Quick Answer: Can I Just Swap ECU?

How long does it take to change an ECU?

You can usually find the exact location of your car’s computer module in the owner’s manual and from there you basically unplug the old and plug in the new.

If you take your car into a dealer to replace the ECM, it will usually take about an hour or two..

What causes an ECU to fail?

Corrosion and moisture Corrosion or damage due to moisture is one of the main reasons for ECM failure. Corrosion can enter the ECM through the wiring harness and moisture can enter by a failure in the seals in the ECM itself. This happens over a period of time (5 to 10 years) due to the ECMs exposure to the elements.

How do you know if your ECU is faulty?

These are the symptoms of a bad or failing engine control unit (ECU)Check Engine Light comes on. An illuminated Check Engine Light is one possible symptom of a problem with the ECU. … Engine stalling or misfiring. Another symptom of a bad or failing ECU is erratic engine behavior. … Engine performance issues. … Car not starting.

Can a second hand ECU be reprogrammed?

Yes. In fact, if you want to change the ECU for any reason, a dealer will have to reprogram your keys into the ECU. Or it will not start.

Can a ECU be repaired?

ECU repairs can be very expensive. The part alone can cost between $1,000 and $3,000, depending on the make and model of your vehicle. Fortunately, an ECU can be repaired or reprogrammed in many cases—thus preventing the need to actually replace an ECU.

How do I reprogram my ECU in my car?

Programming overviewConnect the vehicle interface cable to the OBD-II connector and turn the ignition switch to ON.Open the ProECU software and choose Tools then Detect Vehicle.Select Program Engine ECU.Choose Query ECU to identify the ECU version fitted to the car.More items…

What does resetting an ECU do?

“Resetting the ECU” is the process of clearing all the long term memory from the ECU’s memory. These variables trim idle speed, fuel, spark, and more. The ECU will also store trouble codes for diagnostic capability.

Does a new ECU need to be programmed?

A “new” ECU will almost certainly need programming to the car – if nothing else there will be anti-theft measures such as the immobilizer to consider and potentially other systems in the car for it to be configured with.

How long does battery need to be disconnected to reset ECU?

about 30 secondsIt’s a real tight fit, but if you can find it and disconnect it, leave it disconnected for 30 seconds. The nice thing about this method over the “disconnect the negative cable” method is that you don’t have to reprogram your radio! If you can’t find it, then do the negative cable – again for about 30 seconds.

Will disconnecting battery reset ECU?

Will disconnecting battery reset ECU? Can a ECU be reset? Yes, all ECU (Engine Control units) can be reset and be should reset once per manufacturer’s guideline for a smooth relearn process or upon installing a replacement unit.

Can I drive my car with a bad ECM?

A bad ECM may lead to a vehicle that won’t or is difficult to start. If the ECM fails completely, it will leave the vehicle without engine management control, and will not start or run as a result. The engine may still crank, but it will not be able to start without the vital inputs from the computer.

Can you bypass a ECU?

Bypassing the ECU entirely would typically require an after market ECU to be installed to continue to manage the engine (ignition timing and fuel metering at the minimum) so I highly doubt it has been bypassed. It is however possible that some sensors have been bypassed which could cause problems.

What happens if you unplug the ECU?

However, if the ECU is unplugged, it will retain any charge it may have even if you create a power draw someplace else in the vehicle. So you’d need to wait a decent amount of time to be “sure” it’s drained. Some folks go so far as to unplug the battery and let the car sit over night.

How much does it cost to have ECM programmed?

Pre-Programmed Engine Control Modules ECM Repair costs and labor at a dealership could be anywhere from $1,000 to $2,000 depending on the vehicle. Once the control module is installed then the unit must be programmed to match the vehicle it’s being installed in which requires expensive software and equipment.