How do you reset a service engine soon light

[Rock_28]

I have a 2000 GP SE, and need to know how to reset the service engine soon light. Help

[BNaylor]

Originally Posted by Rock_28

I have a 2000 GP SE, and need to know how to reset the service engine soon light. Help

Which engine the 3.8L or 3.1L? Try this it may or may not work.


This works on most '97 and up GM "F" and "W" body cars:

Remove battery POSITIVE cable.

Take ignition to full on/start position and hold for minimum of 1 minute.

Take ignition back to off. However, key will not return to off and will be stuck due to lack of battery power.

Reconnect battery positive. Various relays will chatter.

Now take key forward then back to off. It should now remove.

Re-insert key and start engine. SES should be off unless a Class "A" DTC error code immediately triggers it.

This resets any and and all DTC error codes stored and WILL clear a SES light. If it doesn't work then you will need a odb-ii scanner with reset.

BTW - If it works don't ask me how or why it does.

Good luck!

[GTP Dad]

The first thing you need to do is find out the codes and repair the issue that is causing the light to stay on. After you get the codes the same scanner that read the codes can be used to clear the codes and thereby shut off the SES light. If you don't repair the issue then the light will come back on.

[jimmyv-21]

gtp dad is correct. but i have still have a question- i have had the light shut itself off after i fix the problem and a few drive cycles. will this work for all codes or only certian ones?

[BNaylor]

PCM Basics & Diagnostics 101:

There are 4 types of DTC error codes by category:

Type "A" - Emissions related, turns on MIL (SES) light the first time DTC sets.

Type "B" - Emissions related, turns on MIL (SES) light if fault is active for 2 consecutive driving cycles.

Type "C" - Non-emissions related, does not turn on MIL (SES) light but may turn in SERVICE VEHICLE SOON light.

Type "D" - Non-emissions related, does not turn on MIL (SES) light or SERVICE VEHICLE SOON light.

There are two category of failures hard and intermittent.

A hard failure will cause the MIL light to turn on and remain on until the malfunction is repaired.

An intermittent failure may cause the MIL light to flicker or glow and go out (flash) about 10 seconds after the intermitent fault goes away. However, a corresponding DTC will be retained in PCM memory. If a related fault does not occur in up to 50 drive cycles (engine starts) the DTC error code will be erased from memory by the PCM.

Certain DTC error codes classified as "A" are hard and normally will not reset or cure themselves. It will require a reset after review of the error code and corrective action. However, there are certain class "A" DTC error codes after corrective action is taken and when the PCM runs the test that will erase themselves and turn off the MIL (SES) light. Evaporative emissions codes are a good example. Loose gas cap P0440 - 0442.

Codes classified as "B" may clear themselves after a predetermined drive cycle but it varies.

GM categorizes DTC codes and you need to review the Master Code or Mode 6 code listings for your specific year, model and make of vehicle. A GM service manual will contain all DTC error codes applicable to your vehicle. The code description will contain what class the DTC error code is.

[toebitus]

hi all,i`m looking to buy a obd2 reader,for home use,perferably under 100.00 dollars, have ya`ll any suggestions? i have a 1997 jeep wrangler,1997 dodge 1500 4x4,2001 sunfire and 2 non-obd(1980 fiat,1993 mx5).also looking tohelp out with a 1996 grand am with passkey/dashboard problem(no start)

[BNaylor]

Originally Posted by toebitus

hi all,i`m looking to buy a obd2 reader,for home use,perferably under 100.00 dollars, have ya`ll any suggestions? i have a 1997 jeep wrangler,1997 dodge 1500 4x4,2001 sunfire and 2 non-obd(1980 fiat,1993 mx5).also looking tohelp out with a 1996 grand am with passkey/dashboard problem(no start)

I found the best place to get a odb-ii scanner is EBay. Better prices than the national auto parts stores. Actron is a good user friendly model. The CP9135 is under $100. Equus is another company that makes inexpensive scanners. There are a bunch of them out there but I can only relate the models I am familiar with.

I have the Actron CP9145 which reads both generic and extended codes. The problem with the ones under $100 is they are probably good for generic codes only but it is better than nothing and making trips to Autozone. All will reset the SES light and clear any DTC error codes that may be stored.

Good luck!

[toebitus]

ur 9145.will it show the gm passkey codes