# 1999 Mazda B4000 jumpy speedo

**URL:** <https://community.cartalk.com/t/1999-mazda-b4000-jumpy-speedo/164521>\
**Category:** Maintenance/Repairs\
**Tags:** mazda\
**Created:** [May 18, 2020, 7:36pm UTC](https://community.cartalk.com/t/1999-mazda-b4000-jumpy-speedo/164521 "2020-05-18T19:36:42Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![CYBERFLYER](https://avatars.discourse-cdn.com/v4/letter/c/4af34b/32.png) [@CYBERFLYER](https://community.cartalk.com/u/CYBERFLYER)\
**Post date:** [May 18, 2020, 7:36pm UTC](https://community.cartalk.com/t/1999-mazda-b4000-jumpy-speedo/164521/1 "2020-05-18T19:36:42Z")

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Speedometer indicator jumps uo and down when wipers are turned on

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [May 18, 2020, 10:26pm UTC](https://community.cartalk.com/t/1999-mazda-b4000-jumpy-speedo/164521/2 "2020-05-18T22:26:28Z")

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Sounds like a failing body control module to me.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [May 18, 2020, 10:44pm UTC](https://community.cartalk.com/t/1999-mazda-b4000-jumpy-speedo/164521/3 "2020-05-18T22:44:50Z")

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Maybe corroded grounds.