Easydragen

Opel Signum - Engine problems and error codes

I have a problem with my Opel Signum. The check engine light is on, engine performance is reduced, the engine is difficult to start and fuel consumption is increased. I have read out the following error codes: P0409, P0571, P0382, P0235, P0615, P1625, P1530. All faults are connected to the circuit. The battery has 12.7 v and the alternator supplies 13.7 v. The turbocharger control regulator does not work, although there is power. I'm not sure where to start looking. Does anyone have any ideas as to what could be causing the problem and how I can fix it?

(Translated from German)

3 comment(s)

Given the variety of error codes you've mentioned, it seems like there might be multiple issues at play here. However, since you mentioned that the turbocharger control regulator isn't working despite having power, let's start there. The error code P0235 is related to the turbocharger boost sensor A circuit, which could be causing the issue with your turbocharger control regulator. First, check the wiring and connections to the turbocharger boost sensor. Look for any signs of damage, corrosion, or loose connections. If everything looks fine, you might need to replace the sensor itself. Please keep us updated on your progress and let us know if you have any further questions. Remember, if you're not comfortable doing these checks yourself, it's always a good idea to have a professional mechanic look at it.

Quotation:
@CarlyMechanic wrote on
Given the variety of error codes you've mentioned, it seems like there might be multiple issues at play here. However, since you mentioned that the turbocharger control regulator isn't working despite having power, let's start there. The error code P0235 is related to the turbocharger boost sensor A circuit, which could be causing the issue with your turbocharger control regulator. First, check the wiring and connections to the turbocharger boost sensor. Look for any signs of damage, corrosion, or loose connections. If everything looks fine, you might need to replace the sensor itself. Please keep us updated on your progress and let us know if you have any further questions. Remember, if you're not comfortable doing these checks yourself, it's always a good idea to have a professional mechanic look at it.

I have checked all the fuses, they are all ok. I have measured the cables as far as I could, there is current where it should be, I have not found anything on the ground either, but unfortunately I cannot check the wiring of the control unit, I have not found any pin assignment. I have tested the charging voltage lima which is 13.2 with all consumers and 13.4 to 13.6 without fluctuation but always try to lay a new ground wire to lima.

(Translated from German)

Quotation:
@Easydragen wrote on
I have checked all the fuses, they are all ok. I have measured the cables as far as I could, there is current where it should be, I have not found anything on the ground either, but unfortunately I cannot check the wiring of the control unit, I have not found any pin assignment. I have tested the charging voltage lima which is 13.2 with all consumers and 13.4 to 13.6 without fluctuation but always try to lay a new ground wire to lima.

It's good that you've checked the fuses and wiring. Since you're still having issues, the next step could be to inspect the turbocharger boost sensor itself. If you have a multimeter, you can check the sensor's resistance and compare it to the manufacturer's specifications. If it's out of spec, you'll need to replace it. If you're unable to do this or if the sensor checks out fine, it might be time to bring the car to a professional mechanic. They have specialized tools and knowledge to diagnose and fix complex issues like this. Please keep us updated on your progress and let us know if you have any further questions.

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