LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1998 >> Forward Control 6.5 F >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Controls - Tests W/Codes - 4.3L) >> Diagnostic Trouble Codes >> DTC P1380 - Electronic Brake Control Module (EBCM) DTC Detected Rough Road Data Unstable >> Diagnostic Procedures
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Turn ignition off. Disconnect VCM and EBCM harness connectors. Using DVOM, check for open in serial data circuit between VCM and EBCM. If a problem is found, go to next step. If no problem is found, see ANTI-LOCK BRAKE SYSTEM article in BRAKES section.
  3. Repair as necessary. After repairs, go to next step.
  4. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, DTC is intermittent.
  5. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test.
scientia non olet · About LEMON Manuals