OBDEleven P018200

[Tazz786]

Hi all,

Recently the stop start has come up on the dash showing error every now and again. If you leave the car turned off it goes away and the stop start works again. I scanned this with which shows the code P018200. So I ended up changing the fuel temp sensor myself. But the error has come on again since.

I’m sure it’s not a big problem but just wanted anyones Advise.

Anyone have any suggestions. I have a 2018 GTD 7.5.

Thank you

 

[Tazz786]

Hi everyone,

Still looking for any help with this? I took the car to a garage and they suggested I buy a temp sensor from VW. I did this and reset the codes but it still comes on. It’s always when I come to a stop that the error comes on. Not each time a stop but it’s become worse over the past couple of weeks. They tested the battery also and said that seemed fine and was charging as it should

 

[OldVWFan]

I read something about this that suggested checking the diesel fuel heater. Have you also checked to be sure that the wiring is all good and maybe clean the connector to the fuel temp sensor

 

[Tazz786]

Hi - thanks for replying. All the wiring around the sensor looks fine from what I can see. I’ve taken a look and nothing seems out of place or exposed. I will take another look though. I did also clean the connector when I fitted the new sensor. It seems strange as it’s only when I come to a stop that the error first appears

 

[OldVWFan]

Again remember to try to check the diesel fuel heater.

 

[DV52]

Hi - thanks for replying. All the wiring around the sensor looks fine from what I can see. I’ve taken a look and nothing seems out of place or exposed. I will take another look though. I did also clean the connector when I fitted the new sensor. It seems strange as it’s only when I come to a stop that the error first appears

Tazz: Hi.

It would be interesting to see the Freeze-frame data that is associated with your picture in your first post.

As you probably already know, the circuit arrangement for the fuel temperature sensor (it's called "G81" in the wiring diagram) is extremely simple - G81 has 2 x pins; an earth pin and a pin that's terminated on the ECU connector. Your picture says that this fault is "intermittent" - so I suspect that this aspect of your error is your biggest problem (intermittent errors are a pain to diagnose).

Maybe grab a multi-meter and check the earth pin (pin #1) at the sensor connector. Wiggle the wire to make sure that earth potential is sound. With the earth connection confirmed - check the integrity of the sensor wire that eventually terminates on the ECU connector. I don't have access to "Yankee" wiring diagrams and you don't identify which diesel engine is installed on this car - so I can't tell you the ECU pin number. But the wire color at the sensor plug should give you the required information.

If you still have the original sensor - maybe check if it operates correctly (I suspect that it is OK)? These sensors are normally NTC (Negative Temperature Coefficient) type. This means that the resistance of the sensor decreases with increasing temperature. So, once more - grab the multi-meter and set it to measure resistance. Then increase the temperature of the sensor with a heat-gun, or hair-dryer. Does the resistance reading change? Again, I suspect that the answer will be yes!!

Don