Skip the auto shop - Our mechanics make house calls

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?

Need advice from certified mechanic? Get help now!

Over 1000 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

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: 3.7 engine temperature gauge runs between middle to 3/4, leans a little more to 3 /4 never over is this normal

Hi there, thanks for writing in about your 2007 Hummer H3. The temperature should typically rest more towards the middle of the gauge. You should have the vehicle tested to see if the engine is running hot, or if it...

Q: Having weird transmission issues need advise on to sell or fix.

The transmission will likely need to be rebuilt or replaced. I would get a quote from a few local shops for a transmission overhaul and then compare this with the car's value before and after repairs. Look at some other...

Q: My car is overheating when the air conditioning is on - 2007 Hummer H3

Hello. Running the A/C will put extra strain on the engine and cause it to heat up quicker. If your vehicle is overheating, you should keep it below 280 degrees at all cost. This is the temperature when extreme irreversible...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.