Powertrain
generic / SAE
P0657
Actuator Supply Voltage A Circuit Open
The supply rail that powers a group of actuators (typically injectors, EGR, throttle motor) is open. Multiple downstream actuators stop working.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / 57
Possible causes
- Supply relay open high
- Pin pushed back out of connector body low
- Cracked solder joint inside the module or sensor low
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Inspection / repair
- Difficulty: medium
- DIY: possible
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References
sae:J2012