C0151 critical

Left Rear ABS Inlet Valve Solenoid Malfunction

The C0151 code means the vehicle's onboard diagnostic system has detected: Left Rear ABS Inlet Valve Solenoid Malfunction. This is a critical severity code.

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Keep driving?: Short distances only
DIY difficulty: hard
Estimated cost: $400 - $1500 (parts and labor)

Read ABS Codes

BlueDriver Bluetooth Pro Scanner

Basic scanners cannot read ABS codes. BlueDriver reads all systems including ABS, SRS, and transmission through your phone.

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Read ABS Codes

LAUNCH CRP123X (Reads ABS + Chassis)

Basic scanners cannot read ABS codes. This one reads all four systems so you know exactly which sensor failed.

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Common Symptoms

ABS warning light on
Left rear wheel locks under heavy braking
Vehicle sways during ABS activation
Traction control light on
Stability control disabled

Probable Causes (Ranked by Likelihood)

Failed left rear ABS inlet valve solenoid Very High
Contaminated brake fluid blocking the valve High
Internal corrosion in ABS modulator passages Moderate
Electrical open or short in solenoid coil Moderate
ABS module driver circuit malfunction Low

Step-by-Step Diagnostic Procedure

Scan for all ABS-related DTCs
Perform an ABS automated bleed with a compatible scan tool
Check brake fluid color and condition -- replace if dark or contaminated
Listen for individual solenoid valve clicks during self-test
Test solenoid coil resistance through the ABS module connector if possible

Frequently Asked Questions

Is a rear ABS valve failure as dangerous as a front?

A rear ABS valve failure is still serious but somewhat less critical than a front because rear brakes handle less of the braking force. However, a locked rear wheel can cause the vehicle to spin, especially on slippery roads.

Can I still use my brakes normally with C0151?

Your standard brakes will still work. The issue only manifests during ABS activation. However, without ABS on that corner, the left rear wheel can lock up during hard braking, reducing control.

What does it cost to replace an ABS modulator?

An ABS modulator assembly typically costs $400 to $1000 for the part. Labor runs $150 to $400 depending on the vehicle. Remanufactured units are often available at lower cost.