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

asked by on June 03, 2017

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.

Check Engine Light is on Inspection $79.99 - $99.99 Get a Quote

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.

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


Experienced Mechanic?

Earn up to $65/hr

What others are asking

Losing coolant air conditioner and heat not turning on at all

Hey there, thanks for writing in about your 2003 Chrysler Sebring. The problem is that you are low on coolant and the A/C needs to be diagnosed to see why it is not working. If you have a coolant leak,...

Knocking noise and tough turns.

The knocking noise could be a result of many possible things such as failing steering components or potentially engine noises. Unfortunately, in order to properly diagnose, it will require a professional mechanic taking a look at the car and taking...

Can a rear impact accident cause problems with the VSA? SYSTEM MALFUNCTIONED AFTER THE ACCIDENT

Hello, thank you for writing in. The VSA or Vehicle Stability Assist system is designed to work with the ABS system to keep control of the vehicle at all times in all conditions. It uses several of the same sensors...

Transmission cooling hose keeps blowing off of radiator

The retainer clip needs to be replaced. It is not able to secure the line under high temperature and pressures. Get the part from the dealer and have the line checked for any problems, and replace as needed. If the...

Service engine light flashes when accelerating and driving rough

This is a common sign of a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Loud constant noise from engine approximately 30 secs after start - check engine light on - code P1404

Faulty EGR valve

New tension belt was put on and the car will not start. The car computer is saying the timing belt is off.

Hi there. The serpentine or drive belts have nothing to do with the timing belt on the car. It depends on the tensioner that was installed, either the drive belt tensioner or the timing belt tensioner. I recommend seeking out...

Can putting a EverStart Marine Battery, Group 24MS - 1000 CA in my van damage it? If so, how?

The battery you installed is a 12 volt battery and although the cranking amps rating of the battery you have applies to a higher temperature (marine environments are typically relatively warm environments) at 1,000 MCA (marine cranking amps), that is...

The radiator cooling fan does not blow hard enough to cool off the engine

Hi, thanks for writing in. You will need to have the cooling fan actuated using a scanner with the capability to operate the different fan speeds. The system has a low and a high speed relay in the totally integrated...

Related articles

How to Get Chrysler Dealership Certified
Chrysler car dealerships offer automotive technician jobs to mechanics who are certified through the MOPAR CAP (Career Automotive Program).
2012 Chrysler 200 vs. 2012 Chevrolet Malibu: Which One Should I Buy?
When you are looking for a small-range sedan, you need to get somewhere quickly and inexpensively, and may even need to take a few kids with you. Slightly larger than a commuter car, these mid-size options offer decent gas mileage,...
The Best Used Cars to Buy If You're a Rock Climber
If If you’re a rock climber, you want a vehicle that gets you where you need to go, even if the terrain gets rough. You may be living out of your vehicle at times, so you also want a rig...