First of all, sorry I haven't been around lately. I just got back from an 8 day florida trip and christmas and everything else was real busy. Ok now down to business. My SES light comes on occassionally and I scanned my historical codes and it came up code 275 which is boost control failure (overboost). Does anyone have anymore information on this code? I cant even find anything on it in alldata at my dads shop. Also, I did replace my boost control solenoid recently so that must not be the problem but I do have a smaller supercharger pulley. Could the small supercharger pulley be causing it? I am having such bad luck with my SES light recently and bad gas mileage. Any help would be tremendous. thanks

The PCM overboost protection COULD be setting a history code with a smaller pulley. Do you feel or see your boost drop off on the high end with WOT?

If you're getting overboost, try the re-plumb of the solonoid. A couple posts in forced induction regarding that.

DTC P0275 Cylinder 5 Contribution/Balance Fault
Does not equal > My SES light comes on occassionally and I scanned my historical codes and it came up code 275 which is boost control failure (overboost).

deathrat. i got the same thing when i looked up the code online but the scantool says its overboost

I do not see that code in the 1994 Factory Service Manual. Check the code number again.

yeah i know its stupid code. its not listed in alldata either. I checked the code twice

FYI Code P1257 is for a boost control problem.

Here'* the list of DTC Codes I've found:

http://www.bonnevilleattitude.com/fo...topic.php?t=62

Okay then what "Scantool" are you using? Is it a GM Tech II? MAC? Snap On?

As for SC codes......


DTC P0234 TC Engine Overboost Condition
DTC P0235 Turbocharger Boost Sensor 1 Circuit
DTC P0236 TC Boost System
DTC P0237 TC Boost Sensor Circuit Low Voltage
DTC P0238 TC Boost Sensor Circuit High Voltage
DTC P0239 Turbocharger Boost Sensor 2 Circuit
DTC P0240 Turbocharger Boost Sensor 2 Performance
DTC P0241 Turbocharger Boost Sensor 2 Circuit Low Voltage
DTC P0242 Turbocharger Boost Sensor 2 Circuit High Voltage
DTC P0243 Turbocharger Wastegate Solenoid 1
DTC P0244 Turbocharger Wastegate Solenoid 1 Performance
DTC P0245 Turbocharger Wastegate Solenoid 1 Low Voltage
DTC P0246 Turbocharger Wastegate Solenoid 1 High Voltage
DTC P0247 Turbocharger Wastegate Solenoid 2
DTC P0248 Turbocharger Wastegate Solenoid 2 Performance
DTC P0249 Turbocharger Wastegate Solenoid 2 Low Voltage
DTC P0250 Turbocharger Wastegate Solenoid 2 High Voltage

its a snap on scantool