What Does C0085 Mean?
This code indicates the ABS control module has detected an electrical fault in the second solenoid valve circuit for the left rear wheel. The ABS module monitors the solenoid circuits for opens, shorts, or resistance issues that prevent proper operation of the hydraulic valve during anti-lock braking events. This solenoid controls brake pressure modulation during ABS activation.
Common Causes
35%
Failed ABS hydraulic control unit (HCU) with internal solenoid failure or stuck valve
30%
Damaged wiring harness or connector corrosion between ABS module and hydraulic unit
20%
Failed ABS control module with internal circuit driver failure
10%
Short to ground or power in solenoid control circuit wiring
5%
Poor ground connection at ABS module or hydraulic unit
Diagnostic Steps
1
Step 1: Perform visual inspection of ABS hydraulic unit and all connectors for corrosion, moisture intrusion, bent pins, or physical damage. Clean and dielectric grease connections as needed.
2
Step 2: Using a digital multimeter, measure resistance of left rear solenoid #2 at the hydraulic unit connector (disconnect harness). Typical specification is 2-8 ohms; compare to other solenoid readings for reference.
3
Step 3: Check for voltage supply and ground at the ABS module connector using multimeter with ignition on. Verify solenoid control circuit shows battery voltage when commanded inactive and near 0V when commanded active using active test function.
4
Step 4: Inspect wiring harness from ABS module to hydraulic unit for chafing, pinching, or damage. Pay special attention to areas where harness routes near sharp edges or moving components. Check for shorts to ground using ohmmeter with harness disconnected.
5
Step 5: If all wiring and connections test normal, perform solenoid actuation test using scan tool active commands. Listen and feel for solenoid clicking at hydraulic unit. Lack of operation with good electrical readings indicates internal HCU failure.
6
Step 6: Clear codes, test drive vehicle and attempt ABS activation in safe environment. Re-scan for code return. If code returns immediately without ABS activation, suspect ABS module internal fault.
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
This code indicates the ABS control module has detected an electrical fault in the second solenoid valve circuit for the left rear wheel. The ABS module monitors the solenoid circuits for opens, shorts, or resistance issues that prevent proper operation of the hydraulic valve during anti-lock brakin...
The most common cause of C0085 (Left Rear ABS Solenoid #2 Circuit Malfunction) is: Failed ABS hydraulic control unit (HCU) with internal solenoid failure or stuck valve
Typical repair costs for C0085 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains safe to drive with normal braking function intact, but ABS will be disabled or partially functional on the left rear wheel. ABS may not function properly during emergency braking situations, increasing stopping distances on slippery surfaces. Repair should be completed soon to restore full ABS capability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0085 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Braking System (ABS)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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