warning lamp.
- It can have abnormal transmission behavior during certain drive mode transitions.
- In some cases, the driver may not notice a clear symptom.
Possible fault areas
- Possible shift solenoid valve B control or operation issue.
- Possible hydraulic shift valve B issue.
- Possible high clutch related issue.
- Possible internal e-CVT condition involving debris or clutch material.
Diagnostic path
Open and code logic
On this Accord Hybrid, P0757 is a command-versus-response type transmission code. In plain terms, the ICM may be commanding shift solenoid valve B off during the change from high clutch engagement into HV driving mode, but the hydraulic pressure feedback may still show pressure where it should not. A driver may notice abnormal shift feel, limited operation, warning lamps, or no obvious symptom at all. The broad fault areas can include the solenoid command side, hydraulic control through shift valve B, high clutch operation, or internal e-CVT debris or clutch material. Start with the basic system checks, then work the diagnostic path in order.
Check related high clutch faults first
Before chasing P0757 directly, look for any related high clutch fault or indicated high clutch system issue. If one is present, handle that first. This code depends on what happens during the high clutch transition, so skipping a related high clutch problem can send the diagnosis in the wrong direction.
Reproduce the operating condition safely
Next, raise the vehicle on a lift, make sure it is securely supported, and confirm all four wheels can rotate freely. Using the HDS direct input clutch test assistance mode, run the vehicle at a steady speed with the high clutch engaged for at least 10 seconds. When you slow it down, apply the brakes and bring the wheels to a stop gradually. Do not brake hard while the vehicle is running on the lift, because that can damage the driveline.
Test shift solenoid valve B
With the vehicle in ON mode, use the HDS shift solenoid test and command shift solenoid valve B. The normal result is an intermittent operating sound when it is switched ON and OFF. If that solenoid inspection is abnormal, the diagnostic path points to a problem with shift solenoid valve B.
Inspect the e-CVT fluid through a strainer
If the solenoid test is normal, move on to the transmission inspection. Drain the transmission fluid through a strainer, then inspect the strainer for metal debris or excessive clutch material. The normal finding is no metal debris and no excessive clutch material. If that inspection is abnormal, the diagnostic path points to a problem inside the transmission, e-CVT.
Final diagnostic direction and takeaway
If the earlier inspection items are normal, the remaining diagnostic direction is shift valve B. The key is to separate an electrical solenoid response problem from a hydraulic or mechanical problem, and not jump past the high clutch context or the fluid inspection. Verify the repair and confirm the code stays gone after the fault path has been corrected. For more diagnostic training, visit stepdiagnostics.com.
Final check
P0757 is often approached by confirming related high clutch context first, then separating solenoid operation from hydraulic or internal transmission concerns.
For more guided automotive diagnostics, visit STEP Diagnostics.
