Having problems with your 2004 GMC Envoy ?
2004 gmc envoy has P2138 when the engine is cold
\015 I've diagnosed the P2138 mostly from a water intrusion perspective, because we did have water entering near the sunroof and coming into the overhead components (door opener, sunvisors, etc.), and also appeared to be travelling down the A pillar. That problem has been solved but I still get a P2138, and it's always when the engine is cold and first started for the day. If I shut it off and let it warm up a bit, it goes away (until the next day, of course)\015
Repair Help & Product Troubleshooting for 2004 GMC Envoy
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