C0265 explained: The electronic brake control module relay, which powers the ABS valves, has failed or is intermittent. Almost always cracked solder joints inside the module. Rebuild is the cheap fix.
🎯 Top Causes & Probability
65%
#1 - Most Likely
Cracked Solder Joints in ABS Module
Very common on 1999-2007 GM trucks. The internal relay solder cracks and intermittently loses contact. Module rebuild from a specialist solves it.
🔨 Part
$180-$300
👨🔧 Labor
$120-$220
⚡ DIY
Medium
22%
#2 - Check First
Failed Internal Relay
The relay itself fails open or sticks. Same fix as cracked solder, module rebuild or replacement.
🔨 Part
$180-$900
👨🔧 Labor
$120-$220
⚡ DIY
Medium
10%
#3 - Less Common
Power Supply Wiring Issue
Less common, but a corroded power feed or ground to the module can mimic relay failure.
🔨 Part
$0-$60
👨🔧 Labor
$80-$160
⚡ DIY
Medium
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Confirm the code with a bidirectional scan tool that can read ABS data.
- Inspect the module connector for green corrosion and clean if needed.
- Check module power and grounds with a meter.
- If supply is good, the module needs rebuild. Send to Module Master, BBA Reman, or similar.
- After install, bleed brakes and clear codes. Drive cycle to verify.
❓ Frequently Asked Questions
Is rebuilding the module safe?
Yes. Reputable rebuilders carry a lifetime warranty and the work is well-documented for these GM platforms.
How long does a rebuild take?
Typically 2-3 business days plus shipping. Some shops offer same-day exchange units.
Can I rebuild the module myself?
YouTube has guides for re-soldering GM EBCM units. It is doable with a fine-tip iron, but a professional rebuild is more reliable.
Will the speedometer act up too?
On some GM trucks, yes. The EBCM passes wheel speed to the cluster, and a failing module can cause speedometer dropouts as well.