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C0266 ABS
EBCM Pump Motor Circuit Performance
C0266 indicates the EBCM pump motor circuit performance is out of range on GM-style systems. The pump is not delivering expected performance, so the module disables ABS.
🚗 Yes, but ABS and stability control are disabled, so fix it promptly.
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🎯 Top Causes, Ranked by Likelihood
#1 Failed pump motor or EBCM $300-$1000
Worn pump motor or internal driver fault in the module.
#2 Poor ground or power connection $50-$250
Corroded ABS ground or power feed reduces performance.
#3 Wiring or connector fault $50-$300
High resistance in the motor circuit wiring.
#4 Low system voltage $100-$300
Weak battery lowers pump motor performance.
🩺 Common Symptoms ABS warning light on Traction and stability control lights on Slow or weak ABS pump response ABS disabled 💰 Repair Cost: DIY vs Shop
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🔧 How to Diagnose C0266 1 Scan and record ABS codes
2 Inspect and clean ABS grounds and power connections
3 Check battery and charging voltage
4 Command the pump and observe response with a scan tool
❓ Frequently Asked Questions Can I drive with C0266?
Yes, normal braking works, but ABS and stability control are off. Fix it soon.
How much to fix C0266?
Cleaning grounds may resolve it, but a pump or EBCM repair can run $300-$1200.
What causes C0266 most often?
A weak pump motor, poor ABS grounds, or high resistance in the motor circuit.
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