A P0508 code on your 2023 Chevrolet Equinox indicates a low voltage condition in the idle air control system circuit. While modern vehicles use electronic throttle control rather than traditional IAC valves, this code still monitors related circuitry.
Electronic Throttle Idle Control
The 2023 Equinox uses electronic throttle body (ETB) for all throttle control including idle management. P0508 may relate to the throttle body motor circuit, position sensor circuit, or related control components showing low voltage.
Low Circuit Interpretation
A low voltage reading indicates either a short to ground in the circuit or a component pulling voltage below normal operating range. The ECM expects specific voltage levels from idle control components and flags low readings.
Potential Causes
Throttle body motor circuit has a short to ground. Throttle position sensor circuit is shorted. Connector corrosion creates ground paths. Internal throttle body electronics have failed. Wiring damage allows shorts to chassis.
Diagnostic Steps
Use GM GDS2 to identify which specific circuit is reading low. Check throttle body connector for corrosion or damage. Test circuit resistance to ground—shouldn't be near zero ohms. Inspect wiring for damage, especially near heat sources. If the throttle body is suspect, resistance testing of internal components may be needed.