3800 V6 Engine Sensor Locations

Typical engine data sensor and control component locations on the GM 3.8L 3800 v6 engine.
Exact location may vary depending on vehicle year / make / model.
Click on numbers below image for component information.
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GM 3800 engine sensor location picture and diagram.

1. Fuel pressure regulator
2. Idle Air Control Motor (IAC)
3. Mass Airflow sensor (MAF)
4. Throttle Body
5. Throttle Position Sensor (TPS)
6. Fuel Injector
7. PCV Valve
8. Coolant Temp sensor (ECT)
9. Evap Purge Solenoid
10. EGR Valve
11. Intake Air Temp Sensor (IAT)
12. MAP sensor
• 3.8L Serpentine Belt Routing Diagram

Question: where is the vehicle speed sensor.
 Answer: In most cars, the vehicle speed sensor is located in the tail shaft housing of the transmission. This is where the axle comes out on the passenger side of the trans. On front wheel drive cars. Best viewed from under the car.

Where is the map sensor on this 3800 GM v6?
 The MAP sensor is located in position 7 on the picture above. The MAP sensor is on top with an electrical connector. The PCV valve is under the sensor. The sensor and the retainer unscrew from the manifold, and the PCV is inside.

where is the DPFE sensor?
 DPFE sensor is not a sensor that any GM gas vehicles use. It is strictly for diesels.

Where's the PCV valve located on a 3800 supercharged engine?
 On the supercharged, it is located under a square metal plate, in similar location as EGR valve on the non-supercharged. See Above.

Where is the Ambient Air Temperature sensor located at?
 That ambient air temp sensor is located on the front core support, in front of the radiator. Left or right side depending on make, model, and year vehicle.

where is the cam shaft position sensor at.
 On the 3800 V6, the camshaft position sensor is located behind the water pump pulley. If you were to look at the pulley straight on, it is at about the 9 o'clock position.

Where is the crank sensor located at.
 The CKP- Crankshaft Position Sensor, is located behind the crank pulley, It will need to be removed to get to the sensor.

Buick Lesabre 3800 v-6. Temperature gauge needle laying down to the right past the H. Only moves,jumps a quarter of a inch when ignition is turned on. Bad temperature sensor?
 The temp sensor only gives a reading to the gauge with the key ON, so this is most likely an instrument panel cluster (gauges) problem.

Ok I replaced that temperature sensor in the photo above, and the new one I got had just two terminals, while the old plug has three receptacles.
 Sounds like the parts guy gave you the wrong sensor. Some cars have 1 for the gauge or light, and another for the computer.

Where are the air bag sensor location(s)?
 If you are referring to the front end discriminating sensor, that depends on which airbag sensor you are referring to, and what make, model and year.

I have a series III 3.8 non S/C has a very strong vacuum in crank case.. Hard suction when removing oil cap... Replace PCV valve and seal and spring.. Problem still there..
 If the PCV valve and O rings are not the problem, then the lower intake manifold gaskets probably are causing your problem.

There are 2 other sensor where my MAF sensor is what are they?
 There would be a Intake Air Temperature sensor that is located in the rubber boot to the throttle body. And depending on the year of your vehicle, there could be an Idle Air Control Valve, that is just past the MAF sensor and on the throttle body.

I have a Pontiac and it had a check engine light on that read TPS sensor low voltage. I cleared the code and the engine died and won't start anymore. What should my absolute TPS % be without engine running? Mine is 0.0 which I don't feel is right.thx in advance.
 TPS voltage should be around .50 volts. If you are showing 0, check each wire at the connector by pulling on them to see if one breaks.

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