2001 monte carlo SS service vehicle soon message HELP

[jimchevytk]

i have a 2001 monte carlo ss with 50,000 miles. In the last few months the service vehicle soon message light comes on and will reset if you turn the car off and restart. this has happened 5 times. in sept of 05 gm issued a recall on the catalyic converter. last week the car had very poor acceleration and when I would rev the motor to 4000rpm it would sputter/ miss out etc etc. I called the dealer and he said it was probably the converter. each time the light came on and off i took the car to an auto part store they checked for codes and NO codes have shown up at all. They dealer replaced the converter at no charge and the car ran like its supposed to. 2 days after the converter was replaced the service vehicle soon message appeared again. i check for codes and nothing again. the dealer could not find any codes either. the car seems to be running ok but i cant figure out what is causing the service vehicle soon message to come on.. the vehicle is well taken care of. Anyone having the same problem or can help me out with this one please email me at [email protected] I called the dealer today and offered to check for codes at no cost. Help Help Help...Thanks Jim

[GVAR]

I have a 96 monte carlo and the same thing happened to me. I finally brought it to advance auto parts and left it running with the light on. That is the only way they can get the code if it keeps turning off on you. It was an O2 sensor that was the problem. I changed it and everything is fine now. The old O2 sensor was killing my gas millage too. If it turns on take it to advance auto parts or an autozone and leave it running so they can check the code.

[jimchevytk]

Thanks, I will try that. I understand that there are 2 O2 sensors one before and after the converter. I drove the car today no service engine soon message but when my wife drives the message comes on..HMMMMM

Jim

[jimchevytk]

The Service Vehicle Soon message came on again I took it to Advance Auto Parts they hooked up there computer NO CODE. I took to the Dealer a week later and they checked for all codes at no charge and they couldnt find anything. Sorry I did write in early post that it was the Service Engine. Its not its Service Vehicle Soon Message. Still the car runs great. I called another dealer and their service manager said its more of a body/frame message and has nothing to do with the engine. If anyone has experienced this please replay back.

Thanks Jim

[GVAR]

Ok I have a list of code for a monte. I have never heard of a body/frame code??? Hope that helps


PO121 Throttle/Petal Position Sensor/Switch A Circuit Range/Performance Problem
PO128 can't find anything for this code
PO130 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
PO131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
PO132 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
PO133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
PO134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
PO137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
PO138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
PO171 System too Lean (Bank 1)
PO172 System too Rich (Bank 1)
PO300 Random/Multiple Cylinder Misfire Detected
PO325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
PO327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
PO332 Knock Sensor 2 Circuit Low Input (Bank 2)
PO116 Engine Coolant Temperature Circuit Range/Performance Problem
PO125 Insufficient Coolant Temperature for Closed Loop Fuel Control
PO128 still can't find anything for this code
PO135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
PO141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
PO171 System too Lean (Bank 1)
PO172 System too Rich (Bank 1)
PO300 Random/Multiple Cylinder Misfire Detected
PO325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
PO327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
PO332 Knock Sensor 2 Circuit Low Input (Bank 2)
PO440 Evaporative Emission Control System Malfunction
PO442 Evaporative Emission Control System Leak Detected (small leak)
PO446 Evaporative Emission Control System Vent Control Circuit Malfunction
PO730 Incorrect Gear Ratio
P1189 something to do with air- fuel mixture

[jimchevytk]

Thanks for the Codes. When I took the car to Advanced Auto Parts the last time the service vehicle soon message was ON and I left the car running. Still no code.

Jim

[beanpole1]

I have similar problem in 2001 Tahoe with message po130, sensor1, bank1. I understand there are for O2 sensors. How do I know which is bad one?
Beanpole1

[richtazz]

jimchevytk, the service vehicle soon light is different from the check engine light. The check engine light is the one that will come on when an OBDII fault code is stored that can be pulled by AZ and Advance.

According to the owners manual for an 03 model, the service vehicle soon lamp indicates an engine related problem that may or may not affect performance. It states to consult a qualified dealership for necessary repairs to maintain top vehicle performance. It appears that this indicator light is independent of the MIL(Malfuncion Indicator Lamp)/Check Engine light. I wish I had more specific info for you, but check your owners manual and see if your's has better, less cryptic info.