Chevrolet P0154 A/F Sensor 21 Heater System Malfunction

Description

OBD-II Trouble Code Description for P0154 Chevrolet

O2 Sensor Circuit No Activity Detected

What does this mean?

OBD2 Code P0154 Chevrolet definition:
The oxygen sensors are critical to the engine running properly. It basically informs the PCM (Powertrain Control Module) of oxygen content of the exhaust. The PCM then uses this information to regulate fuel into the engine and maintain proper air:fuel ratio. It is a four wire sensor, with the PCM providing a reference/signal voltage of about half a volt (0.5v) to the sensor. It usually provides a ground also. The other two wires are dedicated to the oxygen sensor heater element. This heater allows the sensor to warm up faster, which allows the engine to enter closed loop faster, reducing startup emissions. The heater element is supplied a 12v feed from the power distribution center (usually) and a ground. The oxygen content of the exhaust affects the O2 sensor resistance. This resistance produces a counter voltage on the reference/signal wire that the PCM will use to analyze oxygen in the exhaust. Lean exhaust produces low voltage, while rich exhaust produces high voltage. The oxygen sensor is capable of varying between 0.9v (rich) and 0.1v (lean). Once the engine reaches closed loop, the O2 sensor should begin switching rapidly between rich and lean voltages 2-3 times per second. If for some reason the O2 sensor doesn’t switch properly or “sticks”, P0154 Chevrolet may set. This code indicates the O2 sensor isn’t operating.

Symptoms

Possible sumptoms of OBD code P0154 Chevrolet
Symptoms of a P0154 Chevrolet code may include: MIL (Malfunction Indicator Lamp) illumination Other codes indicating rich or lean condition may be present Poor idle, won’t idle Misfire at idle or at highway speed Engine may blow black smoke at tailpipe Fuel economy may decrease May start and stall

Causes

Possible causes of OBD code P0154 Chevrolet
Potential causes of a P0154 Chevrolet code include: Faulty bank 2,1 Oxygen sensor Holes in exhaust near oxygen sensor Short to voltage or ground on signal circuit Open or high resistance in signal circuit Wiring harness chafing/rubbing on exhaust components Water/oil intrusion at O2 sensor connector Broken lock or loose terminals on O2 sensor connector Oil/coolant fouled oxygen sensor

Possible Solutions

First start the engine and bring it up to operating temperature and ensure the engine reaches closed loop. Then, using the live data function on a scan tool, observe the Bank 2,1 oxygen sensor voltage reading. Is it switching properly? If so, the problem may be an intermittently bad sensor or more likely a wiring problem. Visually check the O2 sensor wiring and repair as needed. Does the voltage for the Bank 2,1 oxygen sensor appear to be “stuck” and not moving? If so, increase idle speed for 30 seconds or so. If the sensor begins switching after a period of elevated idle, visually check the exhaust for holes or rust near the O2 sensor that could be affecting the voltage reading If the exhaust checks out, suspect the sensor to be sluggish and replace it. If the Bank 2,1 oxygen sensor appears to be not switching, turn the engine off, and unplug the Bank 2,1 oxygen sensor. With KOEO (Key on engine off) jumper the O2 sensor signal wire to the ground wire. Now the voltage reading should be low (about 0.1v). If it is, then check for a bad connection at the O2 sensor connector. Repair as necessary. If no bad connection is found, replace the O2 sensor and re-check. If when you jumper the signal wire to the ground wire the voltage reading isn’t low (about 0.1v), remove the jumper wire. Now check for voltage at the O2 sensor signal wire. It should have, with KOEO and O2 sensor unplugged, roughly 0.5 volts. If it does, check also for a good ground to the sensor as well. Repair as necessary Check for loose connections, water intrusion at PCM connector, etc. If you have no 0.5 volt reference voltage, unplug the PCM connector and ohm the signal circuit and ground circuits. There should be no resistance nor any voltage. Repair excessive resistance. If you still have no 0.5 volt reference voltage, recheck at the PCM connector. It may be necessary to clip the signal wire to eliminate the possibility of a short or open somewhere. If you now have reference voltage present coming out of the PCM, fix open/short in signal circuit. If you have no reference voltage coming out of the PCM, the PCM will have to be diagnosed for a fault. It may be the problem.

The OBD2 Code Information Be Applicable For Chevrolet

2013 Chevrolet Traverse2013 Chevrolet Trailblazer2013 Chevrolet Spark2013 Chevrolet Sonic RS2013 Chevrolet Onix2013 Chevrolet Malibu ECO2013 Chevrolet Malibu2013 Chevrolet Cruze Station Wagon2013 Chevrolet Corvette 427 Convertible2013 Chevrolet Camaro ZL1 Convertible2013 Chevrolet Camaro Hot Wheels Edition2013 Chevrolet Camaro 1LE2012 Chevrolet Tru 140S Concept2012 Chevrolet Sonic Sedan2012 Chevrolet Sonic2012 Chevrolet Silverado2012 Chevrolet Orlando2012 Chevrolet Cruze Hatchback2012 Chevrolet Corvette Z06 Centennial Edition2012 Chevrolet Corvette Daytona Racecar2012 Chevrolet Colorado2012 Chevrolet Code 130R Concept2012 Chevrolet Captiva2012 Chevrolet Camaro ZL12012 Chevrolet Camaro EU Version2012 Chevrolet Camaro Convertible EU Version2012 Chevrolet Camaro COPO Convertible2012 Chevrolet Camaro COPO2012 Chevrolet Camaro 67 Hot Wheels Concept2012 Chevrolet Camaro 45th Anniversary Edition2012 Chevrolet Aveo Sedan2011 Chevrolet Volt2011 Chevrolet TrailBlazer Concept2011 Chevrolet Silverado HD2011 Chevrolet Sail2011 Chevrolet Miray Concept2011 Chevrolet Cruze2011 Chevrolet Corvette Z06 Carbon Limited Edition2011 Chevrolet Colorado Rally Concept2011 Chevrolet Colorado Concept2011 Chevrolet Caprice Police Patrol Vehicle2011 Chevrolet Camaro SS Convertible Indy 500 Pace Car2011 Chevrolet Camaro Convertible Neiman Marcus2011 Chevrolet Camaro Convertible2011 Chevrolet Aveo2010 Chevrolet Volt MPV5 Concept2010 Chevrolet Spark2010 Chevrolet Equinox2010 Chevrolet Corvette Z06X Concept2010 Chevrolet Corvette Grand Sport2010 Chevrolet Camaro Transformers2010 Chevrolet Camaro SS Indy 500 Pace Car2010 Chevrolet Camaro SSX Concept2010 Chevrolet Camaro SS2010 Chevrolet Camaro Red Flash Concept2010 Chevrolet Camaro2010 Chevrolet Aveo RS Concept2010 Chevrolet Agile2009 Chevrolet Traverse2009 Chevrolet Stingray Concept2009 Chevrolet Cruze WTCC2009 Chevrolet Cruze2009 Chevrolet Corvette ZR12009 Chevrolet Corvette GT12009 Chevrolet Aveo52008 Chevrolet Orlando Concept2008 Chevrolet Matiz2008 Chevrolet Malibu LTZ2008 Chevrolet Malibu LT2008 Chevrolet Lumina SS2008 Chevrolet HHR SS2008 Chevrolet GPiX Concept2008 Chevrolet Equinox Sport2008 Chevrolet Corvette2008 Chevrolet Captiva Sport2008 Chevrolet Camaro LS7 Concept2008 Chevrolet Camaro GS Racecar Concept2008 Chevrolet Camaro Black Concept2008 Chevrolet Aveo2007 Chevrolet Volt Concept2007 Chevrolet Trax Concept2007 Chevrolet Tahoe2007 Chevrolet Suburban LTZ2007 Chevrolet Silverado Regular Cab2007 Chevrolet Silverado Extended Cab2007 Chevrolet Silverado Crew Cab2007 Chevrolet Silverado 3500 HD LTZ Crew Cab2007 Chevrolet Silverado 2500 HD LTZ Extended Cab2007 Chevrolet Jay Lenos Corvette C6RS E852007 Chevrolet HHR Panel2007 Chevrolet Groove Concept2007 Chevrolet Camaro Convertible Concept2007 Chevrolet Beat Concept2007 Chevrolet Avalanche LTZ2007 Chevrolet 34 Coupe E85 Concept2006 Chevrolet WTCC Ultra Concept2006 Chevrolet TrailBlazer SS2006 Chevrolet Silverado Z71 Extended Cab2006 Chevrolet Silverado Intimidator SS2006 Chevrolet Silverado Hydrogen Military Vehicle2006 Chevrolet Sequel Concept2006 Chevrolet Nubira Station Wagon WTCC R2006 Chevrolet Monte Carlo SS2006 Chevrolet Malibu SS2006 Chevrolet Malibu Maxx SS2006 Chevrolet Kodiak C45002006 Chevrolet Impala SS2006 Chevrolet Impala2006 Chevrolet HHR LT2006 Chevrolet Epica2006 Chevrolet Corvette Z06 Daytona 500 Pace Car2006 Chevrolet Corvette Z062006 Chevrolet Cobalt SS2006 Chevrolet Cobalt LT2006 Chevrolet Celta2006 Chevrolet Captiva2006 Chevrolet Camaro Concept2006 Chevrolet Aveo Sedan2005 Chevrolet West Coast Customs HHR2005 Chevrolet Uplander2005 Chevrolet Silverado Hybrid2005 Chevrolet Kodiak2005 Chevrolet Equinox2005 Chevrolet Corvette C6R Race Car2005 Chevrolet Corvette C62005 Chevrolet Corvette2005 Chevrolet Cobalt Sedan2005 Chevrolet Cobalt SS Supercharged Coupe2005 Chevrolet Cobalt SS2005 Chevrolet Cobalt2005 Chevrolet Cavalier Xtreme2005 Chevrolet Astra GSi 2.0 16V2005 Chevrolet Astra 2.0 Flexpower Elite2005 Chevrolet Astra 2.0 Flexpower Elegance2005 Chevrolet Astra 2.0 Flexpower Comfort2004 Chevrolet Tracker Turbo2004 Chevrolet Silverado2004 Chevrolet SOCAL SSR Bonneville Salt Flats2004 Chevrolet S3X Concept2004 Chevrolet Nomad Concept2004 Chevrolet Monte Carlo SS2004 Chevrolet Matiz M3X Concept2004 Chevrolet Malibu Maxx2004 Chevrolet Malibu2004 Chevrolet Lumina SS2004 Chevrolet Impala SS2004 Chevrolet Express2004 Chevrolet Electric S-10 Concept2004 Chevrolet Corvette Z06 Commemorative Edition2004 Chevrolet Colorado Regular Cab2004 Chevrolet Colorado LS Z71 Extended Cab2004 Chevrolet Colorado LS Z71 Crew Cab2004 Chevrolet Colorado LS Regular Cab2004 Chevrolet Colorado LS Extended Cab2004 Chevrolet Colorado LS Crew Cab2004 Chevrolet Colorado Extended Cab2004 Chevrolet Colorado Cruz2004 Chevrolet Cheyenne Concept2004 Chevrolet Aveo LS 5 Door2004 Chevrolet Aveo LS 4 Door

 

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