Dwight Lindsey Posted June 6, 2022 Share Posted June 6, 2022 We did a weekend trip to Santa Barbara and the beach and for the first time I had issues with the speedometer. On the way West to the beach the speedometer was occasionally reading the correct speed, but more often was flailing violently between 0 and 55mph. Silverleaf VMS PC MPG looked pretty normal. On the way back from the beach today the speedometer was even more wacky, never stabilizing and Silverleaf MPG was 0 most of the way home. Halfway back I got a check engine light. The diagnostic code from the Silverleaf is: ENG PID 84 2 Road Speed Invalid Data 6/6/22 11:29 Where to look? Wheel sensor? If so, where is it? ECM? Ground? if so, where? I'm not thinking it's the speedometer itself, since both the speedometer and ECM are affected. I'll appreciate any advice about where to look. Dwight 05 Knight (Very similar to an 04 Diplomat) Link to comment Share on other sites More sharing options...
Ivan K Posted June 6, 2022 Share Posted June 6, 2022 Speed Sensor at the tail of Allison tranny. Could be just a connection so check it first. 2 Link to comment Share on other sites More sharing options...
Dwight Lindsey Posted June 18, 2023 Author Share Posted June 18, 2023 Ivan, I just realized that I never replied to you and thanked you for your very helpful email. I bought a new speed sensor, but before it arrived I cleaned the existing one and it's been fine since. I now have a spare . . . Thanks so much Dwight Link to comment Share on other sites More sharing options...
Ivan K Posted June 18, 2023 Share Posted June 18, 2023 11 hours ago, Dwight Lindsey said: Ivan, I just realized that I never replied to you and thanked you for your very helpful email. I bought a new speed sensor, but before it arrived I cleaned the existing one and it's been fine since. I now have a spare . . . Thanks so much Dwight Dwight, glad it turned out to be easy and cheap! Link to comment Share on other sites More sharing options...
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