Q: P0733, P0734, P792, P490, P1790 after mechanic rebuilt engine

asked by on

I just had engine rebuilt and got car back. Check engine light came in after 24 to 48 hours. P0733, P0734, P792, P490, P1790 after mechanic rebuilt engine

My car has 170000 miles.
My car has an automatic transmission.

I think these codes may be explained by an electrical harness connector that is unplugged. The first two codes refer to the transmission ratios and the P0792 is for a speed sensor. The lack of a speed sensor signal could be causing the 733 and the 734 codes. code 490 is for high voltage at an EGR sensor which could happen if the circuit is not completed and 1790 is a Chrysler specific code for the transmission control system. So while it looks bad, it may be that all of these codes could be solved by correcting a single electrical connection. Take the car back to the Mechanic and ask him to look it over and see if there is something amiss. Removing and installing an engine involves dozens of electrical connections and it’s very easy to overlook something. If you need another opinion, you can contact Your Mechanic to have a technician come out to your home or office to check out your Chrysler and make a recommendation.

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. P0733, P0734, P792, P490, P1790 after mechanic rebuilt engine

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: AC compressor clicking

Hi, it is possible that the compressor needs replacing, however, it can make a clicking noise if the system is low on refrigerant. You should never have to add refrigerant to the A/C system, so it sounds like there is...

Q: My 08 scion xb vibrates at 55 mph

You did not specify the transmission you have but the problem sounds like an issue with the constant velocity inner joint. When these joints start to have problems with vibration they are known to exhibit problems under a load and...

Q: New power steering pump and hoses. The fluid is good too but it's hard to turn the steering wheel. What causes it?

Hello, thanks for writing in. Assuming the power steering system has been properly bled, and there is no more air in the system, I suspect the pressure relief valve in the pump itself is stuck, not allowing pressure to "assist"...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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.