Camaro, Firebird, 1999 - 2002

How To Use This Section

Print

The General Motors (GM) OBD II Section contains information grouped into the three main categories described below:



Vehicle Coverage - This information identifies GM vehicles equipped with OBD II Systems by year, body and engine. Each vehicle has its own Vehicle Identification Number (VIN). This information can be used to look up OBD II P0xxx and P1xxx type codes and their individual descriptions. GM began phase-in of the OBD II System in 1995 on 115,000 vehicles spread across several models. All GM vehicles were equipped with OBD II Systems from 1996-2002.
 
PCM Diagnostics - This information includes an explanation of how the OBD II system incorporates changes to the PCM diagnostics that include new emission control monitoring and control of the Malfunction Indicator Lamp. The articles in this section explain how certain test Conditions: or enable criteria must be met before an OBD II Monitor will run a diagnostic test. An explanation of how each OBD II Monitor runs a particular test is also included in this section.
 
Reference Information - This information includes OBD II Code Descriptions in a two-column table format. The codes are split into two categories: a P0xxx series (SAE defined) and a P1xxx series (OEM defined). The first column in each row contains code numbers and trip designations that identify the type of monitor test (CCM, EGR, etc.) and whether the code is a One Trip (1T) or Two-Trip (2T) type of code. The next column contains the trouble code conditions. Special notes are shown in italics at the bottom of the condition explanation.
 

To use this information, first look up the year, make, model, and in some cases, the specific engine application. Then read the code conditions containing the enable criteria that explain why a code set.

Example of Trouble Code Information

l P0131 1T O2S, MIL Yes l 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2004, 2005 l C/K Series Truck, G Series Van, S/T Series Pickup and Blazer, Envoy Escalade & TrailBlazer l 4.8L VIN V, 5.3L VIN P, 5.3L VIN T, 5.3L VIN Z, 6.0L VIN N, 6.0L VIN U, 8.1L VIN G l Transmissions Alll HO2S-11 (Bank 1 Sensor 1) Circuit Low Input Conditions l DTCP0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0169, P0178, P0179, P0200, P0220, P0300, P0442, P0446, P0452, P0453, P0455, P0496, P1125, P1258, P1514, P1515, P1516, P1518, P2108 and P2135 not set, engine started, engine running in closed loop, system voltage from 10-18v, Fuel Alcohol content less than 90%, fuel level over 10%, TP angle from 3-70% more than the idle value, then during the Lean Test period, the PCM detected the HO2S signal was less than 200 mv for 165 seconds or with engine runtime over 30 seconds, and during the Power Enrichment test period, the PCM detected the HO2S signal was less than 400 mv for 10 seconds. l Possible Causes l Engine misfire condition present (look for P0300 series codes) l Fuel system too lean (possible low fuel pressure, water in fuel) l HO2S signal circuit is shorted to the sensor or chassis ground l HO2S is damaged (i.e., cracked) or air reference hole clogged l PCM has failed
l P0131 2T O2S, MIL Yes l 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2004, 2005 l Deville, Eldorado & Seville l 4.6L VIN 9, 4.6L VIN Y l Transmissions A/Tl HO2S-11 (Bank 1 Sensor 1) Circuit Low Input Conditions l DTCP0101-P0103, P0106-P0108, P0112-P0113, P0116-P0118, P0121-P0123, P0125, P0128, P0200, P0300, P0410-P0446, P0452-P0453, P1258, P1415-P1416 and P1441 not set, AIR, Catalyst and EGR Flow tests off, system voltage 8-18v, no injectors disabled, TP angle from 3-25%, A/F ratio at 14.5-14.81, engine running in closed loop for 3 seconds, and the PCM detected the HO2S signal was less than 75 mv for 5 seconds while in closed loop, or it was less than 575 mv for 8 seconds while operating in Power Enrichment mode. l Possible Causes l Air leaks in the exhaust system, intake manifold, vacuum lines l Engine misfire condition present (look for P0300 series codes) l Fuel system too lean (possible low fuel pressure, water in fuel) l HO2S signal circuit is shorted to the sensor or chassis ground l HO2S is damaged (i.e., cracked) or air reference hole clogged l PCM has failed
 
label.common.footer.alt.autozoneLogo