Code 44 on a 1994 Chevy k1500

Asked by Jan 24, 2016 at 01:17 AM about the 1994 Chevrolet C/K 1500 Silverado Extended Cab 4WD

Question type: Maintenance & Repair

Alright so I just recently got a code 44 on my 1994
Chevy k1500 the check engine light turns on after
driving for a little bit, but the truck drives fine the
only thing I notice is it getting too much fuel and
black stuff coming out of the exhaust when I first
start it. I did some research and replaced the Egr
valve and solenoid and cleared my codes but it
showed back up that night.. What could be the
problem? I was told it could also be the maf sensor
but I don't think my truck has one.

7 Answers


The fuel injector spider assembly needs to be replaced it is located under the plenum on top of the cylinder heads.


Is that code po044? If so then Possible causes... - Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 - Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 harness is open shorted - Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit poor electrical connection - Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 fuse - Faulty Engine Control Module (ECM) The P0044 is set when the ECM detects an excessively high voltage through the heated oxygen sensor heater circuit Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light) P0044 Description Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM). In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground. The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications. OBDII Code P0044 - HO2S Heater Control Circuit High Bank 1 Sensor 3 -


Also check fuel pressure should not go below 60


56 to 63 lbs. on the fuel pressure. Then watch for bleed down. Should not drop more that 5 lbs. in 3 minutes.

Thanks for your help guys I ended up fixing it yesterday it was the o2 sensor and a vacume line for my pcv valve


Thats good to hear, I do believe I covered that.

My Chevy just put new motor want start it is up tdc

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