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Troubleshooting Code: 3C! Type: Speed Sensor Code Description Code 3C! indicates a faulty speed sensor signal which can be set by one of two conditions: • A wiring or sensor connection may cause a 3C! fault after approximately 15 seconds. Likely causes are wiring problems or bad connections. • A mis-adjusted or faulty sensor may cause a 3C! fault after 15 to 20 ignition key cycles without any speed signal. Note: This fault may occur if ignition has been cycled 15 to 20 times without moving the vehicle. See “Troubleshooting Tips” on page 20 for general guidelines on system diagnostics. 24