P3981 Trouble Code

OBD/2 P3981 error code description and symptoms.

HO2S Sensor Circuit Malfunction (HO2S-11) During testing the HO2S Heaters are checked for opens/shorts and excessive current draw.
The test fails when current draw exceeds a calibrated limit and/or an open or short is detected. Short to VPWR in harness or HO2S. Water in harness connector. Open VPWR circuit. Open GND circuit. Low battery voltage. Corrosion or poor mating terminals and wiring Damaged HO2S heater. Damaged PCM.

A good starting point in your diagnosis is checking all system fuses and fusible links. This can be done using the DVOM on the voltage setting. You will want to test the fuses with circuits loaded. Some fuses will appear normal until a load is placed on their respective circuit; at which point they will fail. This has been the cause of many 'phantom malfunctions'. Consult your vehicle information source for fuse and fusible link locations. If all fuses are in working order, you may want to check TCM relay operation by swapping identical relays. Usually the horn relay, starter relay, fuel pump relay, air conditioning clutch relay, and controller relays are similar enough in design to swap for diagnostic purposes.

Difficulty Level (Expert)
Level
Repair Time (60 Min.)
Time
Cost Prediction : $ 80-120

P3981 Error Code Repair Process :

If your scp (j1850) invalid or missing data for vehicle speed check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system P3981 and engine control unit are in charge of monitoring a bunch of different scp (j1850) invalid or missing data for vehicle speed, and if they get a reading that's a little out of whack, up pops the check engine light.

Wrench Tool P3981 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

Common Causes of P3981

A common cause of code P3981 is the failure of SCP (J1850) Invalid or Missing Data for Vehicle Speed, but there are several other possible causes as well, such as ;

P3981 code for all cars

You can view according P3981 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+P3981 Ferrari 308 +P3981 Zeta Saloon +P3981 Bmw Serie 3 +P3981 Dkw F93 +P3981 Volvo S60 Ii

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