Q: Brake ABS CEL on/off . ABS pulses once during braking, electrical system goes weak, wiper and lights weak.

asked by on July 05, 2016

When the truck starts, CEL for ABS and Brake light fluctuate on/off. Driving and when I brake, the ABS pulses once , can feel it in my foot. Headlights go dim, wipers run like they don't have much juice. At times, I have turned engine off with key out but engine continues running, put key back in, turn it on, wait for ABS/Brake CEL to go off then I can stop the engine.

My car has 141000 miles.
My car has an automatic transmission.

Warning Light is on Inspection $79.99 - $89.99 Get a Quote

I don’t know if all this started happening simultaneously or if these issues have been slowly accumulating, but here is how I would proceed: begin with a battery test and clean and make sure to tighten the cable connections. Replace the battery if needed before continuing.

Next, test the alternator output and be sure to check for A/C voltage ripple from the alternator. Belt must be good and at the correct tension. There have been faulty brake fluid level switches found. There have been issues with both the instrument cluster and ABS system on these trucks. They must communicate with each other, and can be tested with a scan tool to gather any existing diagnostic trouble codes (DTCs) to assist with diagnosis. Check for codes and module communication on the network.

If you want to have this done, a technician from YourMechanic can come and diagnose the warning lights and any of the other symptoms your car is exhibiting so that correct repairs can be made.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Van jerks, engine loses power, no acceleration - 2008 Hyundai Entourage

Hey there. A good start would be to have the car scanned to see what code has set in the computer and turn the Check Engine Light on. Your problem could be many things, from a problem with the drive-by-wire...

Car stalls after fueling

It sounds like you may have a problem with your evaporative emissions system. Your car has a small purge valve called a purge solenoid that controls the venting of fumes from the fuel tank as these fumes build up inside,...

When I'm driving and come to a stop, the rpm gauge goes up while I'm braking causing the car to jerk sometimes.

Hello. This is a common sign of a failing throttle position sensor. The throttle position sensor (TPS) is a sensor used to monitor the throttle position of a vehicle. The sensor is usually located on the butterfly spindle/shaft so that...

Truck will not start, but lights still work - 1979 Ford F-100

Considering the loud clicking, have the battery tested and charged just to be sure. A loud clicking from the engine bay is a symptom of a failed or weak starter, low charge on the battery or a grounding problem in...

Engine clicking and shaking

Hello. The symptoms you describe can be caused by a few different things. A few possibilities are an exhaust leak, or some sort of engine performance issue, such as a misfire. If the noise appears to be coming from the...

I am having issues with the defroster blowing cold air on the driver side

Hi there. There is a blend door issue on your ducting to your heating and air conditioning system. Check all of the blend doors and make sure that they are working. The blend door that is not working properly can...

P0446 Emission control system vent circuit malfunction

Hello! We will be happy to assist you. It may be the gas cap because one way the EVAP system tests itself is by monitoring the pressure inside to fuel tank and comparing it to atmospheric conditions. If the pressure...

The door ajar light won't turn off

Hello. On most vehicles, this is caused by the door switch in the latch assembly failing, or by the wiring from the door jamb wearing and breaking from years of use. All of the door panels will need to be...

Vibration and sound along with clicking once wheels are turned when off the ground

Hello thank you for writing in. There are several components that you will want to have looked at. Regarding the wheel bearing, they do cause similar symptoms, and if you hit hard enough, you will want to have them inspected....

Related articles

P0873 OBD-II Trouble Code: Transmission Fluid Pressure Sensor/Switch C Circuit High
P0873 means the transmission fluid pressure level is abnormal due to Dirty, contaminated or burnt transmission fluid, or a faulty transmission system.
P2323 OBD-II Trouble Code: Ignition Coil H Secondary Circuit
P2323 P2323 code definition Ignition Coil H Secondary Circuit What the P2323 code means This trouble code indicates that the powertrain control module has detected a malfunction in the primary or secondary circuit in one or more of the ignition...
P0192 OBD-II Trouble Code: Fuel Rail Pressure Sensor Circuit Low Input
P0192 trouble code definition Fuel rail pressure sensor circuit low input What the P0192 code means The power control module (PCM) has...