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I have had a problem passing emissions in IL. I have a cheap obd2 scanner and was having trouble clearing the p0442 code only to find out it is a permanent trouble code. I ran a smoke test and repaired the leaking EVap fitting. I then drove for weeks waiting for the evap readiness monitor to OK and it has just completed. However, I still see the code p0442 stored. All monitors are complete and there is no engine light on. I had expected the code to clear after I made the repair and the evap readiness completed. I need to get it back to test emissions so that I can pass and re register my vehicle. Do the permanent codes clear on their own? If so, how long does it take seeing that all monitors are complete and no light is on. Thanks, Ed ***I am not a professional mechanic but try to do my own repairs.

Hi, We are developing a new software program that focuses on removing DTCs from vehicles. Our support list is very broad and includes trucks as well. I would like to know if you would be interested in such a program? Or you may know people who need it. Let me know. Best regards.

Hello, I recently bought a 2000 GMC Sierra 2500 extended cab SLT 2wd with the 5.3L. I was very excited about this truck initially as I got it at a great price, but I am starting to become overwhelmed with all of its problems I recently discovered. The previous owner purchased this truck at an auction, and put a lot of new parts on it mechanically and cosmetically. There are a lot of mis-matched parts on this truck and I can tell it is somewhat of a "Frankenstein." One thing I noticed is that there are 4x4 buttons on the dash, even though this is a 2wd truck (no T-case). So obviously someone put a new dash on from a 4wd donor. Also, the plastic around the ignition cylinder looks like its been monkeyed with, so someone was probably fooling around near the steering column. When I test drove the truck, the only light on was "Service Engine Soon." However, when I brought my truck to get an OBDII scan at the parts store it returned 14 codes (some duplicates) which are as follows: B0017 - Passenger frontal deployment loop open B0024 - Driver deployment loop short to ground B0036 - Discriminating sensor open or short to voltage B0051 - Deployment commanded C0265 - EBCM relay circuit P0430 - Catalyst system - Low efficiency (Bank 2) P0440 - EVAP system P0449 - Evaporative canister vent solenoid control circuit But, NO lights are ever on the dash except the SES. Shouldn't the airbag or SRS light be on as well? On startup the only lights that come are the SES, nothing else. All the gauges work, although they bounce oddly when I shut off the truck. The voltage needle also twitches very slightly when I use the turn signal. Also, when I turn on the headlamps, the only thing lit up is the cluster. The radio, climate controls, and everything else is dark. And, when I cleared the codes with the ODBII scanner, the radio went off and reset itself to 1:00?! I have literally spent hours on end searching in vain for a definitive answer to this host of problems with only little success. I am guessing that the "B" codes mean that I need a new SDM? Perhaps this truck was in a wreck? P0430 might be because of a small exhaust leak this truck has, or possibly the cat is bad. P0440 and P0449 might mean I need a new EVAP solenoid or can? Please help me, it would be greatly appreciated. This truck means a lot to my little family as it is how we are getting across the country for my new job in Tallahassee. Any insights would be very welcome. Thank you all.

This is my first post and I'm new here. I have a '07 ext cab Silverado, 4.8, 96,000 miles, non-flex fuel, LT, 2WD, 3.23 rear, in Tennessee. The problem started one day when I left a traffic light. I took off and when it reached around 10 mph, it dumped out and then picked back up as if it was out of gas, which I thought it was. It was very low on fuel. I stopped and got some gas but the problem persisted and got worse. I thought I had let the fuel level get low enough to pick up some trash from the bottom of the tank. I've done this before and it clogged up the fuel filter. But, alas, there is no serviceable fuel filter on this truck. I continued driving it with the sputtering/dumping/hesitation/whatever you call it. It feels like you hit the throttle and then once it starts going you've turned the key off. But it picks back up. I finally got a "check engine" light so I pulled the 3 DTC's, which were all fuel pump related, one being the fuel pump relay, which I changed. Cleared the codes, they came back with a vengeance, so I exposed the fuel tank from the top. Back in the day, I could pull the bed off a Silverado with one other person and set it on the ground. This truck has a heavy bed, plus I had no immediate help, so I devised a slick way to slide the bed back three feet by using a couple of 4 ft 4x4 posts and two pieces of 6 ft. conduit, but that's for another post, I guess. Anyway, I pulled the pump, set the pick up in a can of gasoline and wired it straight to the battery. It made way more noise than I thought it would make, plus it barely trickled gasoline out the supply. So I disassembled the rack and cleaned everything to where it all looked like new and tried the straight wire thing again. Same result, so I ordered a new Delphi fuel pump assembly and waited three days for it to show. Hey, $256 vs. $526 at my local dealer is worth a three day wait to me. In the meantime I dropped the spare tire and pulled the plug and cleaned all the terminals of the harness junction and verified a good ground. Got the new pump and installed it. The truck cranked right up and throttled up just as it should, so I put the whole thing back together and went for a test drive. It did the dump out thing almost immediately but not nearly as bad. Also, it doesn't just buck once. It felt like you were trying to break a horse, as if someone was driving and going from no throttle to wide open throttle and back again. If you barely used any throttle at all, it would almost act normally so I knew the problem was in the fuel delivery. However, within ten minutes the engine had sputtered to the point that I barely got it back in to my driveway. Now it will not crank. Fuse, relay and fuel pump have been changed. Ground and wiring are good, but I'm about to put it on jack stands and recheck the ground because I have a funny feeling about it. Any help would be greatly appreciated. I rebuild muscle cars from frame off and everything in between so I'm the guy that has never taken a car to a dealer or a repair shop for anything. My day job is as a Network Engineer so I was one of the few that welcomed the auto computer age so that doesn't scare me either. I will say, though, that this truck requires some searching if you're looking for something like a relay. Thanks in advance for any help.

I found an interesting site just browsing around today and thought I'd pass it on. These are PIT's including the DTC error with description and repair instructions by model. I found several of them for my Silvy that were performed, but didn't ever see the complete description of the fix. There are 44 pages of postings just for the Silverado - these include 2014 -2105 and show where a PI involves multiple years and GM vehicles. Just thought I'd pass this on... for Sierra http://oemdtc.com/Tag/sierra for Silverado http://oemdtc.com/Tag/silverado

2000-05 Engine P codes: 0030 HO2S Heater Control Circuit Sensor 1 0036 HO2S Heater Control Circuit Sensor 2 0101 MAF Sensor Performance 0102 MAF circuit low freq 0103 MAF circuit high freq 0107 MAP low voltage 0108 MAP high voltage 0112 IAT low voltage 0113 IAT high voltage 0117 ECT low voltage 0118 ECT high voltage 0121 TP sensor performance 0122 TP sensor low voltage 0123 TP sensor high voltage 0125 ECT insufficient temp for closed loop 0128 ECT (Eng Cool Temp) below thermostat regulating temp 0130 HO2S Closed Loop Performance Sensor 1 0131 HO2S low voltage Sensor 1 0132 HO2S high voltage Sensor 1 0133 HO2S slow response Sensor 1 0134 HO2S insufficient activity Sensor 1 0135 HO2S heater performance Sensor 1 0137 HO2S low voltage Sensor 2 0138 HO2S high voltage Sensor 2 0140 HO2S insufficient activity Sensor 2 0141 HO2S heater performance Sensor 2 0171 Fuel Trim lean 0172 Fuel Trim rich 201 Injector 1 circuit fault 202 Injector 2 circuit fault 203 Injector 3 circuit fault 204 Injector 4 circuit fault 205 injector 5 circuit fault 206 injector 6 circuit fault 0230 fuel pump relay control circuit 0243 SC boost solenoid control circuit error 300 engine misfire detected 301 Misfire cylinder #1 302 Misfire cylinder #2 303 Misfire cylinder #3 304 Misfire cylinder #4 305 Misfire cylinder #5 306 Misfire cylinder #6 0325 knock sensor system fault 0327 knock sensor circuit fault bank 1 0332 knock sensor circuit fault bank 2 0335 CKP sensor A circuit 0336 CKP circuit fault/performance 0340 CMP sensor circuit 0341 CMP sensor performance 0385 CKP sensor B circuit 0401 EGR insufficient flow 0403 EGR solenoid control circuit fault 0404 EGR open position performance 0405 EGR position sensor low voltage 0410 Secondary Air Injection system 0412 Secondary Air Injection solenoid circuit 0418 Secondary Air Injection pump relay circuit 0420 catalyst system low efficiency 0440 EVAP system fault 0442 EVAP system small leak detected 0443 EVAP purge sol control faule 0446 EVAP VENT system performance 0449 EVAP VENT sol control circuit 0452 fuel tank pressure sensor low volt 0453 fuel tank pressure sensor hi volt 0462 fuel level sensor low voltage 0463 fuel level sensor high voltage 0480 cooling fan relay 1 control circuit 0481 cooling fan relay 2 control circuit 0506 idle speed too low 0507 idle speed too hi 0522 Eng Oil Pressure Sensor low volt 0523 Eng Oil Pressure Sensor hi volt 0530 A/C pressure sensor circuit fault 0560 PCM system voltage error 0601 PCM Read Only Memory Fault 0602 PCM not programmed 0603 PCM Long Term Memory Reset 0604 PCM Random Access Memory Fault 0605 PCM Programming Read Only Memory Fault 0606 PCM Internal Performance 0607 PCM Performance 0620 generator performance 0650 MIL control circuit 0654 Engine Speed Output Circuit 0656 fuel level output circuit 1106 MAP sensor circuit intermittent hi volt 1107 MAP sensor circuit intermittent low volt 1111 IAT sensor intermittent hi volt 1112 IAT sensor intermittent low volt 1114 ECT sensor intermittent low volt 1115 ECT sensor intermittent hi volt 1121 TPS intermittent hi volt 1122 TPS intermittent low volt 1133 HO2S insufficient switching sensor 1 1134 HO2S transition time ratio sensor 1 1189 Engine Oil Pressure Switch Circuit 1200 Air fuel ratio 1260 Fuel pump speed control relay circuit 1336 Crank Position System Variation not learned 1351 ign control (or coil 1) circuit hi volt 1352 ign bypass (or coil 2) circuit hi volt 1353 ign coil 3 circuit high volt 1354 ign coil 4 circuit high volt 1355 ign coil 5 circuit high volt 1356 ign coil 6 circuit high volt 1361 ign control (or coil 1) circuit low volt 1362 ign bypass (or coil 2) circuit low volt 1363 ign coil 3 circuit low volt 1364 ign coil 4 circuit low volt 1365 ign coil 5 circuit low volt 1366 ign coil 6 circuit low volt 1372 CKP sensor A-B correlation 1374 CKP high to low res freq correlation error 1380 misfire detect - no rough road data avail 1381 misfire detect - no comm w/ EBTCM 1404 EGR closed position performance 1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance 1441 EVAP system flow during non-purge 1483 engine cooling system performance 1546 a/c relay control circuit 1554 cruise control feedback circuit error 1571 trac control torque req circuit error 1575 Extended Travel Brake Switch 1585 cruise control inhibit output circuit 1600 PCM Long Term Memory Reset (2) 1602 lost comm w/ EBTCM (ABS) system 1604 lost comm w/ Driver Info Display Control Sys 1605 lost comm w/ HVAC system 1610 lost comm w/ BCM 1621 PCM Long Term Memory Performance 1626 VATS fuel enable signal lost 1629 VATS fuel enable signal not rec'd 1630 VATS learn mode active 1631 VATS start enable signal not correct 1635 5 volt ref circuit 1 1637 charge system indicator lamp control circuit 1639 5 volt ref circuit 2 1640 Output Driver Module (ODM) Circuit 1 Error 1650 Output Driver Module (ODM) Circuit 2 Error 1653 fuel level OR low oil lamp output circuit 1660 Output Driver Module (ODM) Circuit 3 Error 1663 charging sys lamp OR change oil lamp circuit 1670 Output Driver Module (ODM) Circuit 4 Error 1673 Eng cool temp HOT lamp control circuit 1689 Trac control delivered torque output circuit http://repair-manuals-download.jimdo.com/gmc-fault-codes/ 2000-05 Transmission P codes: 0218 transmission fluid overtemperature 0502 VSS circuit low input 0503 VSS circuit intermittent 0711 trans fluid temp sensor range/performance 0712 trans fluid temp sensor circuit low input 0713 trans fluid temp sensor circuit high input 0716 input speed sensor circuit intermittent 0717 input speed sensor circuit low input 0719 brake switch circuit low input 0724 brake switch circuit high input 0730 incorrect gear ratio 0740 TCC enable solenoid circuit electrical 0741 TCC stuck off 0742 TCC stuck on 0748 pressure control solenoid circuit electrical 0751 shift solenoid A valve performance - no 1st or 4th gear 0752 shift solenoid A valve performance - no 2nd or 3rd gear 0753 shift solenoid A circuit electrical 0756 shift solenoid B valve performance - no 1st or 2nd gear 0757 shift solenoid B valve performance - no 3rd or 4th gear 0758 shift solenoid B circuit electrical 1810 trans fluid pressure valve position switch circuit 1811 maximum adapt and long shift 1814 Torque Converter Overstressed 1819 Internal Mode Switch (IMS) no start / incorrect range 1820 Internal Mode Switch (IMS) Circuit A Low 1822 Internal Mode Switch (IMS) Circuit B High 1823 Internal Mode Switch (IMS) Circuit P Low 1825 Internal Mode Switch (IMS) Invalid Range 1826 Internal Mode Switch (IMS) Circuit C High 1860 TCC PWM solenoid circuit electrical 1870 Trans component slipping 1887 TCC release switch circuit http://repair-manuals-download.jimdo.com/gmc-fault-codes/ 1997-99 Engine codes 101 MAF Sensor Performance 102 MAF circuit low freq 103 MAF circuit high freq 107 MAP low voltage 108 MAP high voltage 112 IAT low voltage 113 IAT high voltage 117 ECT low voltage 118 ECT high voltage 121 TP sensor performance 122 TP sensor low voltage 123 TP sensor high voltage 125 ECT insufficient temp for closed loop 131 HO2S low voltage Sensor 1 132 HO2S high voltage Sensor 1 133 HO2S slow response Sensor 1 134 HO2S insufficient activity Sensor 1 135 HO2S heater performance Sensor 1 137 HO2S low voltage Sensor 2 138 HO2S high voltage Sensor 2 140 HO2S insufficient activity Sensor 2 141 HO2S heater performance Sensor 2 171 Fuel Trim lean 172 Fuel Trim rich 201 Injector 1 circuit fault 202 Injector 2 circuit fault 203 Injector 3 circuit fault 204 Injector 4 circuit fault 205 injector 5 circuit fault 206 injector 6 circuit fault 230 fuel pump relay control circuit 243 SC boost solenoid control circuit error 300 engine misfire detected 301 Misfire cylinder #1 302 Misfire cylinder #2 303 Misfire cylinder #3 304 Misfire cylinder #4 305 Misfire cylinder #5 306 Misfire cylinder #6 325 knock sensor system fault 327 knock sensor circuit fault bank 1 332 knock sensor circuit fault bank 2 335 CKP sensor A circuit 336 CKP circuit fault 340 CMP sensor circuit 341 CMP sensor performance 385 CKP sensor B circuit 401 EGR insufficient flow 403 EGR solenoid control circuit fault 404 EGR open position performance 405 EGR position sensor low voltage 410 Secondary Air Injection system 412 Secondary Air Injection solenoid circuit 418 Secondary Air Injection pump relay circuit 420 catalyst system low efficiency 440 EVAP system fault 442 EVAP system small leak detected 443 EVAP purge sol control faule 446 EVAP VENT system performance 449 EVAP VENT sol control circuit 452 fuel tank pressure sensor low volt 453 fuel tank pressure sensor hi volt 462 fuel level sensor low voltage 463 fuel level sensor high voltage 480 cooling fan relay 1 control circuit 481 cooling fan relay 2 control circuit 506 idle speed too low 507 idle speed too hi 522 Eng Oil Pressure Sensor low volt 523 Eng Oil Pressure Sensor hi volt 530 A/C pressure sensor circuit fault 550 Power Steering Pressure switch circuit 560 PCM system voltage error 601 PCM Read Only Memory Fault 602 PCM not programmed 620 generator performance 650 MIL control circuit 654 Engine Speed Output Circuit 656 fuel level output circuit 705 trans range switch circuit 706 trans range switch performance 1106 MAP sensor circuit intermittent hi volt 1107 MAP sensor circuit intermittent low volt 1111 IAT sensor intermittent hi volt 1112 IAT sensor intermittent low volt 1114 ECT sensor intermittent low volt 1115 ECT sensor intermittent hi volt 1121 TPS intermittent hi volt 1122 TPS intermittent low volt 1133 HO2S insufficient switching sensor 1 1134 HO2S transition time ratio sensor 1 1257 Supercharger engine overboost 1260 Fuel pump speed control relay circuit 1336 Crank Position System Variation not learned 1350 Bypass line monitor 1351 ign control (or coil 1) circuit hi volt 1352 ign bypass (or coil 2) circuit hi volt 1353 ign coil 3 circuit high volt 1354 ign coil 4 circuit high volt 1355 ign coil 5 circuit high volt 1356 ign coil 6 circuit high volt 1361 ign control (or coil 1) circuit low volt 1362 ign bypass (or coil 2) circuit low volt 1363 ign coil 3 circuit low volt 1364 ign coil 4 circuit low volt 1365 ign coil 5 circuit low volt 1366 ign coil 6 circuit low volt 1372 CKP sensor A-B correlation 1374 CKP high to low res freq correlation error 1380 misfire detect - no rough road data avail 1381 misfire detect - no comm w/ EBTCM 1404 EGR closed position performance 1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance 1441 EVAP system flow during non-purge 1483 engine cooling system performance 1520 Park/Neutral Position (PNP) switch circuit 1546 a/c relay control circuit 1554 cruise control feedback circuit error 1571 trac control torque req circuit error 1573 lost comm w/ EBTCM (ABS) system 1575 Extended Travel Brake Switch 1585 cruise control inhibit output circuit 1602 lost comm w/ EBTCM (ABS) system 1604 lost comm w/ Driver Info Display Control Sys 1605 lost comm w/ HVAC system 1610 lost comm w/ BCM 1619 Engine oil life monitor reset switch circuit 1626 VATS fuel enable signal lost 1629 VATS fuel enable signal not rec'd 1630 VATS learn mode active 1631 VATS start enable signal not correct 1635 5 volt ref circuit 1 1637 charge system indicator lamp control circuit 1639 5 volt ref circuit 2 1641 A/C clutch relay control circuit 1642 change engine oil lamp control circuit 1646 SC boost solenoid control circuit error 1651 cooling fan relay 1 1652 cooling fan relay 2 1653 fuel level OR low oil lamp output circuit 1662 cruise control inhibit output circuit 1663 charging sys lamp OR change oil lamp circuit 1665 EVAP VENT solenoid circuit 1667 Fuel pump speed control relay circuit 1671 MIL control circuit 1672 low engine oil level lamp control circuit 1673 Eng cool temp HOT lamp control circuit 1676 EVAP purge sol control circuit 1689 Trac control delivered torque output circuit 1997-99 Transmission P codes: 218 transmission fluid overtemperature 502 VSS circuit low input 503 VSS circuit intermittent 711 trans fluid temp sensor range/performance 712 trans fluid temp sensor circuit low input 713 trans fluid temp sensor circuit high input 716 input speed sensor circuit intermittent 717 input speed sensor circuit low input 719 brake switch circuit low input 724 brake switch circuit high input 730 incorrect gear ratio 740 TCC enable solenoid circuit electrical 741 TCC stuck off 742 TCC stuck on 748 pressure control solenoid circuit electrical 751 shift solenoid A valve performance 753 shift solenoid A circuit electrical 756 shift solenoid B valve performance 758 shift solenoid B circuit electrical 1810 trans fluid pressure valve position switch circuit 1811 maximum adapt and long shift 1814 Torque Converter Overstressed 1860 TCC PWM solenoid circuit electrical 1870 Trans component slipping 1887 TCC release switch circuit http://repair-manuals-download.jimdo.com/gmc-fault-codes/