Q: Car suddenly went into limp mode

asked by on

After some off-roading last friday, the car suddenly went into in limp mode, doesn't go faster than 40Km/h with the pedal to the metal and makes awful sounds. I don't know if it's related but have recently changed brake pads and brake sensor switch, transmission oil

My car has 157000 miles.
My car has an automatic transmission.

Hello and thank you for contacting Your Mechanic. Your Hummer could have the brake system engaged for the traction control. Disable the traction control and see if the engine will increase in speed.

Another thing to check is the parking brake cable. See if the cable is snagged on anything causing the vehicle to have a dragging resistance in the brakes. If the brakes are free and working correctly and if the engine continues to be in limp mode, then there could be an issue with the transmission.

Check all of the harness connections to all of the sensors on the transmission and transfer case. If all of the connections are tight, then I recommend having a professional, such as one from YourMechanic, drive your Hummer and determine why your car isn’t getting enough power and is making unusual noises.

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. Car suddenly went into limp mode

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: Q: Engine sludge?

If you have excessive sludge in the engine, then the oil that you pour into the engine may not be able to drain down into the oil pan. You should change the oil and filter using 6 quarts of 0w30...

Q: Car won't go in reverse and died.

Your transmission is electronically controlled, a very likely cause that would prevent the transmission from shifting into reverse and then prevent the vehicle from starting is the transmission range switch. My recommendation is to have a mechanic, such as one...

Q: Is it true that if a timing chain is bad it means the engine needs to be rebuilt or replaced?

This is largely dependent upon whether or not the motor is what is considered to be an "interference motor" or not, meaning that the timing belt or chain being stopped or damaged will cause a drastic stop or damage to...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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...