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.
Automatic Tests
Turn ignition on. Using Tech 1, select F4: MISC TESTS and then F1: AUTO TEST. Press ENTER when ready. Valves can be heard and felt cycling from hydraulic control unit. Have assistant verify pump motor is turned on. See DIAGNOSTIC TROUBLE CODE (DTC) table if DTCs are set. See DIAGNOSTIC TROUBLE CODE CHARTS. After all diagnosis and repairs are completed, clear DTCs and verify operation. AUTO test is performed automatically by EBCM once during each ignition cycle when vehicle reaches approximately 4 MPH.
| DTC | (1)Definition | ||
|---|---|---|---|
| 12 | Diagnostic System Operational | ||
| 21 | Right Front Wheel Speed Sensor Circuit | ||
| 23 | Right Front Wheel Speed Sensor Continuity | ||
| 25 | Left Front Wheel Speed Sensor Circuit | ||
| 27 | Left Front Wheel Speed Sensor Continuity | ||
| 28 | Wheel Speed Sensor Frequency Error | ||
| 35 | Rear Axle (Wheel) Speed Sensor Circuit | ||
| 37 | Rear Axle (Wheel) Speed Sensor Continuity | ||
| 41 | Right Front Inlet Solenoid Valve Fault | ||
| 42 | Right Front Outlet Solenoid Valve Fault | ||
| 45 | Left Front Inlet Solenoid Valve Fault | ||
| 46 | Left Front Outlet Solenoid Valve Fault | ||
| 55 | Rear Inlet Solenoid Valve Fault | ||
| 56 | Rear Outlet Solenoid Valve Fault | ||
| 61 | Pump Motor Or Relay Fault | ||
| 63 | Solenoid Valve Relay Fault | ||
| 71 | EBCM Fault | ||
| 85 | Low Voltage | ||
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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.
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