This code pops up all the time..I clear it and then it comes back right upon start about 95% of the time...I used google and it says "open circut , faulty relay , failed ignition" Is this bad for ECM what are the affects of it etc? The truck starts and runs fine. I did read that maybe if the battery is weak it coud throw the code also but I read 14v while driving and at idle although at startup it is below 12v on the gauge...Any ideas??

 

Found this:
Maybe it's from the point to where I turn the key and it's saying less than 12v then setting it thus typically occuring during start up..Also sometimes the engine will surge and the rpms will drop along with voltage..The battery is good though..hmmmm

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 Chevrolet Corvette

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

2005-2006 Saab 9-7X

with 5.3L or 6.0L V8 Engine (VINs C, M, H, U -- RPOs LS4, LH6, LS2)




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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:
• 12597883

• 12596679

• 12597191