GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

Trouble Codes

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The following is a list of trouble codes on 1994-96 models equipped with EBCM, VCM or 4WAL ABS systems



Code 21: Right front wheel speed sensor or circuit open
 
Code 22: Missing right front speed signal
 
Code 23: Erratic right front wheel speed sensor
 
Code 25: Left front wheel speed sensor or circuit open
 
Code 26: Missing left front speed signal
 
Code 27: Erratic left front wheel speed sensor
 
Code 29: Simultaneous drop-out of front wheel speed sensors
 
Code 35: Open or grounded rear speed signal circuit-EBCM models only
 
Code 36: Missing rear speed signal
 
Code 37: Erratic rear speed signal
 
Code 38: Wheel speed error
 
Codes 41-54: Control valves-EBCM models only
 
Code 41: Right front isolation solenoid or circuit open-VCM or 4WAL models only
 
Code 42: Right front pulse-width modulated solenoid or circuit open-VCM or 4WAL models only
 
Code 43: Right front isolation solenoid or circuit open-VCM or 4WAL models only
 
Code 44: Right front pulse-width modulated solenoid or circuit shorted-VCM or 4WAL models only
 
Code 45: Left front isolation solenoid or circuit open-VCM or 4WAL models only
 
Code 46: Left front pulse-width modulated solenoid or circuit open-VCM or 4WAL models only
 
Code 47: Left front isolation solenoid or circuit shorted-VCM or 4WAL models only
 
Code 48: Left front pulse-width modulated solenoid or circuit shorted-VCM or 4WAL models only
 
Code 51: Rear isolation solenoid or circuit open-VCM or 4WAL models only
 
Code 52: Rear pulse-width modulated solenoid or circuit open-VCM or 4WAL models only
 
Code 53: Rear isolation solenoid or circuit shorted-VCM or 4WAL models only
 
Code 54: Rear pulse-width modulated solenoid or circuit shorted-VCM or 4WAL models only
 
Code 64: VCM/4WAL system voltage low-VCM or 4WAL models only
 
Codes 65-66: Open or shorted pump motor relay-EBCM models only
 
Code 65: Pump motor relay or circuit open-VCM or 4WAL models only
 
Code 66: Pump motor relay or circuit shorted-VCM or 4WAL models only
 
Code 67: Open motor circuit or shorted BPMV output-EBCM models only
 
Code 67: Open motor circuit or shorted VCM output-VCM or 4WAL models only
 
Code 68: Locked motor or shorted motor circuit-EBCM models only
 
Codes 71-74: memory errors-EBCM models only
 
Code 74: Excessive isolation time-VCM or 4WAL models only
 
Code 81: Brake switch circuit shorted or open
 
Code 86: Shorted anti-lock indicator lamp
 
Code 88: Shorted brake warning lamp-EBCM models only
 

The following is a list of trouble codes on 1997-99 models equipped with 4WAL ABS systems



Code C0021: Right front wheel speed sensor circuit open or shorted to battery
 
Code C0022: Missing right front speed signal
 
Code C0023: Erratic right front wheel speed sensor
 
Code C0025: Left front wheel speed sensor circuit open or shorted to battery
 
Code C0026: Missing left front speed signal
 
Code C0027: Erratic left front wheel speed sensor
 
Code C0029: Simultaneous drop-out of front wheel speed sensors
 
Code C0035: Open or grounded rear speed signal circuit
 
Code C0036: Missing rear speed signal
 
Code C0037: Erratic rear speed signal
 
Code C0038: Wheel speed signal malfunction
 
Codes C0041: Right front isolation solenoid or circuit open
 
Code C0042: Right front dump solenoid circuit open
 
Code C0043: Right front isolation solenoid circuit shorted
 
Code C0044: Right front dump solenoid circuit shorted
 
Code C0045: Left front isolation solenoid circuit open
 
Code C0046: Left front dump solenoid circuit open
 
Code C0047: Left front isolation solenoid circuit shorted
 
Code C0048: Left front dump solenoid circuit shorted
 
Code C0051: Rear isolation solenoid circuit open
 
Code C0052: Rear dump solenoid circuit open
 
Code C0053: Rear isolation solenoid circuit shorted
 
Code C0054: Rear dump solenoid circuit shorted
 
Codes C0065: Pump motor relay circuit open
 
Code C0066: Pump motor relay circuit shorted
 
Code C0067: Open pump motor circuit
 
Code C0068: Locked pump motor or shorted pump motor circuit
 
Codes C0071-74: EBCM internal fault
 
Code C0081: Stoplamp switch always closed or open
 
Code C0086: Anti-lock indicator lamp circuit shorted to battery
 
Code C0088: Brake warning lamp circuit shorted to battery
 

 
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