Q: Service suspension system is on

asked by on

Yes hi service suspension system light have been on in my car and I have no idea what to do. When I start braking after going like 50mph or higher my car would start shaking. But only when I'm braking it shakes bad. I had new brakes and rotors put on. Plus outter tire rod end. Just everything don't know body seem to know why this warning light on or why my car is shaking so bad. So can u help??

2006 Buick Lucerne v8 North Star engine My car has 130000 miles.
My car has an automatic transmission.

If the suspension warning light is illuminated that means that trouble codes have been stored. Those codes should be downloaded by a mechanic and evaluated to determine the cause of the fault. Once the fault is pinpointed, necessary repairs are made and that could involve anything from fixing a loose wire to replacing a bad sensor. In all events, the issue is definitely resolvable if you request a suspension warning light diagnostic.


With regard to the vibration on braking, such vibration is typically due to excessive thickness variation in the brake rotor, brake pad defects, or excessive rotor runout as installed on the wheel hub. Suspension faults are possible, too. If the brake rotors that were installed on your car are new and are OEM (dealer supplied), thickness variation in the rotor is not generally an issue but you still could have vibration due to excessive run-out as the rotor sits on the wheel hub. As installed on the wheel hub, rotor run-out should be measured by the mechanic using a specialized dial indicator and verified to be LESS than .002 inches. If installed rotor run-out exceeds .002 inches, the run-out MUST be corrected by shimming or re-indexing the rotor to the hub. To have the root cause of the brake vibration identified, please request a brake and suspension system diagnostic. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Service suspension system is on

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: Receiving a service stabilitrak/brake system/ traction control simultaneously....started about 2 weeks ago.

Hi there: You would be correct to assume that these warning lights are related. In fact, in most cases, if the right sensor is bad or the electrical connection to the sensor is faulty, it can trigger all three lights....

Q: Q: Car burning oil

Hi there, thanks for writing in about your 2006 BMW 750Li. The two causes of an engine to burn oil are faulty piston rings and faulty valve guides or seals. If the piston rings are faulty, this will allow oil...

Q: 4T65E just replaced 08 Lucerne 3.8L, replaced plugs/wires/1 coil pack melted at #4 so replaced it now rough idle

The coil pack melts down for a reason and cause will need to be diagnosed what caused it. The most common cause is a short in the signal wire or excessive resistance in the plug wires or plugs. I recommend...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.