Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
At the parking brake switch. OHM test the white/black wire to ground. With the parking brake not applied this wire should not be grounded. If it is grounded then the parking brake is partially applied, the switch is bad or this wire is chaffed and touching ground somewhere behind the dash.
The speedometer VSS signal comes from the ABS and goes to the ECM and then to the instrument cluster. A scan tool is needed to see if either of those modules show the same 25 mph speed signal delay. If not and they read accurate then the instrument cluster is faulty.
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Thanks for using Just Answer, Chris
Hello again Chris here,