Why does the ABS, Brake and Check Engine light all stay on and the Speedometer doesn't register till 25 mph.

Asked by May 22, 2013 at 01:16 PM about the Dodge Ram 1500

Question type: Maintenance & Repair

This is a 1999 Dodge Ram 1500 SLT, 5.9 engine. The ABS, Brake and Check Engine
light all stay on and the speedometer doesn't register till you get around 25mph and also
drops out when approaching a stop. All was fine until I shifted from 2 wheel to 4 wheel
and also fueled up. The check engine code was P0138, O2 sensor down stream. Any
suggestions?

4 Answers

Could be an unreliable ground...trace the black battery cable to where it attaches to the chassis/frame disconnect and wirebrush the lug and chassis clean and re-attach it...this action will reset the codes...with any luck~

1 of 1 people found this helpful.

you changed the defecive 02 sensor down the exhaust pipe...yes~ you should be okay then~

hate to suggest this, just try a "global reset" if it fails pick up another ECM---your speedo troubles and dash complications should vanish...if the reset ain't doin' it~

1 of 1 people found this helpful.

After replacing the battery because of age, I am seeing this same condition. I will check ground wires and reset. Any other suggestions?

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