C 1500 Truck 2WD V8-5.3L VIN T (1999)
Engine Control Module: Customer Interest
Engine Controls - EGR Codes P0404 and P1404
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 99-06-04-011
Date: March, 1999
TECHNICAL
Subject:
EGR Codes PO4O4 and P14O4, Oil Level Light Remains On After Oil Change or 011 Has Been Added (Reprogram PCM)
Models:
1999 Chevrolet and GMC C/K Models (Silverado and Sierra)
with 5.3L V8 Engine (VIN T - RPO LM7)
and 4L6O-E Automatic Transmission (RPO M30)
Built Prior to the VIN Breakpoints as shown.
Condition
^
Some customers may comment on a Malfunction Indicator Lamp (MIL) illuminating in cold weather. A Diagnostic Trouble Code (DTC) P0404 or
P1404 is stored in the Vehicle Control Module.
^
Some customers may also comment of an Oil Level Light illuminating and remaining illuminated during or soon after either an oil change or adding
oil.
Cause
^
EGR DTC Concern: Rapid cycling of the EGR Valve at ambient temperatures between 1° and 4°C (34° and 39°F).
^
Oil Level Light Concern: The Oil Level Light may be illuminated, even though the oil level is correct as measured on the dipstick. This condition
may occur if the ignition key is turned on during, or very soon after, an engine oil change or engine oil has been added.
Correction
^
For the EGR DTC Concern:
Perform the existing diagnostic procedures to verify that the DTC's P0404 and/or P1404 are not the result of an EGR failure, or of a related
wiring/other concern. Engines determined to have EGR faults should be repaired, and then have the PCM Reprogrammed only if the new calibration
was not previously installed. If the DTC's occur and no EGR fault is found, reprogramming the PCM with the new calibration will be required.
^
For Oil Level Light On:
Reprogramming the PCM with the new calibration will be required.
Calibrations
