Generally, solenoid replacement is usually the root cause on cars with under 40K miles, but I can't say that it's out of the realm of possibility.
Here's how the circuit works....
Hydraulic pressure to each clutch is controlled by the shift valve. The shift valve activates according to the combination of the shift solenoid valves A, B, and C ON/OFF status. Hydraulic pressure supply in D5 range is shown above. The powertrain control module (PCM) computes the actual ratio of mainshaft and countershaft revolutions of the transmission.
If a difference between the actual ratio and commanded gear occurs when shifting to each gear position, a malfunction in the shift solenoid valve or the hydraulic pressure system is detected and the DTC you're getting pops up.
In order to repair the issue, you'll need access to specific equipment that can graph clutch pressures at each gear change. For that, you'll most likely need to bring the vehicle in to a specialty transmission shop, or your Acura dealer.
Here's how the circuit works....
Hydraulic pressure to each clutch is controlled by the shift valve. The shift valve activates according to the combination of the shift solenoid valves A, B, and C ON/OFF status. Hydraulic pressure supply in D5 range is shown above. The powertrain control module (PCM) computes the actual ratio of mainshaft and countershaft revolutions of the transmission.
If a difference between the actual ratio and commanded gear occurs when shifting to each gear position, a malfunction in the shift solenoid valve or the hydraulic pressure system is detected and the DTC you're getting pops up.
In order to repair the issue, you'll need access to specific equipment that can graph clutch pressures at each gear change. For that, you'll most likely need to bring the vehicle in to a specialty transmission shop, or your Acura dealer.
