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Check to see if your emergency brake is partially on. Also the abs light goes on when the sensors on the hubs get corroded from salt. They either need to be cleaned or replaced. Mine are on from corrosion from road salt so rather than pay the hefty fee to fix the issue until I can do it myself I just pulled the fuse for ABS in my panel to shut that system off. Perfectly safe to drive without them and not an inspection requirement. Now your abs is probably going on every time you apply the brakes and that is not a good thing!
i wonder if you mean abs light i f so loosen and re tighten .often no contact makes the abs light come on .other wise release emergency brake perhaps the peddle got pushes a couple of clicks enough to make light come on but not enough to look like it is applied.try emergency brake first push then release with handle.you wouldnt beleive how many people this happenes to .
Take it to Autozone, Advance, or Oreilys for a FREE scan. Since a problem light is on, the computer will tell you what part is bad.
The ABS can have a problem reading the RPM of each wheel if there is dirt or debris blocking a sensor. Common problems are the rear Emergency brake shoes coming apart within the drum portion of the rear rotor. The rear of the truck has 2 braking systems, an Emergency brake and a service brake.
The ABS portion of your problem can also be scanned with a better scanner having more functions. The "Check engine" light is on a separate system and most minimum priced scanners will work with it. Since the ABS is automatically operating, a malfunction can result in a jolt as the individual brakes are wrongly applied.
The ABS will apply the brakes to the fastest spinning wheel and this will result in a drivetrain jolt.
the traction control system works off of the abs system so there is a code in the abs module that needs to be pulled so you know were to start to check the system out.the service engine light is a different system all together and there is a code in the ecm that must be pulled so you know were to start to check to repair that system.you don`t say why you jumped to the conclusion that the gas cap set a code.the emergency brake light will come on if the e-brake is not all the way in the off position(something may be holding the lever up just enough to put the light on.the switch could be misadjusted and needs to e readjusted.
ABS what a pain if tires are not set to right pressure they come on if the sensors are even slightly dirty they come on if theres brake ware they come on if brakes are applied to hard they tend to come on and when you work around them they come on and sometimes there codes have to be reset with one of those tech devices i feel your pain
There is a shift interlock mechanism that only alows the key to come out in park. It is the same mechanism that will not let you put it into gear unless you put your foot on the brake. You cannot safely bypass it.