P0657Generic code

P0657 Code: Actuator Supply Voltage "A" Circuit/Open

The P0657 code means the actuator supply voltage A circuit is open, so the component does not get current when it is commanded on. Several actuators can stop working at once. Check the fuse, relay, connector and wiring first.

Severity
High
Can I keep driving?
Yes, but with caution
Estimated cost
$20 to $500
Difficulty
Medium
System
Computer and Outputs
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

On this page

What the P0657 code means

Some computers power a group of actuators (solenoids, valves, relays) from an output of their own or from a main relay. The computer monitors that supply.

The computer watches the control circuit from its own driver transistor. The P0657 code flags an open circuit: the component does not get current when it is commanded on. Before you replace the component, check the fuse, relay, connector and wiring, which are the most common causes.

If the supply fails, every actuator in the group stops working at the same time. Codes for several valves can appear and the engine can run in limp mode. Look for a shorted actuator that is dragging down the shared supply.

Measure the resistance of the component at its connector. If it is infinite, the component is open inside. If it is correct, follow the control wire back to the computer looking for a break, especially in the sections near the exhaust and at inline connectors.

P0657 code symptoms

  • Check engine light or another warning light on.
  • Several actuators stop working.
  • Codes for several actuators at the same time.
  • Limp mode.

Likely causes of the P0657 code

  1. Unplugged connector or one with a broken lock.
  2. Open coil. Infinite resistance.
  3. Cut wire. Check the areas where the harness rubs.
  4. Blown fuse. Often caused by an earlier short.

How to diagnose the P0657 code step by step

  1. Activate the component with the scan tool and check whether it responds.
  2. Check the fuse and relay. Measure the voltage on both sides of the fuse, and swap the relay with an identical one.
  3. Measure the supply at the connector. You should see battery voltage with the key on or when the component is activated.
  4. Measure the resistance of the component and compare it with the manual. Also check the insulation to ground.
  5. Check the control wire for continuity to the computer and for shorts.
  6. Unplug the actuators in the group one at a time until the supply comes back.

How to fix the P0657 code

  • Repair the connector, the wiring or the power supply.
  • Replace the actuator supply if it does not respond even with correct power and command signals.
  • Clear the codes and verify the repair.

Technical reference data

  • Supply voltage: battery voltage.
  • Reference values: check the manufacturer data for your vehicle.

Brand-specific notes

This code is frequent on two makes in particular.

P0657 on Chrysler

Frequent on Chrysler.

P0657 on Dodge

Frequent on Dodge.

Frequently asked questions about P0657

Can I drive with a P0657 code?
Yes, with caution. Several actuators may stop working and the engine may drop into limp mode, so avoid long trips until it is fixed.
What does actuator supply voltage A do?
Some computers power a group of actuators (solenoids, valves, relays) from an output of their own or a main relay, and the computer monitors that supply.
Do I always have to replace the part?
No. Check the fuses, relays, connectors and wiring first, because they are the most common cause.
How much does it cost to fix P0657?
As a rough guide, between $20 and $500. A fuse or connector repair is at the low end.
What does the P0657 code mean?
It is a generic OBD2 code that means the actuator supply voltage A circuit is open, so the actuators get no current when commanded.
What is the most common cause of P0657?
An unplugged connector, a cut wire or a blown fuse. A fuse that blew because of an earlier short is a common story behind a P0657 code.

Related codes

Questions about the P0657 code

There are no questions about this code yet. Tell us about your case: vehicle, symptoms and what you have already checked.