Diagnostic Procedure

Vehicle position icon constantly leaves road, moves erratically, or is displayed very far from actual vehicle position

Symptom Troubleshooting Vehicle Position Icon Constantly Leaves Road, Moves Erratically, or Is Displayed Very Far From Actual Vehicle Position

Also check for

Navigation unit

Also check for

GPS antenna/cable

Also check for

PCM (speed and fuel pulse)

Also check for

Harness/fuses/switches

Also check for

Aftermarket accessories mounted near or above the GPS antenna