What Does P0658 Mean?
The actuator supply voltage circuit 'A' is reading lower than the minimum threshold. The ECM has detected that the voltage being supplied to engine actuators on this circuit has dropped below specification. Actuators may operate sluggishly or fail to activate. The driver may notice degraded performance in systems controlled by solenoids and motors on this supply line.
Common Causes
30%
High-resistance connection in the actuator supply circuit (corroded terminal, loose pin)
25%
Weak or underperforming relay providing actuator supply voltage
20%
Excessive current draw from a partially shorted actuator dragging down the supply voltage
15%
Low system voltage from failing alternator or weak battery
10%
ECM internal voltage monitoring circuit reading low due to internal reference shift
Diagnostic Steps
1
Verify system voltage first: battery should read 12.4V+ with engine off, 13.5-14.7V with engine running. Low charging system voltage will cause this code across multiple circuits.
2
At the ECM connector, measure the actuator supply 'A' voltage pin with key on. Compare to battery voltage — it should be within 0.5V. A significant drop indicates resistance in the supply path.
3
If voltage is low at the ECM, trace the supply path upstream. Measure voltage at the relay output, fuse output, and battery terminal. Identify where the voltage drop occurs using voltage drop testing (each connection should drop less than 0.1V).
4
Disconnect actuators on this circuit one at a time and monitor supply voltage. If voltage recovers after disconnecting a specific actuator, that actuator has excessive current draw and should be tested for internal short.
5
Check all connections in the supply path for corrosion. Even light corrosion on relay sockets or fuse terminals can cause enough voltage drop to trigger this code.
Estimated Repair Cost
$25 - $600
Parts + labor, varies by vehicle and location
The actuator supply voltage circuit 'A' is reading lower than the minimum threshold. The ECM has detected that the voltage being supplied to engine actuators on this circuit has dropped below specification. Actuators may operate sluggishly or fail to activate. The driver may notice degraded performa...
The most common cause of P0658 (Actuator Supply Voltage "A" Circuit Low) is: High-resistance connection in the actuator supply circuit (corroded terminal, loose pin)
Typical repair costs for P0658 range from $25 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Actuators operating at reduced voltage may not function reliably. Performance degradation is likely, and if critical actuators are affected, the vehicle may enter limp mode. Safe to drive to a repair facility at moderate speeds.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0658 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Actuator Supply
Difficulty
Type
Generic (SAE)
Recommended Tools
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