Skip the auto shop - Our mechanics make house calls

Q: Step by step troubleshooting of DTC fault codes

asked by on

2005 Hyundai Elantra with the 2.0l engine swapped with a 1.8l engine. Several visits to mechanics have failed to resolve the following issues: 1. The transmission tends to downshift with a jerk. 2. During acceleration, the car usually loses power, hesitating for a while before picking up. 3. When going up an incline with the vehicle slowing as a result, the transmission takes forever to downshift accordingly, thus necessitating me to floor the accelerator to force a response and keep the car in motion. 4. Fuel consumption is extremely high with the vehicle burning a tank of gas over a 200km distance. 5. Engine temperature is between 84 and 87 degrees Celsius when idling and higher when running. Even tho it doesn't overheat, it seems to be pretty high and mostly at mid-gauge. After a long run, a ticking sound emanates from the hood. Speed sensors, fuel pump, converter in the gearbox, ECU, etc., have been changed to no avail. Fault codes are P0077,P0198,P0340,P0501,P0444,P0707,P0560

My car has 138240 miles.
My car has an automatic transmission.

Each of these codes are for different components and since you swapped the motor with a different size motor than what the car had may be a big problem. You would need to have each code diagnosed separately to see if it can be fixed or not.

You have an engine cam sensor code, transmission shift sensor codes and codes that do not go to your car for the transmission, EVAP code and camshaft solenoid codes.

You may need several hours of diagnostics only to find that the two engine differences are the cause and cannot be fixed.

We have articles on most of the trouble codes you mentioned, for further reading:

P0077

P0198

P0340

P0501

P0707

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: Engine light on with P0171 code

The cause behind diagnostic trouble code P0171 is easiest to find by looking at the secondary firing patterns on the Bank one cylinders. That will confirm if the too lean condition, that has caused the code to set, affects all...

Q: How Much Does Using the AC Affect Fuel Economy

There are several variables that will influence the answer to that. It depends on your vehicle, how you drive, where you drive, and how hot it is outside. But there are some things that are certain: operating an A/C system...

Q: How do you put a 1996 Dodge Dakota 5.9 360 motor in a 1999 Jeep Grand Cherokee Laredo with a 4.7 in it or a 4.0?

Hi there. You will have to swap the engine and transmission as a unit with the computer and harness to the other vehicle. There will be a need to fabricate engine mounts if the old mounts will not mount up...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.