Code
C0587
HUMMER
C — Chassis
Left Rear Solenoid Circuit Low
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring in the left rear solenoid circuit
- Corroded, loose, or contaminated connector at the left rear solenoid
- Short to ground on the solenoid supply or control wire
- Failed left rear solenoid (coil open or shorted)
- Faulty ABS/hydraulic control module (HCU) driver output
- Blown fuse or faulty power/ground to the ABS module
Symptoms
- ABS and/or traction control warning lamp illuminated
- Possible reduced or disabled ABS/ESC functionality for left rear wheel
- Stored C0587 in ABS control module memory (may be accompanied by other ABS codes)
- Intermittent fault that may appear under certain conditions (after rain, wheel movement)
What to check
- Retrieve ABS codes and freeze-frame/live data with a capable scan tool
- Visually inspect left rear wheel area wiring, connectors, and harness for damage, corrosion, or moisture
- With ignition ON, backprobe solenoid connector and check supply and control voltages
- Measure solenoid coil resistance with ignition OFF and connector disconnected
- Check module supply fuses, relays, and ground points related to ABS/ESC
- Wiggle wiring and connectors while monitoring live data or voltage to reproduce intermittent faults
Signal parameters
- Ignition ON: ABS power supply ≈ battery voltage (~12 V) to solenoid power feed (exact value per vehicle)
- Control signal: pulsed output from ABS/HCU when actuating solenoids (varies with ABS events)
- Typical solenoid coil resistance: generally low — single digit to a few tens of ohms (e.g., ~5–30 Ω); exact spec varies by model — consult service manual
- Current draw during activation: typically hundreds of mA to a few amps depending on design
- Note: exact voltage, resistance and current specifications vary by model — confirm with factory service literature before replacing components
Diagnostic algorithm
- Connect a scan tool and record stored codes, freeze-frame data, and live data. Note any related ABS or wheel speed sensor codes.
- Visually inspect left rear wiring harness, connector, and solenoid for corrosion, damage, or water ingress. Repair visible damage.
- With ignition OFF, disconnect the solenoid connector. Measure coil resistance between the solenoid terminals. Compare to factory spec (if unavailable, expect a low ohm reading rather than open or infinite).
- Inspect and test continuity of the solenoid wiring: from solenoid connector back to the ABS/HCU connector. Check for shorts to ground or open circuits.
- With ignition ON (engine off), backprobe the power feed to the solenoid connector and verify battery voltage is present at the feed circuit. If no feed, check ABS fuses/relays and module power/grounds.
- Command the solenoid ON using a diagnostic tool (if supported) and observe voltage/current at the solenoid. If the module commands but voltage is low or absent, suspect wiring/fuse/connector. If voltage pulses appear but solenoid does not energize, suspect solenoid fault.
- Perform a wiggle test of harness/connectors while monitoring live data/voltage to detect intermittent faults.
- If wiring and connectors test good but solenoid still fails, swap with a known-good identical solenoid (if feasible) or replace the left rear solenoid and retest.
- If new solenoid still reports low, suspect ABS/HCU driver circuit failure — verify module grounds and power, then consider module repair/replacement per factory procedures.
- Clear codes and perform a road test/ABS activation test to confirm repair and that code does not return.
Likely causes
- Corroded/loose connector at left rear solenoid
- Open or shorted wiring between the HCU and left rear solenoid
- Failed left rear solenoid coil
- Faulty ABS hydraulic control module output stage
Fault status
Status
Left Rear Solenoid Circuit Low — ABS/ESC control unable to correctly drive left rear solenoid. ABS/traction control may be limited or disabled for that wheel until repaired.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HUMMER
-
HUMMER: 2009
-
HUMMER: 2008
-
HUMMER: 2007
-
HUMMER: 2005
-
HUMMER: 2004
-
HUMMER: 2000
-
HUMMER: 1999
-
HUMMER: 1994
-
HUMMER: 1993
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email