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Home >> GMC >> 1996 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - 6.5L Diesel >> Testing >> Speedometer & Odometer Test >> Speedometer/Odometer Does Not Operate

Speedometer/Odometer Does Not Operate

  1. Disconnect IPC connector. Disconnect vehicle speed sensor buffer connector. Connect a self-powered test light between IPC connector terminal No. 14 (Dark Green wire) and ground. If test light does not come on, go to next step. If test light comes on, repair short to ground in Dark Green wire.
  2. Connect self-powered test light between IPC connector terminal No. 14 (Dark Green wire) and vehicle speed sensor buffer connector terminal No. 15 or vehicle control module connector C4 terminal No. 4 (Dark Green wire). If test light comes on, replace IPC. If test light does not come on, repair open circuit in Dark Green wire.
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