MIL is On, Engine Stumble/Hard Start/Stall, History DTCs

File In Section: 6E - Engine Fuel & Emission

Bulletin No.: 67-65-39

Date: January, 1997

Subject:
Intermittent Malfunction Indicator Lamp (MIL) with DTCs P0251, P0370, P1216 and Stumble, Stall, Hard Start (Check Fuel Tank Level)

Models:
1996-97 Chevrolet and GMC C/K, G, P Models
1996-97 AM General Hummer
1996-97 Reumech A-Wagon
with 6.5L Diesel Engine (VINs F, S - RPOs L65, L56)

Condition

Some owners may experience an intermittent Malfunction indicator Lamp (MIL) associated with history DTC's P0251, P0370, P1216. Also, owners may experience a stumble, hard start or stall. It is possible that the technician may not be able to duplicate the driveability concern but will notice history DTCs on the Tech 2 scanner.

Cause

Air entering the fuel system when fuel levels get below 1/8 of a tank during hard acceleration or turning maneuvers.

Correction

Check fuel tank level, if necessary fill tank to at least 1/2 full and purge air from fuel system using procedure in Service Manual. Erase DTCs on Tech 2 scanner. Additionally, inform customer of conditions associated with low fuel levels indicated in the Diesel Supplement Owner's Manual.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation Description Labor Time
L1005 Fuel System 0.4 hr
Air Bleed Diesel