GMC G 3500 Van ABS/Traction Control: DTC Descriptions

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Fig. 8

Rear Wheel Anti-Lock (RWAL) Brake System Codes 1, 11, & 12 diagnosis. ECU malfunction

Brakes and Traction Control
Antilock Brakes / Traction Control Systems / System Information
System Diagnosis / Diagnostic Trouble Code Descriptions
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