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2006 Cadillac DTS 4.6L MIL Lamp on, open loop
Posted to GM Driveability on 4/20/2023 11 Replies

The vehicle intermittently goes into an open loop, even when sitting at a lite. When it goes into an open loop, p0420 kicks in. When I snap the throttle, it goes into an open loop, then back to a closed loop.

11 Replies Received (View Replies)

  Related Documents & Media  2006 Cadillac DTS

 
Message Closed w/FIX

car Vehicle Data

2006 Cadillac DTS

VIN 1G6KD57Y86
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / P0420,open loop
EmissionsOBD-II Compliant
SymptomsMIL Lamp on, Open Loop
OccursIntermittently

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)
Message Closed w/FIX

car Vehicle Data

2006 Cadillac DTS

VIN 1G6KD57Y86
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / P0420,open loop
EmissionsOBD-II Compliant
SymptomsMIL Lamp on, Open Loop
OccursIntermittently

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)