Why is my check engine light and VTM-4 light coming on when my car gets wet?


Asked by Apr 29, 2016 at 08:35 AM about the 2009 Honda Pilot EX-L w/ DVD 4WD

Question type: Maintenance & Repair

I have a 2009 Honda Pilot EX-L 4WD. I've noticed that when it rains or snows my check engine and VTM-4 light comes on. In about a day or so they both will go away? What could this be???

15 Answers


If this is a problem developing a code would be stored in the computer. I would say go to like Auto Zone to have it checked for codes. If there is a code, then you would know what to look at to fix the problem. You can post the code back here for the meaning and cause.

9 people found this helpful.

I have gone by auto part store a had code pulled. Its reading P0175 bank 1 system to rich.

6 people found this helpful.

This means...P0175 HONDA - Fuel System Too Rich Bank 2... Possible causes - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Faulty Mass Air Flow (MAF) sensor ......................................................................................................... - Fuel injection system does not operate properly. - The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.)... Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light) - Excessive Fuel Consumption... P0175 Honda Description... With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).

7 people found this helpful.

Is this just a sensor I can purchase? Oxygen Sensor? I really appreciate your help!

6 people found this helpful.

Yes, more than likely the front 02 sensor, the one closest to the engine. The MAF can be cleaned with electrical cleaner at the plugin. Take apart and clean.

6 people found this helpful.

Awesome! Sounds easy enough... Thank you for the speedy response.

3 people found this helpful.

I've gone online to view this 02 Sensor. They all say " Upstream or Downstream"? Which one would I need to get?

2 people found this helpful.


3 people found this helpful.

2005 honda pilot check engine end vtm4 on

26 people found this helpful.

Am driving after one my,the vtm4 on

12 people found this helpful.

I was told by the dealer whenever the check engine light comes on the VTM-4 light will also intermittently come on. The issue may not be related to VTM-4.

7 people found this helpful.

Hi I have a 04 Honda pilot and my check engine light came on and my vtm4 and it makes a cracking sound when I drive it what does that mean

22 people found this helpful.

Did anyone ever answer this? Mine is doing the same thing:-(

5 people found this helpful.

Vtm 4 light comes on my 03 Honda Pilot when driving

2 people found this helpful.

Check Engine light on, VTM4 on Honda Pilot 2003. Gives error codes P1399, P0450, P0301 - any thoughts? Owners manual says pull over immediately if VTM4 light on and shut engine off in Drive. Did this about 6 times on the way home just a few miles. Is that necessary?

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