P0657 Actuator Supply Voltage A Circuit/Open
OBD-II Trouble Code Technical Description
Actuator Supply Voltage A Circuit/Open
What does that mean?
This is a generic powertrain diagnostic trouble code (DTC) and typically applies to OBD-II vehicles. Vehicle makes may include but aren't limited to Dodge, Chrysler, Ford, Chevrolet, Toyota, Honda, Nissan, etc.
The ECM (Engine control module) is not only responsible for monitoring and adjusting numerous sensors, solenoids, actuators, valves, etc.. but also for making sure all of these components are operating seamlessly and in conjunction to meet desired values. All of this to ensure you get the most economy and performance out of your vehicle as possible. In this case, if you get a P0657 or related code, depending on your make and model, you may be experiencing transmission drivability issues.
It's important to note, in my experience with European models, I have also seen this code as an EVAP diagnostic code. Having highlighted the potential differences, it should go without saying, you need to refer to your service manual to ensure proper diagnostic direction. Most times, your symptoms will be a strong indicator as to what systems/ components you will be working with to rectify the fault.
When it comes to the P0657 and related codes, the ECM has detected an abnormal value within the actuator supply voltage circuit. It recognizes the abnormality by comparing the actual values to desired ones. If they go outside of a desired scope, it illuminates the MIL (Malfunction indicator lamp) on your instrument panel. It must monitor this fault through multiple drive cycles before illuminating the MIL. Make sure to research the designation for "A" within the circuit. Depending on your make and model, this could designate a certain wire, harness, location, etc. That said, always use OEM (Original equipment manufacturer) technical service information for this.
This could also be detected by the TCM (Transmission control module) depending on what description your particular make and model has for this code.
P0657 (Actuator Supply Voltage A Circuit/Open) is is active when the ECM or TCM has detected an open (or general malfunction) within the actuator supply voltage "A" circuit
What is the severity of this DTC?
Severity here is set to moderate, generally speaking. Given the fact that there are multiple code descriptions, you should use caution when diagnosing. Proper service data will be necessary. If this happens to be a transmission code in your case, you definitely want to repair this sooner rather than later. Daily usage of a vehicle with an active transmission code is a risk that we do not want to take.
What are some of the symptoms of the code?
Symptoms of a P0657 diagnostic code may include:
Poor shifting Lack of torque Stuck in gear CEL (Check engine light) illuminated Overall poor drivability Limited power output Poor fuel mileage Abnormal engine revving/speedsWhat are some of the common causes of the code?
Causes for this P0657 trouble code may include:
Open/chafed wire Water intrusion Melted/broken connector(s) Short to power General electrical issue (e.g. charging system issue, wrong battery, etc.)What are some P0657 diagnostic and troubleshooting steps?
The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSB) for known issues with the specific vehicle.
Advanced diagnostic steps become very vehicle specific and may require the appropriate advanced equipment and knowledge to perform accurately. We include basic steps below but refer to a vehicle year/make/model/powertrain specific repair guide for specific steps for your vehicle.
Basic Step #1
How you will approach your diagnosing of this will depend on your make and mod
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