LD8, L37 Service Engine Soon (SES) Light Illuminated or Traction Disabled Message Displayed After Extended Idle, Multiple PCM DTCs P0171, P0174, P0420, P1516, P1682, P2101, P2176 (Reprogram PCM)
| Subject: | LD8, L37 Service Engine Soon (SES) Light Illuminated or Traction Disabled Message Displayed After Extended Idle, Multiple Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs) -- P0171, P0174, P0420, P1516, P1682, P2101, P2176 (Reprogram PCM) |
| Models: | 2006 Buick Lucerne -- Built Prior to VIN Breakpoint 6U211174 |
| 2006 Cadillac DTS -- Built Prior to VIN Breakpoint 6U211176 |
| with 4.6L Northstar® V8 Engine (VINs Y, 9 -- RPOs LD8, L37) |
Condition
Some customers with vehicles built prior to the above VIN breakpoints may comment on any of the following conditions:
| • | An SES light illuminated or a "Traction Disabled" message displayed after a extended idle of 30 minutes or more. After further investigation, technicians may find DTC P0171 and/or P0174. |
| • | An SES light illuminated . After further investigation, technicians may find DTC P0420. |
| • | An SES light illuminated . After further investigation, technicians may find DTC P1682 along with P1516, P2101 or P2176. |
Correction
Reprogram the PCM with the latest TIS calibrations if the above concern is encountered. An updated PCM calibration is now available to address this concern. This calibration, or any that follow, is designed to address this concern. Refer to Service Programming Systems (SPS) using the appropriate Service Information (SI) procedures. This latest calibration also contains diagnostic enhancements for the "Traction Disabled" message displayed after an extended idle.
| • | If P0171 or P0174 is present, check for vacuum leaks. If vacuum leaks are present, P0171 or P0174 will continue to set. |
| • | If P0420 is present, refer to DTC P0420 diagnostic "Repair Verification" in SI after reprogramming to determine if the catalyst is "Good" or "Bad". Do not replace the catalytic converter unless DTC P0420 does not pass with the new calibration. |
The new PCM calibration is available to dealerships as part of TIS2000 incremental satellite update data version 4.0 for 2006 or later, broadcast to dealers on April 3, 2006; and on TIS CD-ROM version 4.0/2006 or later, mailed to dealers beginning April 12, 2006. As always, make sure your Tech 2® is updated with the latest software version.
Warranty Information
For vehicles repaired under the 8 year/80,000 mile emission controller warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
J6353* | Module, Powertrain Control - Engine Reprogramming with SPS | 0.4 hr |
*This labor operation is for bulletin use only. It will not be published in the Labor Time Guide. | ||
