Surging motor RPM at 50mph

was it hilly?

 

unless it throws a code, they will not do anything. does it do it with the cc off?

 

that shouldn't effect it. check you engine oil level.

 

until you take it in, check the level to make sure it's not part of the problem.

 

How many miles on the odometer? I'm thinking of exhaust gas recirculation circuit, and it's tendency to clog. Just a stab.

 

I pay attention to the state of charge (SOC) and expect to hear the internal combustion engine (ICE) contribute more when the SOC is low. This results in more noticeable engine sound than when both are contributing. You already said your electric motor was not contributing, so engine noise is expected. You say you had cruise control engaged, so it was modulating the engine speed to maintain road speed. I would not worry about it, unless you get surging when you are accelerating. Does the engine accelerate smoothly?

 

In that case, I'd chalk it up to cruise control oscillation--over-controlling the throttle to maintain the speed. Sounds like your engine is fine.

 

Did you ever find the cause of this? I had exactly the same thing happen on the way home tonight. It's pretty cold (around -20 celcius) and I was crusing long at around 100kph and felt the car "surging" forward. I was not using cruise control. You could actually see it visibly on the fuel consumption guage - it was going up and down from around 4-7 l/100km like a yo-yo!

I floored the accelerator for a second and let it drop back down and it stopped doing it. No idea what the cause could be.

 

Having same problem. Our is gen 2 and if g put my foot down heavy up hills the engine revs like crazy but the electric motor does nothing. The battery shows as full and it does work sometimes and on EV?
Our is high milage but has been well looked after.