Engine Controls - MIL ON/DTC's P0420/P0430 Set
TECHNICALBulletin No.: 09-06-04-011A
Date: April 03, 2009
Subject:
Malfunction Indicator Lamp (MIL) Illuminated, DTCs P0420 and/or P0430 Set (Reprogram Engine Control Module (ECM))
Models:
2007-2008 Chevrolet Corvette ZO6
2009 Chevrolet Corvette ZO6 Built Prior to VIN Breakpoint 95112736
with 7.0L Engine - RPO LS7
Please Refer to GMVIS
Supercede:
This bulletin is being revised to update the reprogramming emission controller warranty information statement and to change the labor operation. Please discard Corporate Bulletin Number 09-06-04-011 (Section 06 - Engine Controls)
Condition
Some customers may comment that the MIL is illuminated.
Technicians may find DTCs P0420 and/or P0430 set as current or in history.
Cause
This condition may be caused by the ECM determining that either/both of the catalytic converters are exhibiting low efficiency under certain vehicle operating conditions.
Correction
Important
DO NOT replace the catalytic converters for this condition.
A revised calibration has been released to address this condition. Follow the published SI diagnostics for DTC P0420 or P0430 and repair if necessary. If the SI diagnostics do not isolate a cause for this condition, reprogram the ECM using the Service Programming System (SPS) with the latest calibration available on TIS2WEB. Refer to the SPS procedures in SI.
When using a multiple diagnostic interface (MDI) for reprogramming, ensure that it is updated with the latest software version.
When using a Tech 2(R) for reprogramming, ensure that it is updated with the latest software version.
During programming, the battery voltage must be maintained within the proper range of 12-15 volts. Only use the approved Midtronics(R) PSC 550 Battery Maintainer (SPS Programming Support Tool EL-49642) or equivalent during programming.
Warranty Information
For vehicles reprogrammed under the 8 year / 80,000 mile (130,000 km) emission controller warranty, use the table above.
Disclaimer