What Does C0080 Mean?
This code indicates the ABS control module has detected an electrical fault in the solenoid valve circuit for the left rear wheel's primary hydraulic control valve. The ABS module monitors the solenoid's resistance and current draw, and has identified either an open circuit, short circuit, or abnormal resistance that prevents proper brake pressure modulation. This affects the vehicle's ability to prevent wheel lockup during hard braking on the left rear wheel.
Safety Warning
The vehicle is safe to drive but the ABS function for the left rear wheel is compromised, which may result in wheel lockup during hard braking and increased stopping distances on slippery surfaces. The ABS warning light will remain illuminated. Repair should be completed promptly, especially before winter or wet weather conditions.
Common Causes
45%
Damaged or corroded ABS solenoid valve connector or wiring harness between ABS module and left rear wheel solenoid
35%
Failed ABS hydraulic control unit with internal solenoid valve failure
15%
Corroded or broken ground connection for ABS module or hydraulic unit
5%
Failed ABS control module with internal driver circuit failure
Diagnostic Steps
1
Step 1: Perform visual inspection of the ABS wiring harness from the control module to the hydraulic unit, checking for chafed, pinched, or corroded wires, especially near the left rear wheel area and along frame rails where harness routing occurs
2
Step 2: Using a digital multimeter, disconnect the ABS hydraulic unit connector and measure resistance of the left rear solenoid valve circuit (typically pins specific to LR solenoid #1, consult wiring diagram). Normal resistance should be 2-6 ohms; infinite resistance indicates open circuit, 0 ohms indicates short to ground
3
Step 3: Check for voltage supply at the hydraulic unit connector with ignition on using multimeter. Verify battery voltage is present on power supply pins and check for clean ground continuity (less than 1 ohm resistance to known good ground)
4
Step 4: If wiring and resistance checks pass, perform ABS solenoid functional test using advanced scan tool to command the left rear solenoid #1 on/off while monitoring current draw. Normal operation should show audible clicking and current draw of 1-3 amps
5
Step 5: Inspect all ABS module and hydraulic unit ground points for corrosion, remove ground bolts, clean contact surfaces with wire brush, apply dielectric grease and reinstall with proper torque
6
Step 6: Clear codes, perform test drive with multiple hard braking events from 40 mph on dry pavement, then re-scan for code return. If code returns immediately without driving, replace hydraulic control unit; if code returns only under operation, recheck wiring integrity
Estimated Repair Cost
$150 - $1,800
Parts + labor, varies by vehicle and location
This code indicates the ABS control module has detected an electrical fault in the solenoid valve circuit for the left rear wheel's primary hydraulic control valve. The ABS module monitors the solenoid's resistance and current draw, and has identified either an open circuit, short circuit, or abnorm...
The most common cause of C0080 (Left Rear ABS Solenoid #1 Circuit Malfunction) is: Damaged or corroded ABS solenoid valve connector or wiring harness between ABS module and left rear wheel solenoid
Typical repair costs for C0080 range from $150 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive but the ABS function for the left rear wheel is compromised, which may result in wheel lockup during hard braking and increased stopping distances on slippery surfaces. The ABS warning light will remain illuminated. Repair should be completed promptly, especially before winter or wet weather conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0080 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
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