× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
2008 Chevrolet Uplander LS 3.9L MIL Lamp on
Posted to GM Driveability on 11/8/2018 13 Replies

this vehicle is driven mainly short runs by an elderly couple. P0420 will set intermittantly if cleared. If driven on highway for a half hour or longer it will clear the code. has new plugs and wires,no evidence of coolant ingestion, and no power loss sugg...

13 Replies Received (View Replies)

  Related Documents & Media  2008 Chevrolet Uplander LS

 
Open Help Request

car Vehicle Data

2008 Chevrolet Uplander LS

VIN 1GNDU23198
Engine3.9 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursIntermittently

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)
Open Help Request

car Vehicle Data

2008 Chevrolet Uplander LS

VIN 1GNDU23198
Engine3.9 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursIntermittently

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)