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Old 03-11-2018, 10:27 PM   #1 (permalink)
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Default Car only goes 30mph and getting multiple codes

2006 Suzuki Forenza Wagon. My check engine light came on and the car would only go 30mph. Coses from ecm were p2106 (throttle actuator control system forced limited power), p2110 (throttle actuator control forced limited rpm), and p161B (DTC definition not found! Please refer to service menu).

I changed the throttle body and throttle body actuator control, air intake hose, and accelerator pedal position sensor.

After the repairs, the airbag light came on and stayed on, but the car was running fine for about 2 weeks. Then the check engine light came on again and the same problem is happing (car only goes 30mph with limited power/rpm).

I noticed some oil in the intake when I was replacing the throttle body so I ordered a new valve cover gasket but did not do the repair yet.

Does anyone have any other suggestions as to why the car is going into limited power mode? Also, how do I fix the airbag light that always remains on?
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Old 03-21-2018, 06:33 AM   #2 (permalink)
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Hi! Welcome to the forum. Ok so let’s start with oil in the intake manifold. Basically a little oil in there is normal. It’s probably from blow by gasses. To keep pressure in the engine low, extra gasses are routed out of the valve cover and into the intake manifold to be sent back into the combustion chamber. These gasses can carry a little oil with them that gets into the throttle body and intake manifold. Now onto your power problem. The p161b code has to do with the transmission. Yeahhttps://www.google.com/amp/s/www.autocodes.com/amp/codes/p161b.html
The car is going into limp mode in order to try to save the transmission from self destructing. So basically my suggestion would be not to drive the car until it’s been checked out by a mechanic. You don’t want to have to rebuild the trans. Let us know what you find out
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Old 03-21-2018, 02:04 PM   #3 (permalink)
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Don't know but here is a guess
Car seems to be in "Limp Home Mode"
Usually when a wheel speed sensor and/or vehicle speed sensor (tranny sensor)
don't send information to the ECU that correlate properly
(the speed of the vehicle and the speed of the tranny don't make sense to ECU)
The ECU will put the car into Limp Home Mode
Where the car will not run pass 30 mph or rev very high
But, lets the car limp home.
It is meant to prevent damage to the engine and transmission

Remember it is just a guess
Your issue may not be related
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