Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1995SUBURBAN K2500, 6.5 FREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXANTI-LOCK BRAKE SYSTEM DTCS
1995 GMC Suburban K2500, 6.5 F
Anti-Lock Brake System DTCS
1995 GMC Suburban K2500, 6.5 FSECTION Anti-Lock Brake System DTCS
ANTI-LOCK BRAKE SYSTEM DTCS
| OEM Code | Description |
|---|---|
| 21 | Right Front Speed Sensor Or Circuit Open |
| 22 | Missing Right Front Speed Signal |
| 23 | Erratic Right Front Speed Sensor |
| 25 | Left Front Speed Sensor Or Circuit Open |
| 26 | Missing Left Front Speed Signal |
| 27 | Erratic Left Front Speed Sensor |
| 29 | Simultaneous Drop-Out Of Front Speed Sensors |
| 35 | Open Or Grounded Rear Speed Signal Circuit |
| 36 | Missing Rear Speed Signal |
| 37 | Erratic Rear Speed Signal |
| 38 | Wheel Speed Error |
| 41 | Control Valves |
| 42 | Control Valves |
| 43 | Control Valves |
| 44 | Control Valves |
| 45 | Control Valves |
| 46 | Control Valves |
| 47 | Control Valves |
| 48 | Control Valves |
| 49 | Control Valves |
| 50 | Control Valves |
| 51 | Control Valves |
| 52 | Control Valves |
| 53 | Control Valves |
| 54 | Control Valves |
| 65 | Open Or Shorted Pump Motor Relay |
| 66 | Open Or Shorted Pump Motor Relay |
| 67 | Open Motor Circuit Or Shorted BPMV Output |
| 68 | Locked Motor Or Shorted Motor Circuit |
| 71 | Memory Errors |
| 72 | Memory Errors |
| 73 | Memory Errors |
| 74 | Memory Errors |
| 81 | Brake Switch Circuit Shorted Or Open |
| 86 | Shorted Anti-Lock Indicator Light |
| 88 | Shorted Brake Warning Light |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.