Possible Cause

NOTE:  The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

• Countershaft speed sensor failure
• Countershaft speed sensor NC line open (includes a loose or disconnected connector)
• Countershaft speed sensor VCC3 line open (includes a loose or disconnected connector)
• Countershaft speed sensor SG3 line open (includes a loose or disconnected connector)
• Countershaft speed sensor NC line short to ground
• TCM internal circuit failure