Diesel Engine - Low Power/MIL ON/DTC P0101
TECHNICALBulletin No.: 08-06-04-054B
Date: January 24, 2011
Subject: Snow or Ice Ingestion into Air Cleaner Element, Malfunction Indicator Lamp (MIL) Illuminated, Engine Power is Reduced Message Displayed, DTC P0101 Set (Perform Repair as Outlined)
Models:
2007-2010 Chevrolet Silverado 2500/3500 Series
2007-2010 GMC Sierra 2500/3500 Series
Equipped with Duramax(TM) Diesel Engine (RPO LMM)
Supercede:
This bulletin is being revised to provide a procedure to relocate the OAT sensor, if equipped with RPO CJ2. Please discard Corporate Bulletin 08-06-04-054A (Section 06 - Engine / Propulsion System).
Condition
Some customers may comment on the malfunction indicator lamp (MIL) being illuminated and an Engine Power is Reduced message being displayed.
The technician may observe DTC P0101 set as current or in history.
Cause
This condition may be caused by snow being ingested into the air cleaner housing and accumulating in the air cleaner element, resulting in restricted airflow into the engine.
Correction
1. Verify the condition by questioning the customer as to when the condition occurs (such as during or right after a snow storm).
• If the condition occurs as described above, proceed to Step 2.
• If the condition does not occur as described above, refer to Diagnostic Trouble Code (DTC) List Vehicle in SI.
2. Remove the air cleaner element. Refer to Air Cleaner Element Replacement in SI.
3. Inspect the air cleaner element for the following conditions:
1. Packed snow
2. Frozen ice
3. A soaking wet condition that would indicate previous snow ingestion
4. Excessive debris and contamination as a result of the ingestion
• If any of the above conditions are observed, replace the air cleaner element. Remove any snow or ice that may have accumulated in the air intake duct.
Note
Winter covers for trucks that are equipped with the Duramax(TM) Diesel Engine are included with vehicle orders that ship to the following areas: All of Canada, and the following states: Alaska, Colorado, Idaho, Maine, Michigan, Minnesota, Montana, New Hampshire, New York, North Dakota, South Dakota, Vermont, Wisconsin, Wyoming. These vehicles should not need a new cover.
4. Install the grille opening section ONLY (if using the 2 piece cover) of the winter front cover following the usage guidelines provided in the Owners Manual for the appropriate type winter cover.
• If the customer does not have a cover, obtain and install the grille opening section ONLY , GM P/N 25822811 (GMC) or GM P/N 25822812 (Chevrolet).
5. The grille opening cover MUST BE installed to ensure a complete repair, BEFORE ENCOUNTERING SNOW. This repair allows warm air to be circulated into the air cleaner.
Additional Information to Advise Customer
Important
If the vehicle is driven in a snow storm before installing the winter cover and the customer chooses to resolve the issue, they must follow this procedure using the following steps:
1. Remove ANY ice or snow that may have accumulated in the air intake duct, BEFORE REPLACING the air cleaner element.
2. INSTALL the winter cover BEFORE continuing to drive the truck.
3. Turn OFF the ignition, and all electrical accessories and components.
4. Remove the key from the vehicle, THEN open and close the door.
5. WAIT for 2 minutes to allow the engine control module (ECM) to power down.
This can be verified by watching for the instrument panel cluster (IPC) gage needles to drop slightly.
1. Allowing the ECM to power down will let DTC P0101 revert to a History DTC and the vehicle should return to full power if the issue has been eliminated.
2. Advise the customer to take the vehicle to the dealer as soon as possible to verify the condition has been eliminated.
Ambient (Outside) Air Temperature Sensor Relocation
For vehicles equipped with Automatic Temperature Control HVAC (RPO CJ2), the ambient (outside) air temperature sensor needs to be relocated using the following procedure:
1. Remove the radiator grille. Refer to the Radiator Grille Replacement procedure in SI.
2. Remove the ambient air sensor from its current location by carefully lifting the sensor from the radiator support cross bar.
3. Remove the harness clip nearest to the sensor.
4. Reinstall the ambient air sensor to the new location using the existing hole (1) in the lower section of the radiator support.
5. Reinstall the harness clip to the existing hole (2) in the radiator support.
6. Reinstall the radiator grille.
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer