Code
C0594
HUMMER
C — Chassis
Right Rear Solenoid Circuit Open
AI status
Completed
Completed
100%
Causes
- Open or broken wiring between control module and right rear solenoid
- Disconnected, corroded, or bent connector pins at solenoid or module
- Faulty right rear solenoid (open coil)
- Blown fuse or failed relay supplying the solenoid circuit
- Poor or missing ground at solenoid circuit
- Intermittent contact due to damaged insulation or pinching
Symptoms
- ABS, traction, 4WD or service warning lamp illuminated (depending on system)
- Right rear actuation not occurring (no locking/valve movement)
- Loss of ABS/traction/4WD functionality or degraded performance
- Diagnostic trouble code C0594 stored and may be repeatable
- Possible limp-home behavior or reduced system capability
What to check
- Obtain full freeze frame and related codes with a compatible scan tool
- Visually inspect wiring and connectors at the right rear solenoid and module for damage, corrosion, or disconnection
- Check relevant fuses and relays for the solenoid power feed
- With ignition ON (engine off) command the solenoid with a bi-directional scan tool and observe for operation
- Back-probe the solenoid connector while commanding the solenoid to check for presence of activation voltage and ground
- Measure continuity/resistance of solenoid coil between connector pins with connector disconnected
Signal parameters
- Typical inactive circuit: open/infinite resistance reported at solenoid connector when disconnected from module (solenoid coil removed)
- Typical coil resistance: small DC resistance (commonly in the range of ~10–100 ohms for many solenoids) — consult vehicle-specific service data for exact value
- Activation voltage: approximately battery voltage (~9–14 V) present on power feed when solenoid commanded ON
- PWM activation: some systems use pulse-width modulation; frequency and duty vary by manufacturer — check service manual for specifics
Diagnostic algorithm
- Read and record all stored codes and freeze frame data. Check for related codes that might point to a common fault. Clear codes and attempt to re-create C0594 to confirm it is current.
- Visually inspect the right rear solenoid, harness, and connector for corrosion, bent pins, damage or signs of water intrusion. Repair or replace damaged components as needed.
- Check fuses and relays supplying the solenoid circuit; replace any blown fuses and test relays.
- With ignition ON, use a scan tool to command the right rear solenoid ON while back-probing the connector. Verify presence of expected activation voltage on the power lead and a proper ground or switching signal on the control lead.
- If no activation voltage is present, trace power feed back to the fuse/relay and check continuity. If activation voltage is present but solenoid does not operate, disconnect the solenoid and measure coil resistance. An open or infinite resistance indicates a bad solenoid.
- If coil resistance is normal but no activation occurs at the solenoid while commanded, check continuity between the control module output pin and the solenoid connector. Repair any open circuits or poor connections.
- If wiring and solenoid check good, test or replace the control module or module output driver if directed by manufacturer diagnostics.
- After repair, clear codes, perform functional test and road test to confirm repair. Re-scan for codes and monitor live data for proper operation.
Likely causes
- Damaged harness or chafed wire to right rear solenoid
- Connector corrosion or water intrusion at the wheel/solenoid connector
- Solenoid coil internal failure (open circuit)
- Blown fuse or failed relay in solenoid power feed
Fault status
Status
Right Rear Solenoid Circuit Open — control module detects an open or no continuity condition on the right rear solenoid circuit.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Repair manuals
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138
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