Q: What causes code Code 00543 and how to fix?

asked by on

When first start the car. All is ok, then about a minute later,the transmission gear display lights up. When sifting from reverse to drive, the transmission shifts hard. and the car had low power taking off. After a few minutes, I turn engine off and restar t it and the problem goes away.

My car has 167000 miles.
My car has an automatic transmission.

Hello. The code 00543 stands for "Engine speed to max exceeded". Meaning the computer has detected the engine has crossed over 7200RPMs due to an operating fault. Since you were simply starting the vehicle and backing it up, it is assumed the engine was not in fact ever revving up that high. The engine’s damage prevention system that is activating is likely having some faults. The rev. limiter may be causing issues or be disconnected. Transmission to engine communication may be poor. The throttle can also be having issues. The ECM is responsible for a lot of these calculations and it could be failing. These issues are typically complicated and should probably be inspected by a professional.

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. What causes code Code 00543 and how to fix?

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: loss of pressure on acceleration and internal oil leak via burning oil

Hi there. Typically when your car is consuming this amount of oil at an incredible rate, it's caused by an internal engine fault, such as damaged cylinder head valve guides or piston rings.Although our mobile mechanics can often complete routine...

Q: My Audi revs but will not drive in reverse. The ABS light is on and the brake light flashes on the dash. What could be the cause?

The transmission needs around 100 psi pressure to operate all of the forward gears, but it needs 180-190 psi pressure for the reverse gears. The transmission pump is designed to create 1000 psi of pressure and it is regulated...

Q: Car will not engage in drive

Claimed by John Hege

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.