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Dave Nova
Dave Nova, Buick Technician
Category: Buick
Satisfied Customers: 1808
Experience:  ASE Master Certification. GM World Class Certification
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2008 BUICK ENCLAVE CXL AWD; FOR SOME TIME HAVE HAD P CODES

Customer Question

2008 BUICK ENCLAVE CXL AWD;
FOR SOME TIME HAVE HAD P CODES P0420, P0430, 4 WEEKS AGO NOTE Y PIPE SCREEN COVERING RUBBER DAMAGED. IN THIS TIME FRAME OF LAST 2-3 MONTH ON AND OFF MORE TIMES OFF FEEL LOST OF ENGINE POWER, THEN ON DASH DISPLAY TRACTION CONTROL OFF, SERVICE TRACTION CONTROL, SERVICE STABILITRAK, ALL COMES ON WITH CHK. ENG.LIGHT. THIS HAS BEEN HAPPENING LIKE A GHOST FROM MY WIFE. I CHK. CONNECTION, SCAN FOR CODES SAME ABOVE. I DRIVE IT ONLY CHK. ENG. LIGHT ON, NO DASH DISPLAY ABOVE SYSTEMS GOING OFF. WIFE SAYS AFTER A FEW MINUTES WAITING STARTS UP GOT POWER SYSTEM WARNINGS GONE DRIVES FINE.
**SPECIAL NOTE** ABOUT A YEAR PLUS A FEW MONTHS CAR WENT ERRATIC LOSS ENGINE POWER, DASH INSTRUMENT PANEL GAUGES ERRATIC OPERATION ON/OFF, RPM/SPEED NEEDLES WAVING, A/C AND FAN CONTROL WENT NUTS. ON DASH WARNING SCREEN SAW NIGHT MARE "NO BUS" ON DISPLAY. TURN CAR AROUND ONE BLOCK FROM HOME GOT A RENTAL CAR LEFT FOR FOUR DAY ANNIVERSARY. ( WHEN I WORK ON LARGE TRUCK, FIRE / RESCUE, AND GET " NO BUS" MEANING NO COMMUNICATION TO OR FROM ALL SYSTEMS A LOT TO DO.)
SO RETURN FROM 4 DAYS OUT TO GET IN TO IT. START UP ALL SYSTEMS OPERATIONAL ENGINE FULL POWER, A/C, DASH GAUGES WORKING FINE, CHK. ENG. LIGHT OUT. SCAN MONITOR ENG. FUNCTIONS RPM,O2 SENSORS,TPS,MAF,EGR,SHORT/ LONG TERM BURN, OPEN/CLOSE LOOP,O-ODOMETER SPEED READING CORRECT DRIVING, CHK. DROVE GREAT STAYED CLOSE TO HOME 5 TO 8 WEEKS BEFORE PLANNING LONGER TRIPS. NEVER SAW THE "NO BUSS" WARNING AGAIN.
NOW 2 DAYS AGO SYMPTOMS ALMOST THE SAME JUST CHK. ENG.LIGHT, NO POWER ,
NEW CODES ARE P0201, P0203, P0205, P0420, P0430,
TRACTION CONTROL OFF, SERVICE TRACTION CONTROL, SERVICE STABILITRAK,
ONLY. TRY CLEARING ECM OR COMPUTER CONTROL. TO HAVE ONE BANK OF INJECTOR GO AM I LOOK AT BAD DRIVERS IN THE COMPUTER. STILL WORK ON THE "Y" PIPE THEN POSSIBLE O2 SENSORS,THEN WHAT ELSE THOUGHT TO RE FLASH COMPUTER, OR LOOK IN TO REPLACING IT.THEN WHAT ELSE??????
Submitted: 3 months ago.
Category: Buick
Expert:  Chris (aka- Moose) replied 3 months ago.

Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.working after noon till just after midnight.

  • Sorry no one has helped yet.
  • Yes, you have been charged already.
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  • I will be online a couple more hours after this post.
  • This is not an answer to your question, just an inquiry if your still needing/wanting help. Because I believe I can help.
Customer: replied 3 months ago.
YESTERDAY I PULL ALL THE PLUGS NO DEFERENCE ALL DRY NORMAL FIRE SOME WERE, MY OWNING NEVER CHANGED. NO WET PLUGS RUNNIG ON 3CYL. WOULD BE NO FUEL DROP ON 3 INJECTORS HAVE NOT TESTED INJECTOR PULSE YET PUTTING IN NEW PLUGS SO FAR BEFORE RAINS COMES.
Expert:  Chris (aka- Moose) replied 3 months ago.

Will your tool monitor the wheel speed sensors while driving? If not then your tool can only get engine codes. Which is why you can not get the codes from the ABS module.

Have you done any diag steps for the codes you have?

Customer: replied 3 months ago.
HEY YES CAN MONITOR VEHICLE SPEED FROM TRANSMISSION REFERENCE SPEED SENSOR, DON'T HAVE A ABS LIGHT ON ABS IS OPERATIONAL. CAN READ ENG. FUNCTIONS WHILE DRIVING. CONDITION ACCRUES MORE TIMES AT A STOP IN GEAR OR JUST AFTER START UP WHEN IN CLOSE LOOP ABOUT TO MOVE OR LOW SPEED 5 TO 10MPH. IF ONLY ONE CODES WITH NO WARNING MESSAGES WOULD TROUBLE TREE CONDITION. BUT WITH MULTI CODES OF CYLINDERS 135 BANK INJECTORS AND MULTI- MESSAGES FROM WARNING CENTER AS ;
1. TRACTION CONTROL OFF
2. SERVICE TRACTION CONTROL
3. SERVICE STABILITRAK
4. ON MY SCANNER READING OF FUEL SYSTEM 1&2 STATUS "OPEN LOOP DUE TO SYSTEM FAILURE"
SHOWS SYSTEMS TURN OFF FOR LACK OF ENG. POWER AND TORQUE. HAVE CHK. DIAG. STEPS ARE NOT RELATED TO MY CONDITIONS.
1. I HAVE THREE INJECTOR 135 BANK NO FUEL DROP.
2. I HAVE Y PIPE DAMAGED EXHAUST LEAK FOR SOME TIME, JUST FOUND RESENT, DROVE WITH ALL CYLINDERS FIRING ENG. POWER GOOD NO WARNING MESSAGES FOR THE LAST FEW MONTHS. JUST GOT WORST REAL FAST.
3. I HAVE BEEN WATCHING O2' SENSOR FOR LAZY NUMBERS WITH EARLY CODES P0420, P0430 BEFORE. NEW CONDITION WAS INTERMITTENT NOT ALL THE TIME OVER LAST 5 TO 6 MONTH, ABOUT 3-4 TIMES THEN JUST WENT AWAY COULD NOT TROUBLE TREE EACH TIME WAS VERY SHORT TIME TO FIND PROBLEMS.
JUST THIS WEEKEND REPLACE ALL PLUGS ALL BURNING NORMAL DRY. WERE NEVER REPLACE ON MY OWNING. WHEN INSTALLED PLUGS SWAP COILS 135 WITH 246. LEFT COILS UNPLUGGED ON THE 246 AFTER THE SWAP OF COILS. TRY TO START ENG. NO START PLUGGED IN 246 COILS ENG. STARTED ROUGH RUNNING, NO POWER, CHK. LIGHT ON, 3 WARNING MESSAGES. LESS THEN A MINUET ENG. SMOOTH OUT, ALL WARNINGS AND CHK. ENG. LIGHT OUT, ENG. ALL CYLINDERS FIRING HAS POWER. WENT TO GET SCANNER.ENG. RETURNED BACK TO BAD CONDITIONS ALL CHK.ENG. LIGHT ON SAME CODES, SAME MESSAGES. HEARD SOUND FROM ENG. AREA LIKE A LOW FLUID POWER STEERING PUMP. EACH TIME CLEARED CODES SOUND STOPS. FOR THAT SHORT TIME ALL PLUGS FIRING,ALL COILS WORKING, ALL INJECTORS PULSING FUEL DROP. COULD NOT READ 02 SENSORS BEFORE GOING BAD CONDITION AGAIN. CHK. WIRE CONNECTION, VACUUM HOSES, AIR INTAKE, SENSORS CONNECTION, WIRE SHAKE TEST. WISH I HAD CAM'S MACHINE FROM BACK WHEN WORKED DEALER SHIP DAYS. BUT I DON'T SO I WORK WITH I GOT.
WOULD 02 SENSORS STOP INJECTORS ???
DON'T ALL DATA ANY MORE.
DON'T HAVE MY BOOKS USING ENTER NET FOR DIAGRAMS.
LOOKING TO FIND Y PIPE TO REPLACE AT A GOOD PRICE.
THEN 02 SENSORS.
WOULD EXHAUST LEAK STOP INJECTOR ???
WOULD BAD DRIVERS IN COMPUTER INTERMITTENT INJECTORS???
WOULD BAD GROUNDS INTERMITTENT INJECTORS???
HAVE TO WORK ON / OFF AFTER WORK AND WEATHER CONDITIONS.
MY FOCUS INJECTORS FULL OPERATION. MY BE COMPUTER FLASH ONLY AFTER A GOOD WIRING HARNESS INSPECT AND GROUNDS CHK. PAINTED METAL SURFACES.
Expert:  Chris (aka- Moose) replied 3 months ago.

The all caps message is making it to hard for me to focus on all you have written. I will opt out and let another see if they can assist.

Expert:  Tool Hut replied 3 months ago.

Hi, My Name is ***** ***** for posting your question to just answer. I am a independent contractor for just answer. ASE Certified Master Auto Technician with 20 years experience. I am confident we can resolve your problem together.Please remember I don't know your skill level. I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies to get to a satisfactory resolution.There will probably be some equipment needed for a proper diagnosis. If you are not comfortable with this or do not have any test equipment please let me know ASAP. I also give you all of the information you may need in good faith expecting a positive rating. I am not compensated for my time until you leave a positive rating. Your rating should be based on the service you received.

I am confused. Why are you concerned with injector function? I say we focus on P0420 and P0430 and see what happens from here. Can you monitor B1S1 O2 sensor data? and B2 S2 sensor data? please graph if possible and send a idling after engine warm screenshot.

Customer: replied 3 months ago.
HEY TOOL MY SKILL LEVEL HAD ASE ALL 1 SHORT OF MASTER NEEDED TRANS MISSION NOW DO TRANSMISSION ASE ERPIRED 2013,14,..STILL HAVE EVT CERTIFIED TELL 8/17. FABRICATE & MODIFIED IN CARS AND TRUCK MOTORCYCLE, POLICE, FIRE, RESCUE, HEAVY EQUIP. CAN NOT GRAPH 02 ONLY READ NUMBERS VOLTS AND %. VOLTAGE VARY LOWS TO MED. TO HIGH
NOT LAZY NUMBERS HOLDING. HAVE YOU READ PRIOR NOTES OF CONDITIONS.
LOOKING INTO REPLACING EXHAUST "Y" PIPE OR INTERMEDIATE PIPE DAMAGE TO SCREEN AND RUBBER. THEN 02 SENSORS IF NOT FOR SLOW READINGS FOR AGE OR TIME. WILL BE TESTING CHK. HARNESS WIGGLE TEST. HAVE MULTI METER, LED TEST LIGHT, ENTER NET, HAVE TO GO BACK TO WORK. I'M OFF BY 3PM. THANK YOU
Expert:  Tool Hut replied 2 months ago.

Sorry all caps will not work for me. I will opt out

Customer: replied 2 months ago.
WHAT ARE OR IS "CAPS"??
Expert:  Tool Hut replied 2 months ago.

look at your words typed. They are all capital letters. very difficult to read

Customer: replied 2 months ago.
ok very late tomorrow will recap my data good night. thanks
Expert:  john aka eauto replied 2 months ago.

are the converters melted down? has a back pressure test been performed?

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