May be your abs control module. Check autoecu.com and call the number listed and technical support can help and repair this abs control module if it is bad . They just repaired mine for the same problem you are having. My truck is a 2001 GMC Sonoma SLS with the extended cab. It works fine now. You need to pull the 60 amp fuse for the abs system that is under the hood to keep the pump from running all the time so it want drain your battery down. If the pump keeps running all the time it can damage it also and they are expensive.
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