2005 LT Chevy Suburban

Tiny
TOM JACKSON
  • MEMBER
  • 2005 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 66,000 MILES
No related work has been done on this vehicle recently and no service engine light has appeared. The Tachometer stopped working first and now the speedometer sometimes registers much faster than actual speed. The only way to clear the new speed ( x plus actual) is to turn the ignition (a/c) on and off until zero mph is reached. Also when the air con is on, sometimes the drivers side will blow cold and the passengers side will blow warm. The only way to reset this condition is to turn off the vehicle for approx. 30 seconds
How do I fix these problems? Is it the in the dashboard? The brain?
Do you
have the same problem?
Yes
No
Wednesday, March 16th, 2011 AT 5:18 PM

6 Replies

Tiny
MERLIN2021
  • EXPERT
According to GMC this is what to do first: INSPECTION OF RELATED WIRING HARNESS CONNECTIONS WHEN DIAGNOSING
MISC. DTCS, INTERMITTENT DRIVEABILITY CONCERNS, HARD START, NO START,
INCORRECT GAUGES, INOP I/C SYSTEMS, SES/4WD LAMPS ILLUMINATED
TECHNICAL SERVICE BULLETIN
Reference Number(s): 03-06-04-012A, Date of Issue: August 10, 2005
Related Ref Number(s): 03-06-04-012, 03-06-04-012A
ARTICLE BEGINNING
SERVICE INFORMATION
When servicing a vehicle for any type of customer concern, the following steps are imperative.
Inspect and ensure the integrity of all related wiring harness connectors. If the wiring harness
connectors are not properly put together or engaged before they are locked together, numerous types
of intermittent conditions may occur, which may include any of the symptoms listed above and
possibly others.
The first step in any type of electrical diagnosis is a visual and physical inspection of the wiring
harness connectors for integrity. Many times, the vehicle may be repaired just by disconnecting and
reconnecting the connectors. As with all repairs to wiring harness connectors and terminals, a pull
test of the terminals within the connector should be performed. A pull test is performed by inserting
the proper size terminal test tool (not a paper clip) into the terminal to determine whether or not the
terminal is making good contact, or whether the terminal has been damaged from the prior improper
connection or lack of connection.
The J 35616-64A or B probe has been designed for these terminals that may be both a round or
square design.
For example, if the Connector C2 of the engine wiring harness to the Powertrain Control Module
(PCM), for the 2.2L equipped Cavalier or Sunfire is not properly seated into the PCM:
? The cam lock lever may close, however improperly.
? The cam lock lever may even snap out of position.
? The vehicle may have an intermittent condition with any one of the components which are
controlled or monitored by the PCM.
Press Ctrl+F to find exact text
Affected
Model(s):
2006 and Prior Cars and Light Duty Trucks 2003-2006 HUMMER H2 2006
HUMMER H3 2005-2006 Saab 9-7X
Supercedes:
This bulletin is being revised to add models, model years and additional information.
Please discard Corporate Bulletin Number 03-06-04-012 (Section 06 -
Engine/Propulsion System).
NOTE:
Most terminals used in current module connectors (ECM, BCM, EBTCM
and the like) are small 0.64 mm sq. Terminals and can be damaged by
probing with the wrong tool.
THE CAM LOCK LEVER IS DESIGNED TO PULL (OR ASSIST) THE CONNECTOR INTO ITS
FINAL POSITION ONCE IT HAS BEEN PRESSED STRAIGHT INTO THE PCM HEADER
PAST THE INITIAL DETENT, ALLOWING THE LEVER TO BE MOVED INTO THE LOCKED
POSITION. It is not only a retainer but an assist during the connection process. When the wiring
harness connector is properly connected to the PCM, a snap will be heard when the connector is in
position to be fully seated. The cam lock lever may then be closed. The cam lock lever will then do
its designated job as both an assist and ensuring the connector does not come apart due to vibration or
other types of conditions found in vehicles as they travel down the highway.
Remember, if a terminal (metal) or the connector (plastic) is damaged, they should be replaced. DO
NOT replace the complete wiring harness assembly. Some harnesses are now on order restriction
since most harness damage can be repaired.
Terminals and terminal removal tools are in the J 38125 Terminal Repair Kit and pigtails or complete
connectors can be obtained through normal parts ordering procedures OR from GMSPO and Saab
PDC along with tape or conduit.
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Wednesday, March 16th, 2011 AT 6:11 PM
Tiny
MERLIN2021
  • EXPERT
Also this one VERY IMPORTANT! For the full document post your email and I will send it.
Reference Number(s): 07187C, Date of Issue: March 20, 2009
Affected
Model(s):
2003-2004 CADILLAC ESCALADE, ESCALADE ESV, ESCALADE EXT; 2005
CADILLAC ESCALADE, ESCALADE ESV, ESCALADE EXT (U.S. ONLY);
2003-2004 CHEVROLET AVALANCHE, SILVERADO, SUBURBAN, TAHOE;
2005 CHEVROLET AVALANCHE, SILVERADO, SUBURBAN, TAHOE
(U.S. ONLY); 2003-2004 GMC SIERRA, YUKON, YUKON XL; 2005 GMC
SIERRA, YUKON, YUKON XL (U.S. ONLY)
Supercedes:
THIS BULLETIN IS BEING REVISED TO INCLUDE CERTAIN 2005 MODEL
YEAR VEHICLES IN THE U.S. ADDITIONALLY, FOR U.S. 2003-2005 MODEL
YEAR VEHICLES, GM WILL PROVIDE THE INSTRUMENT PANEL CLUSTER
(IPC) ONLY, AT NO CHARGE TO THE CUSTOMER FOR VERIFIED
FAILURES BETWEEN 70,001 MILES (110,001 KM) AND 80,000 MILES
(130,000 KM). ANY ADDITIONAL COSTS, INCLUDING LABOR TO REPLACE
THE INSTRUMENT PANEL CLUSTER, WILL BE THE RESPONSIBILITY OF
THE CUSTOMER. DEALERS WILL BE RESPONSIBLE FOR THE RETURN OF
THE CUSTOMER'S IPC BACK TO THE ELECTRONIC SERVICE CENTER.
PLEASE DISCARD ALL COPIES OF BULLETIN 07187B, ISSUED SEPTEMBER
2008.
Related Ref Number(s): 07187, 07187A, 07187B, 07187C
ARTICLE BEGINNING
SERVICE INFORMATION
CUSTOMERS ARE BEING INSTRUCTED TO CONTACT THE DEALERSHIP TO ARRANGE AN
APPOINTMENT IF THEY BELIEVE THEIR VEHICLE HAS THIS CONDITION. THE
CUSTOMER IS BEING ASKED TO PROVIDE THE VIN SO THE IPC CAN BE ORDERED IN
ADVANCE OF THE SCHEDULED APPOINTMENT. THIS WILL ELIMINATE THE NEED TO
KEEP THE VEHICLE OVERNIGHT. DEALERS ARE TO OBTAIN THE VEHICLE MILEAGE
WHEN SCHEDULING A SERVICE APPOINTMENT. THE VEHICLE MILEAGE WILL BE
REQUIRED WHEN PLACING AN ORDER FOR THE IPC.
CONDITION
Some customers of all 2003-2004 model year and certain U.S. 2005 model year Cadillac Escalade,
Escalade ESV, and Escalade EXT; Chevrolet Avalanche, Silverado, Suburban, and Tahoe; and
GMC Sierra, Yukon, and Yukon XL vehicles have reported that one or more of the instrument
panel (IP) cluster gauges stick, flutter, or become inoperative. This may cause inaccurate readings,
including the speedometer and fuel gauge.
SPECIAL COVERAGE ADJUSTMENT
This special coverage covers the condition described above for a period of 7 years or 70,000 miles
(110,000 km), whichever occurs first, from the date the vehicle was originally placed in service,
regardless of ownership.
Page 1 of 10
07187C - SPECIAL COVERAGE ADJUSTMENT - INSTRUMENT PANEL CLUSTER.
3/16/2011
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Wednesday, March 16th, 2011 AT 6:15 PM
Tiny
TOM JACKSON
  • MEMBER
How Do I post my email address for merlin2012. Thank you Tom J.
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Wednesday, March 16th, 2011 AT 6:25 PM
Tiny
MERLIN2021
  • EXPERT
Just type it in here. I see you have 66,000 mile so you are covered as long as you dont go past 70,000 miles get to checvy and get it fixed under warranty. READ my second bulletin.
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Wednesday, March 16th, 2011 AT 6:44 PM
Tiny
TOM JACKSON
  • MEMBER
Tom@icecreamclub. Com
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Wednesday, March 16th, 2011 AT 6:50 PM
Tiny
MERLIN2021
  • EXPERT
Check your email.
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Wednesday, March 16th, 2011 AT 8:58 PM

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