Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003EXPRESS 1/2 TON VAN V6-4.3L VIN XREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSENGINE CONTROLS - FALSE START/MIL ON/DTC P0191 SET
2003 Chevrolet Express 1/2 Ton Van V6-4.3L VIN X
Engine Controls - False Start/MIL ON/DTC P0191 Set
2003 Chevrolet Express 1/2 Ton Van V6-4.3L VIN XSECTION Engine Controls - False Start/MIL ON/DTC P0191 Set
Bulletin No.: 04-06-04-049
Date: June 30, 2004
TECHNICAL
Subject:
False Start with MIL Light On, P0191 (Reprogram PCM)
Models:
2003 Chevrolet Express
2003 GMC Savana
with CNG Option (RPO KL6, KL8)
Condition
Some customers may comment that their vehicle had a false start or start/stall with the MIL being illuminated. Some customers may not be able to start the vehicle. Upon investigation, the technician may find a DTC P0191.
Correction
Reprogram the PCM with calibration operating system part number 52372987 or later.
The new calibration will be released beginning with TIS satellite data update version 4.0 for 2004, which includes TECH2(R) update version 24.001, available April 2004. As always, make sure your TECH2(R) is updated with the latest software version.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer
Date: June 30, 2004
TECHNICAL
Subject:
False Start with MIL Light On, P0191 (Reprogram PCM)
Models:
2003 Chevrolet Express
2003 GMC Savana
with CNG Option (RPO KL6, KL8)
Condition
Some customers may comment that their vehicle had a false start or start/stall with the MIL being illuminated. Some customers may not be able to start the vehicle. Upon investigation, the technician may find a DTC P0191.
Correction
Reprogram the PCM with calibration operating system part number 52372987 or later.
The new calibration will be released beginning with TIS satellite data update version 4.0 for 2004, which includes TECH2(R) update version 24.001, available April 2004. As always, make sure your TECH2(R) is updated with the latest software version.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.