C0110 explained: The ABS pump motor circuit has a fault. Same root causes as C0020. Most common on GM trucks and SUVs as a precursor to full ABS module failure.
🎯 Top Causes & Probability
52%
#1 - Most Likely
Failed ABS Pump Motor
Brushes worn or motor seized. Replacement of the motor pack or full modulator is the fix.
🔨 Part
$220-$650
👨🔧 Labor
$180-$320
⚡ DIY
Hard
28%
#2 - Check First
ABS Module / Driver Failure
Internal pump driver FET in the module shorts or opens. Module rebuild from a specialist is the cheapest path.
🔨 Part
$180-$900
👨🔧 Labor
$120-$240
⚡ DIY
Medium
16%
#3 - Less Common
Wiring or Connector Corrosion
Heavy-gauge pump wires corrode at the module. Clean and re-pin can restore function.
🔨 Part
$0-$60
👨🔧 Labor
$80-$220
⚡ DIY
Medium
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Listen for the ABS self-test buzz with key-on. A silent pump points at the motor or driver.
- Inspect the ABS module connector for green corrosion, especially on GM trucks.
- Measure pump motor resistance across the heavy terminals.
- Command the pump with a scan tool. No response means driver or module fault.
- Replace pump, motor pack, or have the module rebuilt as indicated.
❓ Frequently Asked Questions
How is C0110 different from C0020?
On most GM trucks they are the same fault under different module software versions. Treatment is identical.
Can I drive with C0110?
Base brakes work, but ABS and stability are disabled. Drive gently and avoid hard stops on slick roads.
Should I rebuild or replace the module?
Rebuild from Module Master or BBA Reman is typically half the price of new and has a lifetime warranty.
Will a battery disconnect clear C0110?
Only temporarily. It returns when the self-test runs again, usually within one or two key cycles.