A/C - MIL/Check Engine Light On DTCs P060/P0138
TECHNICALBulletin No.: 10-06-04-010
Date: July 22, 2010
Subject: Intermittent MIL/Check Engine Light On, DTCs P0607 and/or P0138, Vehicle Stability Control Lamp On, Driveability Concerns in High Ambient Temperatures with A/C On (Clean HO2S Connector and Inspect/Unplug Evaporator Drain Tube)
Models:
2003-2010 Pontiac Vibe
Equipped with AWD or FWD
Condition
Some customers may comment on an intermittent MIL/check engine light and/or an illuminated vehicle stability control light. They may also comment about driveability concerns in high ambient temperatures with the A/C on.
Upon further diagnosis, a technician may find DTC P0607 and/or P0138.
Cause
This condition may be caused by water leaking from the evaporator onto the electrical connector in the center IP area. The evaporator drain may be restricted, causing water to drip from the evaporator case onto the post HO2S connector. This creates a path for current to flow from the heater circuit to the HO2S signal circuit. There may not be carpet wet from this leak, only the connector.
Correction
Note
The drainage from the HVAC case may not be extensive enough to cause wet carpet or other damage.
1. Remove the side IP panel (1) then move the carpet back to gain access to the HO2S connector.
2. Locate the HO2S connector (1). Clean the connector with compressed air and apply a small amount of silicone grease to the connector.
3. Locate the HVAC core box (1). Inspect for moisture in that area. If moisture is present, it's possible that a plugged evaporator drain tube may be the issue.
4. Install the carpet back and reattach the IP side panel.
5. Inspect for a plugged evaporator drain tube. Force compressed air up the drain hose to remove excess water. Drain until a steady flow is achieved and the blockage is cleared.
6. Test drive the vehicle then inspect the evaporator drain tube to verify if it is operating correctly.
Warranty Information
For vehicles repaired under warranty, use the table.
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