Engine Controls - MIL ON/DTC P0461 Set

TECHNICAL

Bulletin No.: 09-06-04-021A

Date: April 28, 2009

Subject: Malfunction Indicator Lamp (MIL) Illuminated, DTC P0461, Fuel Gauge Indicates Empty (Reprogram Engine Control Module (ECM))

Models:
2009 Cadillac Escalade Models
2009 Chevrolet Avalanche, Suburban, Tahoe
2009 GMC Yukon Models
2009 HUMMER H2
Equipped with Engine RPOs - LMG, L9H, LC9
Please Refer to GMVIS


Supercede:
This bulletin is being revised to remove the GMC Sierra from the model information. Please discard Corporate Bulletin Number 09-06-04-021 (Section 06 - Engine/Propulsion System).


Condition

Some customers may comment that the MIL is illuminated.

Some customers may comment that during an extended drive (approximately 240 km (150 mi), the fuel gauge will indicate empty.

Technicians may find DTC P0461 set.

Cause

This condition may be caused by a calibration within the ECM that is too sensitive, when it compares the vehicle speed and mileage driven to the expected fuel consumption, and then processes that information into the expected fuel level changes.

Correction

Important
DO NOT drain and refill the fuel tank, replace the ECM, fuel level sensor, or the fuel pump module for this condition.

A revised calibration has been released to address this condition. Technicians are to 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 repaired under the 8 year/80,000 mile (130,000 km) emission controller warranty, use the table shown above.





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