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 MANUALSCHEVROLET1999CORVETTE 2D COUPE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKE SYSTEM WITH TRACTION CONTROL SYSTEMDIAGNOSTIC TESTSDTC C1225: LEFT FRONT WHEEL EXCESSIVE SPEED VARIATIONDIAGNOSIS
1999 Chevrolet Corvette 2D Coupe, Standard
DTC C1225: Left Front Wheel Excessive Speed Variation: Diagnosis
1999 Chevrolet Corvette 2D Coupe, StandardSECTION Diagnosis
- Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK. After performing diagnostic system check, go to next step.
- Inspect left front WSS wiring and connectors for damage. Inspect sensor ring for looseness or damage. If any damage is present, go to step 7) . If no damage is present, go to next step.
- Disconnect harness connector from left front WSS. Check resistance between sensor terminals "A" and "B". If resistance is 850-1350 ohms, go to next step. If not, go to step 8) .
- Using DVOM on AC scale and still connected to sensor, spin wheel by hand while monitoring voltage reading. If voltage reading is 100 millivolts or greater, go to next step. If not, go to step 8) .
- Disconnect EBTCM harness connector. Install pinout box and adapter cable to EBTCM harness connector. Check resistance between pinout box pins No. 15 and 31. If resistance is infinite, go to next step. If not, go to step 9) .
- Check for short in circuits No. 830 and 873 to EBTCM harness connector. Repair as necessary. Reconnect all harness connectors. Test drive vehicle at speed greater than 15 MPH for at least 30 seconds. Check if DTC resets. If DTC resets, go to step 10) . If DTC does not reset, go to step 11) .
- Replace sensor components as needed. Test drive vehicle at speed greater than 15 MPH for at least 30 seconds. Check if DTC resets. If DTC resets, repeat step 3) .
- Replace left front WSS.
- Repair short between circuits No. 830 and 873.
- Replace EBTCM.
- Malfunction is intermittent. See DIAGNOSTIC AIDS .
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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.