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

asked by on

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.

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.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Brake ABS CEL on/off . ABS pulses once during braking, electrical system goes weak, wiper and lights weak.

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

Get a quote

What others are asking

Q: Brights and fog lights stopped working.

The fog lights would only work with the low beams. The high beams would be on with the indicator. The system may have a defective light switch causing the issue if you cannot switch to low beams by pulling the...

Q: Q: What else should I do?

The fuel injectors on this engine can intermittent stick causing a misfire. The fix is to replace the injector for the cylinder having the problem. This is from a carbon build up in the injector pintle. I would recommend having...

Q: Saturn Vue 2006 exhaust leak in manifold

Hi there. An exhaust leak can be very tricky - depending on the location of the actual leak. If it is leaking near the exhaust manifold or the cylinder head, the potential for internal engine damage increases. In regards to...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...