TSB's: Engine

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sperry:
Higher Than Expected Engine Oil Consumption (Replace PCV Valve) #01-06-01-029B - (Jul 19, 2002)

2002 Chevrolet Avalanche

1999-2002 Chevrolet Silverado, Suburban, Tahoe Models

2002 Cadillac Escalade, Escalade EXT

1999-2002 GMC Denali, Sierra, Suburban, Yukon Models

with 4.8L, 5.3L or 6.0L Engine (VINs V, T, N, U -- RPOs LR4, LM7, LQ9, LQ4)

This bulletin is being revised to clarify the parts information. Please discard Corporate Bulletin Number  01-06-01-029A (Section 06 -- Engine/Propulsion System).

Condition

Some customers may comment on higher than expected engine oil consumption. They may further comment on consumption in the range of 3,200 km (2,000 mi) or less per quart (0.946 liter) of oil under normal driving conditions.

Cause

The condition may be due to the positive crankcase ventilation (PCV) valve flow rate under certain engine operating conditions.

Correction

   1. Verify that the oil consumption is not the result of an oil leak or other engine concern.
   2. The dealer should perform an oil consumption test. The vehicle should have accumulated over 6,450 km (4,000 mi) before establishing the oil consumption rate. Reference Corporate Bulletin Number 01-06-01-011, Information on Engine Oil Consumption Guideline, for details.
   3. Remove the PCV valve and inspect the hose going to the intake manifold for signs of excessive oil being present.
   4. If excessive oil is present in the PCV hose, replace the PCV valve (Type 948C) (2) with a new-style fixed orifice PCV valve, GM P/N 12572717(1). See the illustration below.

     FIGURE PCV Valve Identification(c)



      (1)   New style fixed orifice PCV Valve
      (2)   Spring and plunger style PCV Valve (Type 948-C)

Important
The new style fixed orifice PCV valve contains no moving parts, and does not rattle when shaken.

If the vehicle has an orifice style PCV valve, investigate other causes for high oil consumption.

Parts Information:

Part Number      Description      Qty
-----------------      -------------      ----
12572717         Valve, PCV         1

sperry:
Check Engine Light On with No Driveability Concerns, DTC P0120, P0220, P1516, P1518 (Clear Code) #03-06-04-032 - (Jun 16, 2003)

2003 Cadillac Escalade, Escalade EXT, Escalade ESV

2003 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2003 GMC Sierra, Yukon, Yukon XL

with 4.8L, 5.3L or 6.0L Engine (VINs V, P, T, Z, N, U - RPOs LR4, LM4, LM7, L59, LQ9, LQ4,)

Condition

Some owners may comment that the Check Engine Light is illuminated and there is no driveability concern. Upon investigation, the technician may find codes P0120, P0220, P1516 or P1518. Also, technicians may note that low voltage codes P0562, P0563, P1637 or P1638 have been set.

Cause

The Tach module may set the code in error if it operates at a battery voltage of 4.5 to 5.0 volts.

Correction

If the vehicle has stored one of the low voltage codes, P0562, P0563, P1637 or P1638, follow the appropriate diagnostics for the low voltage code. In most cases, this will lead to correcting the concern without replacing any Electronic Throttle Control (ETC) components.

If codes P0120, P0220, P1516 or P1518 are present without any of the low voltage codes, the technician should observe the Engine RPM in the fault record.

    * If the Engine RPM in the fault record is zero and the customer indicates that the vehicles has experienced a low voltage condition, the code should be cleared and the low voltage should be diagnosed and corrected.
    * If the Engine RPM is zero and the customer indicates that there have been no low voltage conditions, then the P1516 diagnostic aids for intermittent concerns should be used to diagnose and correct the vehicle
    * If the Engine RPM is greater than zero, then check for an obvious loose ground at G103 located next to the right cylinder head just below the head and mounted into the block. Also, check G104 located behind the left cylinder head. Then verify all electrical connections at the TAC module.

If the concern is still not resolved, contact Technical Assistance.

sperry:
SES Light On with TAC Module Codes P1516 and Possible Codes P1514 P1515 P1518 - 4.8 5.3 6.0 actuator clearance cold contact distort DTC intermittent pedal position power sensor temperature throttle #PI00827C - (Oct 22, 2003)

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Condition/Concern:

SES light accompanied by DTC P1516, and / or reduced engine power. ( other DTCs may be present as well )

Recommendation/Instructions:

After following all published diagnostics the following should be performed:

For C/K trucks and utilities: Check for an obvious loose ground at G103 located next to the right cylinder head (passenger side) just below the head and mounted into the block. The ground uses a 13 mm bolt head mounted vertically to the right rear of the engine block just above the bell housing. G104 located behind the left cylinder head has also been found to cause this concern.

For S/T Utilities equipped with the 5.3 LM4: Check for an obvious loose ground at G108 located on the lower left side of the engine block. Verify all electrical connections especially right at the TAC module. There have been reports of the plastic retaining tab in the connector missing causing poor contact especially on rough roads.

Please be aware that a low battery condition may cause any of these codes to set.

If conditions described above are not observed, replace throttle body assembly P/N 12570800. Torque the throttle body mounting nuts per SI in a two step process: 45 lb / inches on the 1st pass, and then 89 lb / inches on the final pass.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

Models:

(03 GMT 370, Trailblazer/Envoy) and (03 Cadillac, Escalade, C6) and (03 Cadillac, EXT, C1) and (03 Chevrolet, Avalanche, K1, K2) and (03 Chevrolet Silverado Truck C1,C2,C3) and (03 Chevrolet Silverado Truck K1,K2,K3) and (03 GMC Sierra Truck C1,C2,C3) and (03 GMC Sierra Truck K1,K2,K3) and (03 CHEVROLET, TAHOE, C1) and (03 CHEVROLET, TAHOE, K1) and (03 CHEVROLET, SUBURBAN, C1,C2) and (03 CHEVROLET, SUBURBAN, K1,K2) and (03 GMC, YUKON, C1) and (03 GMC, YUKON, K1) and (03 GMC, YUKON XL, C1,C2) and (03 GMC, YUKON XL, K1,K2) and (03 GMC, YUKON DENALI, AWD)

sperry:
Cranks But No Start, Stall, Inaccurate/Incorrect Fuel Gauge Reading, No Fuel, Vehicle is Out of Fuel and Fuel Gauge Reads Above Empty (Replace Fuel Level Sensor) #04-08-49-018E - (Jan 5, 2005)

2001-2004 Cadillac Trucks

1999-2004 Chevrolet and GMC Trucks

2004-2005 HUMMER H2

with Gasoline Engine (VINs Z, X, V, T, U, N, G,6, 8 -- RPOs LU3, LR4, LM7, LQ4, LQ9, L59, L18,LK5 , L52 )

Parts are currently available for vehicles with Variable Fuel (VIN Z -- RPO L59) vehicles. Please refer to Corporate Bulletin Number 04-06-04-012B or newer for Variable Fuel (VIN Z -- RPO L59) vehicles.

This bulletin is being revised to include information on the Chevrolet Colorado and the GMC Canyon. Please discard Corporate Bulletin Number 04-08-49-018 D (Section 08 - Body and Accessories).

Condition

Some customers may comment on the vehicle stalling and will not restart, vehicle ran out of fuel, vehicle appears to be out of fuel but the fuel gauge reads above empty. The fuel gauge may read 1/4 tank.

Cause

Contamination on the fuel sending card may cause inaccurate/incorrect fuel gauge readings.

Correction

Follow the service procedure below for diagnosis and repair of this concern.

   1. Confirm that the vehicle is actually out of fuel.
         -    If the vehicle is not out of fuel but Engine Cranks but Does Not Run, refer to the appropriate Service Information.
         -    If the vehicle is out of fuel and the gauge does not read empty, test the fuel gauge. Refer to the following information:
                   Fuel Gage Inaccurate or Inoperative Single Tank (SI Document ID #850196)
                   Fuel Gage Inaccurate or Inoperative Dual Tanks (SI Document ID #850195)
   2. If testing reveals that the fuel gauge is operating correctly, replace the fuel sensor assembly and auxiliary tank fuel level sensor if equipped.
   3. Replace the fuel level sensor. Refer to the following appropriate service information:
         -    Fuel Level Sensor Replacement 4.8L and 5.3L Engines (SI Document ID #1332662)
         -    Fuel Level Sensor Replacement 6.0L Engine - Front Tank (SI Document ID #1333086)
         -    Fuel Level Sensor Replacement 8.1L vehicles with Front Tank (SI Document ID #1333104)
         -    Fuel Level Sensor Replacement 8.1 L vehicles with Rear Tank (SI Document ID #1333105)

Parts Information

Note: Provide the VIN of the vehicle for confirmation of the part number.

89060640,  Sensor Assembly, Main Tank, Side 1999-2003

100200300 034353, C/K, 2 Dr, 4 Dr and Ext Cab Pickup

with LU3 or LR4 or LM7 or LQ4 or LQ9 or L18 and -- K53 (without robust fuel system)
----------------------
2004

100 0353, C/K, 2 Dr and Ext Cab

with LU3 and without K53 (robust fuel system)

sperry:
97-05 Vehicles with 4.8 5.3 5.7 and 6.0 Gen III V8 Engines and Misfires on One Bank - kw CEL diagnostics driveability DTC P0171 P0172 P0174 P0175 P0300 P0301 P0302 P0303 P0304 P0305 P0306 P0307 P0308 #PIP3056 - (Jul 12, 2004)

Condition/Concern:

Check Engine Light with a P0300 due to 2 - 4 cylinders misfiring on the same bank of the engine. DTCs P0171, P0172, P0174 or P0175 may also set for the misfiring bank.

Recommendation/Instructions:

If the published misfire diagnostic does not isolate the cause, perform the following suggestions as necessary:

   1. Perform a fuel injector balance test for all 8 cylinders. If a fuel injector concern exists, it is possible to misfuel an entire bank of the engine, causing multiple cylinders on the same bank to misfire even though the root cause is a single fuel injector.
   2. Inspect O2 sensor connections on the misfiring bank for corrosion or water intrusion. If water intrusion is found on the right bank, it may be due to the AC Evaporator Condensation dripping onto the O2 sensor harness. If this condition is found, reposition and shield the harness to prevent a repeat concern and repair the connections.
   3. Check for excessive exhaust backpressure using the restricted exhaust diagnosis from SI.
   4. Swap the Position 1 O2 sensors side to side to see if the misfires move to the other bank of the engine. If so, replace the O2 sensor.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

Models:

(00 - 05 Cadillac Escalade - C6 and K6) and (02 - 05 Chevrolet Avalanche - C1, C2 K1 and K2) and (99 - 05 Chevrolet Silverado - C1, C2 K1 and K2) and (00 - 05 Chevrolet Suburban - C1, C2, K1 and K2) and (00 - 05 Chevrolet Tahoe - C1 and K1) and (99 - 05 GMC Sierra C1, C2 K1 and K2) and (00 - 05 GMC Yukon - C1, C2, K1 and K2) and (03 - 05 Chevrolet Express G1, G2, G3, H1, H2 ) and (03 - 05 GMC Savana G1, G2, G3, H1, H2 ) and (04 - 05 Buick Rainier S1, T1 ) and (03 - 05 Chevrolet Trail Blazer EXT S1, T1 ) and (03 - 05 GMC Envoy XL XUV S1, T1 ) and (03 - 05 Hummer H2) and (04 - 05 Cadillac CTS-V DB) and (98 - 02 Chevrolet Camaro FB) and (97 - 04 Chevrolet Corvette YB) and (98 - 02 Pontiac Firebird FB) and (04 - 05 Pontiac GTO VB)

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