P0657 LEXUS - Actuator Supply Voltage Circuit Open
P0657 LEXUS Possible Causes
- Faulty Engine Control Module (ECM)
- Engine Control Module harness is open or shorted
- Engine Control Module circuit poor electrical connection
- Engine Control Module Programming update
First diagnose P0657 LEXUS code
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.
P0657 LEXUS Tech NotesCheck the ECM fuse, if fuse is OK try erasing the code first and if the code comes back you may have to reprogram or replaced the ECM.
Cost of diagnosing the P0657 LEXUS code
Labor: 1.0The cost of diagnosing the P0657 LEXUS code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the P0657 LEXUS code detected?Indicates the Engine Control Module (ECM) has experienced an internal memory fault.
P0657 LEXUS Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0657 Lexus DescriptionThe Engine Control Module (ECM) continuously monitors its internal memory status, internal circuits, and output signals to the throttle actuator. This self−check ensures that the ECM is functioning properly. If any malfunction is detected, the ECM will set the code and illuminate the engine light.
The ECM memory status is diagnosed by internal mirroring of the main CPU and the sub CPU to detect Random Access Memory (RAM) errors. The two CPUs also perform continuous mutual monitoring. The ECM illuminates the MIL and sets a DTC if: 1) outputs from the two CPUs are different or deviate from the standards, 2) the signals sent to the throttle actuator deviate from the standards, 3) a malfunction is found in the throttle actuator supply voltage, and 4) any other ECM malfunction is found.
P0657 LEXUS More InformationNeed more information on how to fix the P0657 LEXUS code?
Get Access to Factory Service Manuals
Need more help?Get the P0657 Lexus code diagnosed by a professional: Find a repair shop in your area
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