OBD-II Generic Error Code P0925: How to Fix It

Q: Can I still drive my car with a P0925 code?

You may be able to drive short distances, but it is not recommended for extended use. P0925 indicates a problem in the reverse gear actuator circuit, which can cause reverse to engage improperly or not at all. Continuing to drive without addressing it could cause further transmission damage or leave you unable to back up when needed. Have it diagnosed as soon as possible.

Q: What causes the P0925 code to appear?

The most common causes of P0925 include damaged or shorted wiring in the reverse actuator circuit, corroded or loose transmission connector pins, a failed or out-of-spec reverse gear shift actuator solenoid, low or contaminated transmission fluid affecting solenoid operation, and in rarer cases, a faulty transmission control module (TCM) or PCM.

Q: How much does it cost to fix a P0925 code?

Repair costs vary widely depending on the root cause. A wiring repair or connector cleaning might cost $50–$150 in parts and labor. Replacing a transmission actuator solenoid typically runs $150–$400 including parts and labor. If the TCM needs replacement and reprogramming, costs can range from $400 to over $1,000 depending on the vehicle. Always get the root cause diagnosed before authorizing expensive part replacements.

Q: Is P0925 the same as a bad shift solenoid?

P0925 is specifically related to the reverse gear shift actuator circuit reading a low voltage, which is often caused by a failed solenoid but can also be caused by wiring issues or a faulty control module. A bad shift solenoid in general might trigger different related codes such as P0750–P0770. Testing the actuator's resistance and the circuit voltage is the only way to confirm whether the solenoid itself is the problem.

Q: Will a transmission fluid change fix P0925?

A transmission fluid change alone is unlikely to fix P0925 unless low or severely degraded fluid was the only contributing factor affecting solenoid operation. However, checking and servicing the transmission fluid is always a recommended first step in transmission diagnostics, since dirty or low fluid can cause solenoids and actuators to underperform. If the fluid checks out fine, you will need to move on to electrical testing of the circuit.

Abstract

The P0925 code means your vehicle's powertrain control module (PCM) has detected a low voltage signal in the gear shift reverse actuator circuit, which is part of your automatic transmission control system. This actuator helps the transmission physically engage reverse gear, and when the circuit voltage drops below the expected range, the PCM flags this fault. While you may still be able to drive the vehicle short distances, ignoring this code can lead to transmission shifting problems, including difficulty or inability to engage reverse gear.