Erased code and drove very briefly, lamp was off but came back on in short time. Also, the LEDs on the switch would ran-domly go on and off. Upon investigation, the technician may find a DTC B2725. B2725 Engine Trouble Code. 2000 s10 blazer b2725 transfer case perform diag test and replace switch in dash cleared code for one day ok.light came back on service 4wd now auto 4wd on switch wont change when selector used have a … read more 1999 Chevrolet Avalanche Transfer Case TSB Details … 1999 Chevrolet C Series Others TSB Details … 1999 Chevrolet K Series Others TSB Details … 1999 Chevrolet Silverado Transfer Case TSB Details … 1999 Chevrolet … "Service 4WD" Indicator Illuminated, DTC B2725 Set (Replace Transfer Case Shift Control Switch) 2002 Chevrolet and GMC S/T Utility Models (Trailblazer, Envoy) with Four Wheel Drive Condition Some owners may comment on the Service 4WD Indicator illuminating. During Open Loop, the ECM determines fuel delivery based on sensor signals without heated oxygen sensor (HO2S) input. P0172 CHEVROLET Meaning The Engine Control Module controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control.Fuel delivery is controlled differently during Open Loop and Closed Loop. Replaced the switch in … As I pressed various buttons, the scan data would not indicate the proper input. He told me that 9.9 times out of 10 it is just the push button switch that is bad, but when that switch is bad only about 2-3 codes are thrown, not 10. Set up scanner and retrieved code B2725 Active transfer case mode switch fault. U1000-class 2 data link malfunction Anyone have any ideas? I was thinking push button as in, say, a second-gen Blazer or Jimmy. DTC B2725, I was ready to continue my diagnosis. Pressing “4HI” or “4LO” would not always result in the data stream reflecting that condition. This page is to help you diagnose and repair the Auto 4WD system found on most General Motors (Chevrolet/GMC) GTM800 (1999-2006) platform SUVs and some pickup trucks. The following TSBs of Chevrolet are related to DTC B2725. Check out the 2021 Blazer with its bold, sophisticated design and performance & capability to match its a mid-size SUV that delivers style & substance. I simply pressed the buttons while watching the scan data. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap. B2725-mode switch circuit malfunction. Cause 2021 Chevy Blazer | Mid-Size Sporty SUV You are currently viewing Chevrolet.com (United States). Vehicle comes in with service 4 whl drive lamp on. B0790-Transfer Case Neutral Indicator Circuit Malfunction I recently had my cab replaced due to a accident. Before I never had a issue with 4wd. In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. Subject: "Service 4WD" Indicator Illuminated, DTC B2725 Set (Replace Transfer Case Shift Control Switch) Models: 1999-2002 Chevrolet and GMC C/K Pickup and Utility Models (Silverado, Sierra, Avalanche, Suburban, Tahoe, Yukon, Yukon XL) with Four Wheel Drive and NVG 236/246 Transfer Case (RPO NP8) B2725-Active Transfer Case (ATC) Mode Switch Circuit Malfunction. ... says "w/push button control". Meaning of B2725 engine trouble code is a kind of body trouble code and when your car's 'B2725 Check Engine' light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. But ever since I got it back have had these codes.