Rough Running Idle, ABS Light Illuminated, and Check Engine Light on Mazda B2500

Submitted by Vehicle Owner · May 29, 2025
Published by RepairPal

Problem overview

Water intrusion into a connector (X309) located under the cab, beneath the driver's seat, can cause a rough idle, erratic speedometer operation, ABS light and check engine light illumination, and automatic transmission shifting problems. If needed, connector repair parts are available from Mazda dealers, and possibly some Ford dealers.

15 people reported this problem
7 comments
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Mazda B2500 vehicles with this problem

Average mileage: 111,333 miles
(43,000 - 166,000)

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