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Tim's Auto Repair
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2003 CHEVY 2500HD 6.0 NO RESPONSE TO THROTTLE PEDAL,REDUCED

This answer was rated:

2003 CHEVY 2500HD 6.0 NO RESPONSE TO THROTTLE PEDAL,REDUCED POWER AND MIL ARE ON,CODES ARE P0120,P0220,P0758,P1516,P1518,P1860
ANY SUGGESTIONS

hi

please check the wire plug at the throttle body...make sure you have a good connection

thanks

 

Subject: SES Light And Reduced Engine Power DTC P0120 P0220 P1516 P2135 - keywords accelerator actuator APP blade body connector connection DTC L33 L59 LH6 LR4 LM7 LS1 LS2 LQ4 LQ9 module position reduce sensor #PIP3089B - (10/31/2006)

Models:

2004-2006 Buick Rainer

2005-2006 Cadillac CTS-V

2003-2006 Cadillac Escalade

2003-2006 Chevrolet Avalanche, Corvette, Express, Monte Carlo, Silverado, SSR, Suburban, Tahoe, Trailblazer

2003-2006 GMC Envoy, Savana, Sierra, Yukon

2003-2006 Hummer H2

2005-2006 Pontiac GTO

Equipped with a 4.8 5.3 6.0 or 7.0 V-8 Engine


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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:

A vehicle may be brought into the dealer for a reduced power message, and DTCs P0120, P0220, P1516, P2101, or P2135.

The Throttle Actuator Control (TAC) / throttle body type trouble codes, may be caused by a loose wiring crimp at the throttle body connector, or a broken throttle body circuit.

Recommendation/Instructions:

Complete the current SI diagnostics for any symptoms or trouble codes found. If a intermittent T/P or TAC module type code is occurring complete the inspections below.

  1. Inspect all related throttle body terminals for a loose wiring crimp. The loose crimp may be difficult to find, and the poor connection will be between the terminal and the copper strands of the wire. Wiggle test the individual throttle body circuits to see if the concern can be duplicated.
  2. Inspect the related circuits for broken wires inside the insulation. The outer wire insulation may look fine, but the internal copper strands may be partially broken. Breaks in the wires usually occur within 1 to 4 inches of the throttle body connector. Wiggle testing may also induce a trouble code to set.
  3. On C/K trucks complete SI procedures for voltage drop on grounds G103 and G104. Grounds G103 or G104 may be loose or corroded.

If a terminal crimp or a broken wire has been found, repair or replace only the circuits involved. There is a throttle body pigtail connector available through GMSPO, but installing this pigtail connector may cause other intermittent TAC module/TP codes at a later date. If this pigtail must be used, please follow the SI procedures for Splicing Copper Wire Using Splice Sleeves. (the proper Kent-Moore crimping tool must be used for this repair)

Please follow this diagnostic or repair 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.

 

 

Customer: replied 6 years ago.
are grounds g103 and g104 the two on the firewall

hi

 

Engine Harness Views
Locations
icon_note_blank.gif Notes Engine Harness - Back Of The Engine

G104 And G105

Battery Views
Locations
icon_note_blank.gif Notes

Customer: replied 6 years ago.
also the engine keeps running for about 20 seconds after ignition switch is turned off

ok

when you get this fixed..it may take care of this..it sounds as if you are getting a power backfeed...

thanks

Tim's Auto Repair and other Chevy Specialists are ready to help you
Customer: replied 6 years ago.

unfortunately the suggestions I was provided had no effect and I discovered turning on the high beams kills the engine.

can you think of any other solutions

ok

load test the charging system..the alternator may be weak...if you don't have a load tester,,auto zone and most parts stores will do this for free

thanks