Engine Controls - SES Lamp ON/DTC's P0135/P0155

Bulletin No.: 04-06-04-005

Date: January 22, 2004

TECHNICAL

Subject:
Service Engine Soon Light Illuminated with DTC P0135 or P0155 (Reprogram PCM)

Models:
2001 Chevrolet Express
2001 GMC Savana
with 4.3L V-6 Engine (VIN W - RPO L35)
and California Emissions (RPO NC1)

Condition

Some owners may comment on a Service Engine Soon (SES) Light/Message displayed. Upon investigation, the technician may find DTC P0135 or P0155 stored. Diagnosis may not identify the exact cause and the DTC(s) may not be duplicated.

Correction

If a vehicle is encountered with the condition described above and all of the diagnostic procedures listed in the applicable Service Manual have been performed with no resulting correction, use a Tech II scan tool to verify which software calibration is programmed into the vehicle's PCM. If the improved calibration, to enhance heated oxygen sensor diagnostics, has not been installed, reprogram the PCM with the updated calibration released on Techline TIS 2000 version 11 for 2003 that was sent to dealers in October 2003.

Warranty Information





For vehicles repaired under 8 years/80,000 mile emission warranty, use the table.





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