Paccar KENWORTH T2000 - C2. Symptom: Retarder works only when button held down or does not turn on.; C2-1. Possible cause: No ignition power to electronics module.; C3-2. Possible cause: Bad electronics module or steering wheel hub.

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MAINTENANCE MANUAL
Kenworth T2000 SmartWheel Troubleshooting Guide
16
Figure 16-9
Central Electrical Panel
MPX IGN