CNG Fuel Level Reads Higher Than Actual, Inaccurate Fuel Level Reading, MIL Illuminated (Reprogram PCM)
| Subject: | CNG Fuel Level Reads Higher Than Actual, Inaccurate Fuel Level Reading, MIL Illuminated (Reprogram PCM) |
| Models: | 2003 Chevrolet Express |
| 2003 GMC Savana |
| with CNG option (RPO KL6, KL8) |
Condition
Some customers may comment on the CNG fuel gage reading higher than actual or running out of CNG fuel when the gage reads above empty. In some instances, customers may also comment on the MIL illuminating. Upon investigation, the technician may find either a fuel or misfire related DTC. Diagnostics fail to resolve the DTC issue.
Correction
Reprogram the PCM with calibration operating system P/N 52372987 or later.
The new calibration will be released beginning with TIS satellite data update version 4.0 for 2004, which includes TECH2® update version 24.001, available April 2004. As always, make sure your TECH2® is updated with the latest software version.
Warranty Information
For vehicles repaired under the applicable 8 year/ 80,000 mile (130,000 km) (up to 8500 GVW) or 5 year/50,000 mile (80,000 km) (over 8500 GVW) emission controller warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
J6353 | Module, Powertrain Control - Reprogram | 0.4 hr |
