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WHAT CAUSES O/D LIGHT TO FLASH & ROUGH START & SPEEDOMETER TO ACT ERRATIC

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Run fault codes and look for a problem TCM unit or wiring problem.

Posted on Jun 20, 2014

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SOURCE: 2000 Jeep Grand Cherokee In'line 6 cyl.....Erratic guages... check guages light goes on, guages go off for 10 seconds, then back on. Speedometer jumps. Idiot lights sometimes come on for a few second

This will be challenging to find ... If headlights dim or flicker too ... check battery terminals first. But I think it will be a large harness with quite a few wires on it ... Check ... for loose bulkhead connectors at the firewall ... and between the Engine and the body/firewall .... at the ECU .... you may also check for loose harness connectors at the fuse box. check for loose or corroded fuses ... especially if a cover is missing.
If I remember correctly this truck has 3 fuse panels in it. Check the manual

Posted on May 12, 2009

  • 56 Answers

SOURCE: Vehicle had a rough automatic transmission shift

Still sounds like a bad output speed sensor - check scan the TCM for codes and see what you get. Also check the wiring at and near the output speed sensor connector.

Posted on Jul 22, 2009

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