Q: Q: My car is on Limp mode.

asked by on

My car is on Limp mode and is showing the following codes: P1121 and P1124. I replaced the throttle body and the circuit board for the relay.

Hi. Most of the time when these codes come up it is because the throttle body has failed. If you replaced the throttle body and cleared the codes and the problem persists then there may be another issue. When replacing the throttle body you also should check and replace the connection. It is common for the terminals to have connection issues. I would also check the voltage at the throttle body to ensure that it does not have a circuit issue. If these are not tests that you are comfortable with then you should enlist the assistance of a certified mechanic that has the tools to do this, like one from YourMechanic.

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. Q: My car is on 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: high idle on startup, 2002 Chevrolet Avalanche

Hey there, it looks like you already did a fair amount of work on this. Another thing that you should take a look at is the throttle body. You may have to clean out the throttle body and get the...

Q: How to fix loud lifter noise?

Add 1 quart of ATF to the engine oil and run the engine for 15 minutes at 2,000 rpm’s. This will thin out the engine oil and clean out the lifter with the high detergents. Then drain the oil and...

Q: My car is overheating and I would like to pinpoint the cause.

Great description of the problem - your observations helped eliminate the issues it could possibly have. From what you've described, you may have a clogged heater core. Fix and flush your system. While flushing the system, make sure you look...

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...
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...
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...