GM Volt Forum banner

1 - 6 of 6 Posts

·
Registered
Joined
·
1 Posts
Discussion Starter #1
Hello all,

First time post.

Low speed loud engine noise comes on and goes away?! Its like the engine is over revving and settling down but is quite annoying. Not sure if engine or the charging (inverter) is the root cause here, any help or suggestion would be appreciated.

Nav Jessel
 

·
Administrator
Joined
·
19,980 Posts
Only happens after you have depleted the battery or placed the car in Hold mode? Normal. That's the gas engine generating electricity and putting it in the battery so you can keep driving. Most noticeable when stopped at a light.
 

·
Registered
Joined
·
433 Posts
Engine speed is independent from vehicle speed in the Volt.
 

·
Registered
Joined
·
2,634 Posts
Hello all,

First time post.

Low speed loud engine noise comes on and goes away?! Its like the engine is over revving and settling down but is quite annoying. Not sure if engine or the charging (inverter) is the root cause here, any help or suggestion would be appreciated.

Nav Jessel
I am going to guess since you are posting this here, this is a new behavior for your car? It is really hard to diagnose sounds by text because everyone is a little different on how they hear or what they consider loud, etc. Can you make a short video if it is something new to your car and post it on youtube or something?

If you are new to the Volt, as others say, the engine revs don't necessarily match the accelerator pedal position.

Eric
 

·
Registered
Joined
·
312 Posts
When on ICE, rpm is controlled electronically by car speed and accelerator pedal position. Keep the car charged as much as you can and just enjoy the ride.
 

·
Registered
Joined
·
1,106 Posts
I too experienced the revving engine at pretty much any speed (city and highway) when the battery was depleted, or I changed to hold mode. I pretty much learned that the battery doesn't like to be discharged below 15%, or wherever your hold point is when you initially place it in hold mode. From there, the engine takes about 30-60 seconds from initial start where it's at a low to slightly higher idle in order to get things lubricated and begin the warm up process. During this time you are continuing to deplete the battery below the set points of 15% or wherever your hold point was set at (if in hold). When the engine finally comes alive, it will most certainly rev to higher RPM's in order to rebuild the depleted charge as quickly as possible along with any additional power to avoid further depletion. Once the battery has returned to it's happy set point, the engine should settle down and either run at a more normal speed, or turn off entirely depending on how much power is in demand and the current SOC in the battery.

In your case it's almost certain that the engine is just building the buffer back up to it's minimum set point, then sees that energy demand isn't sufficient to keep running, so it turns off and will repeat the cycle again within a few minutes or less. Unfortunately I don't think there is much of a fix to avoid the initial high rev and just happens to be one of the little quirks one will hopefully get used to and learn to tune out.
 
1 - 6 of 6 Posts
Top