2007 Saturn IOn ECU

20

Asked by Feb 26, 2016 at 03:33 PM about the 2007 Saturn ION 2 Sedan

Question type: Maintenance & Repair

I bought a saturn from friend, and the engine light is on, and every so often the
loss engine power light is on, and the cruze control loses its control and i have
to manually speed up. i bought a replacement but it needs to be
reprogrammed, is there anything i can do to check before i pay hundreds? im
a very novice car person.

16 Answers

113,885

Check the power and ground pathways for the engine control system, it only takes 1 ground to be bad or loose to cause all kinds of problems. Did you have the codes pulled before buying a replacement ECM?

20

The codes are for the throttle actuator control and another with the engine harness. Already cleaned the connectors for the ecm and pcm. May have to trace back into the others?

113,885

Pay close attention to the engine harness, you may have corrosion inside it.

20

And that connects all the things to the engine? The ecu pcm power?

113,885

The engine harness will have all of the sensor readings that feed the processor with information and will also have the reference voltage for the sensors from the processor, so you can see how important it is that everything is as it should be.

20

P2135 and P2176 are my codes. Will a cleaner like seafoam help the problem if it's carbon build up? It has 129000 miles on it.

1 people found this helpful.
113,885

It might work, but I would use a throttle body cleaner, the P2135 is a voltage problem, the 2176 is just that the computer has not learned the minimum air rate yet. SeaFoam is used for deeper cleaning like in the injectors or valves when added to the fuel and oil passages if added to engine oil.

20

Any suggestions on which cleaner is best? And if the issue isn't resolved, I will need to track down the voltage problem? At what point do I take it to a auto mechanic?

1 people found this helpful.
113,885

I use CRC, but any brand name will work, just make sure it is throttle body cleaner, not carb cleaner or a generic cleaner.

20

So for the voltage problem using crc would most likely not fix? Thats most likely the grounding or corrosion issue with the harness?

113,885

Correct

20

I took apart the throttle body and cleaned it. It wasn't that dirty. Once I was done the car had no problems for 4 days a record and then when idling in a drive thru it did what it's always done and loss of engine power and such. So if I replace it I should be good?

113,885

Sounds suspiciously like a wiring, possibly a ground or connection problem at either end, did you do a "live Data" scan? If not that might be your beat bet in tracking this gremlin down.

20

How do I do that?

113,885

Blasted spell check, best bet.

113,885

If you don't have a scan tool with that function then a shop that does this will work. Or you could buy one yourself, just make sure it has "live data" and "freeze frame" capabilities, learn how to operate it. The good news that comes from this is then you will be able to test the OBD2 systems on any make and model that is OBD2 compliant.

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