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P0658 OBD-II Trouble Code: Actuator Supply Voltage “A” Circuit Low

Check Engine Light

P0658 code definition

The P0658 code detects a problem with the actuator supply voltage “A” circuit.

What the P0658 code means

The P0658 code is a generic OBD-II trouble code that signal an issue with the actuator supply voltage in a certain circuit area. The “A” circuit is not a specific component, but instead a region of the circuit. When the “A” region of the circuit has faulty actuator supply voltage, it will be detected by one of the control modules. This actuator supply voltage problem is usually detected by the powertrain control module (PCM), but any number of control modules can detect it, such as the cruise control module, instrument panel control module, fuel injection control module, anti-lock brake control module, and many others. When the PCM or another control module detects a fault in the actuator supply voltage, the P0658 code will be triggered.

What causes the P0658 code?

There are a handful of issues that can cause the P0658 trouble code to be detected, including:

  • Shorted or open wires or damaged connectors in the PCM input circuits from engine sensors
  • Shorted or open wires or damaged connectors in one of the interfacing control modules
  • Damaged or disconnected ground wires in either the PCM or another control module
  • Malfunctioning PCM or other control module

What are the symptoms of the P0658 code?

When the P0658 trouble code is detected, the check engine soon Warning Light will likely come on. The engine will likely perform poorly, which may result in difficulty starting, an inability to start, a misfiring cylinder, a rough running and less powerful engine, and diminished fuel economy.

How does a mechanic diagnose the P0658 code?

The P0658 code will be diagnosed using a standard OBD-II trouble code scanner. A reputable mechanic will use the trouble code scanner to look at the freeze frame data and assess the P0658 code. The mechanic will also search for additional trouble codes.

Next, the technician should reset the trouble codes and restart the vehicle, to see if the codes return. If the P0658 code does not return, it should be assumed that it was detected erroneously, or it represents an intermittent issue.

If the code returns, and is accompanied by other trouble codes, the P0658 code should be addressed first. The mechanic will begin by inspecting the wiring and connectors associated with the PCM, and the other control modules. This inspection should include the ground wires. Any loose, shorted, or damaged wires, or open or damaged connectors should be replaced. Following replacement, the codes should be reset and the vehicle restarted to see if the issue persists. Mechanics should do this after every replacement until the issue is resolved.

If no issues are found in the wires or connectors, the mechanic can inspect the controller area network (CAN). The CAN is a communication bus that serves as a communication network for the various control modules, and can provide insight into which module is sensing a problem, and if the module is malfunctioning.

Common mistakes when diagnosing the P0658 code

The most frequent mistake made when diagnosing the P0658 code is the failure to follow the standard OBD-II trouble code diagnosis protocol. The protocol should always be followed step by step, to ensure an efficient and successful inspection and repair.

Failure to follow the protocol can result in other trouble codes being assessed before the P0658 code, when the accompanying codes may only be present because of the issue detected by the P0658 code.

How serious is the P0658 code?

The severity of the P0658 code can vary greatly. It is possible that a vehicle with the P0658 code may not have any noticeable symptoms. However, most vehicles will experience some noticeable symptoms, which can be severe enough to keep the car from starting. Even if the vehicle is running, the P0658 code should be addressed as soon as possible to keep further damage from occurring.

What repairs can fix the P0658 code?

Some of the repairs for the P0658 code include:

  • Replacement of wires and connectors in the PCM or other control modules
  • Replacement of ground wires in the PCM or other control modules
  • In rare cases, replacement of the PCM or other control modules

Additional comments for consideration regarding the P0658 code

When the P0658 trouble code is detected, communication failure will be present, which may set off other trouble codes. If multiple codes are present, the P0658 code should be addressed and tested first, as the other codes may simply be a symptom of the P0658 code. If the PCM or another one of the control modules requires replacement, it will need to be reprogrammed as well.

Need help with a P0658 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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