GM Full-Size Trucks 1988-1998 Repair Information

Trouble Codes

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The following is a list of the trouble codes for the Rear Wheel Anti-Lock (RWAL) brake system.



Code 2: open isolation solenoid or EBCM malfunction
 
Code 3: open dump solenoid or EBCM malfunction
 
Code 4: grounded anti-lock pressure valve rest switch
 
Code 5: excessive dump valve actuations during anti-lock stop
 
Code 6: erratic speed signal
 
Code 7: shorted isolation solenoid or EBCM malfunction
 
Code 8: shorted dump solenoid or EBCM malfunction
 
Code 9: open or grounded speed signal circuit
 
Code 10: stop lamp switch circuit
 
Codes 1, 11 and 12: invalid diagnostic trouble codes
 
Codes 13, 14 and 15: electric brake control module malfunction
 

 
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