What Does C0593 Mean?
C0593 indicates the Anti-lock Brake System (ABS) control module has detected an abnormally high voltage in the right rear wheel speed sensor solenoid circuit, specifically in the pressure modulation valve solenoid. This typically means voltage is present when it shouldn't be, suggesting a short to power or an internal solenoid failure. The ABS module monitors solenoid circuit resistance and current draw, and triggers this code when voltage exceeds manufacturer specifications.
Safety Warning
Vehicle may have reduced or disabled ABS functionality on the right rear wheel, significantly increasing stopping distances on slippery surfaces and risk of wheel lockup during emergency braking. Vehicle is technically drivable but should be repaired immediately as braking performance is compromised.
Common Causes
35%
Shorted right rear ABS solenoid valve or internal short within the hydraulic control unit (HCU)
30%
Wiring harness short to power between ABS module and right rear solenoid connector
20%
Corroded or damaged ABS module connector causing cross-circuit short
15%
Failed ABS control module with internal circuit fault
Diagnostic Steps
1
Step 1: Perform visual inspection of right rear ABS solenoid wiring harness from wheel well to ABS module, checking for chafed insulation, pinched wires, or signs of shorts to power sources. Pay special attention to areas near suspension components and body mounts.
2
Step 2: Disconnect the ABS hydraulic control unit connector and use a digital multimeter to measure resistance of the right rear solenoid circuit at the HCU connector. Compare readings to manufacturer specifications (typically 2-6 ohms). Check for continuity to battery voltage which would confirm a short to power.
3
Step 3: With HCU connector still disconnected, inspect connector terminals for corrosion, bent pins, or moisture intrusion. Measure voltage at the suspected circuit pin with ignition on; any voltage present indicates a wiring short upstream of the HCU.
4
Step 4: If wiring tests normal, perform solenoid activation test using bidirectional controls in scan tool to cycle the right rear solenoid while monitoring current draw. Excessive current or inability to control indicates internal HCU solenoid failure.
5
Step 5: Clear codes, perform test drive with multiple ABS activation events, and verify repair by monitoring live data for proper solenoid operation and absence of high voltage flags.
Estimated Repair Cost
$150 - $1,800
Parts + labor, varies by vehicle and location
C0593 indicates the Anti-lock Brake System (ABS) control module has detected an abnormally high voltage in the right rear wheel speed sensor solenoid circuit, specifically in the pressure modulation valve solenoid. This typically means voltage is present when it shouldn't be, suggesting a short to p...
The most common cause of C0593 (Right Rear Solenoid Circuit High) is: Shorted right rear ABS solenoid valve or internal short within the hydraulic control unit (HCU)
Typical repair costs for C0593 range from $150 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may have reduced or disabled ABS functionality on the right rear wheel, significantly increasing stopping distances on slippery surfaces and risk of wheel lockup during emergency braking. Vehicle is technically drivable but should be repaired immediately as braking performance is compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0593 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Brake System (ABS)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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