#PIP3089B: 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 - (Oct 31, 2006)
|Subject:||SES Light and Reduced Engine Power DTC P0120 P0220 P1516 P2135|
|Models:||2004-2006 Buick Rainer|
|2003-2006 Cadillac Escalade|
|2003-2006 Chevrolet Avalanche, Corvette, Express, Monte Carlo, Silverado, SSR, Suburban, Tahoe, Trailblazer|
|2003-2006 GMC Envoy, Savana, Sierra, Yukon|
|Equipped with a 4.8 5.3 6.0 or 7.0 V-8 Engine|
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
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.
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.
- 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.
- 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.
- 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.
#06-06-04-007: Diagnostic Information for LS2, LS4 and LH6 Engines for Diagnostic Trouble Codes (DTCs) P0606, P0689, P1516, P1682 and/or P2176 that may have Set Due to Low Battery Voltage Condition - (Feb 2, 2006)
|Subject:||Diagnostic Information for LS2, LS4 and LH6 Engines for Diagnostic Trouble Codes (DTCs) P0606, P0689, P1516, P1682 and/or P2176 That May Have Set Due to Low Battery Voltage Condition|
|Models:||2005-2006 Buick Rainier|
|2005-2006 Chevrolet Impala SS, Monte Carlo SS, SSR, Trailblazer SS|
|2005-2006 GMC Envoy Denali, Envoy XL Denali|
|2005-2006 Pontiac Grand Prix, GTO|
|with 5.3L or 6.0L V8 Engine (VINs C, M, H, U -- RPOs LS4, LH6, LS2)|
This bulletin is being published to aid technicians in the diagnosis of the following DTCs:
| • ||P0606 -- Control Module Internal Performance|
| • ||P0689 -- Engine Controls Ignition Relay Feedback Circuit Low Voltage|
| • ||P1516 -- Throttle Actuator Control (TAC) Module Actuator Position Performance|
| • ||P1682 -- Ignition 1 Switch Circuit 2|
| • ||P2176 -- Minimum Throttle Position Not Learned|
The above DTCs may have set under a low battery voltage condition during or prior to vehicle cranking, then starting. If these codes are present, and a low battery condition exists or the customer indicates that the vehicle has experienced a low battery voltage condition, the technician should do the following:
- With a Tech 2®, observe the engine RPM and the control module voltage in freeze frame and failure records for the DTC(s) set. If the engine RPM is zero or lower than idle speed and the control module voltage indicates less than 9 volts, this may indicate a low battery condition had occurred to cause these codes to set. The low battery condition should be diagnosed and corrected. Refer to SI for Battery Inspection/Test and/or Charging System Test.
- If the battery voltage is within the normal operating range, refer to the DTC(s) set in SI for further diagnosis.
- After the low voltage concern has been identified and addressed, clear the codes. Do not replace the ECM for this concern or replace and ECM with any of the following part numbers: