Question about 2007 Suzuki Forenza Sedan

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Car jerks sometimes when going from P to R

Sometimes (about 50%) when i put my car into reverse it will jerk violently and throw a check engine light. after this happens when i put it into drive I cant break 3k rpm. I have to turn the car off in Park and let it sit then restart the car and it works fine afterward. the jerk is starting to increase in frequency.

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It's the transmission sensor. I've had mine replaced three times now. You can fix it (see this thread: and please report it to Suzuki at 1-800-934-0934

Posted on Feb 26, 2013

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The is NOT a tranny problem.
it is an Engine/EFI problem
it is excessive RPM.
can be cause by many things,
1; bad ISC (dirty and stuck open) (or IAC)
2; air leaks (vacuum) to the intake manifold.
(to name just 2, of many) also TPS idle switch or mode bad.

"when i put it into drive I cant break 3k rpm"
i can not understand this, line. break?

if you have an 3000 RPM idle that is wrong, dead wrong.
they transmission clutch if fully engaged at that RPM and
will jerk on any car. How can it not.?
you could take the car to any shop that employs ASE mechanics
and ask them to Diagnose it. saving huge costs guessing and wasted time and veh. down time...

Posted on Sep 21, 2013


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Posted on Jan 02, 2017

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is this car still under warranty? if so take it back to the dealer and don't accept it as repaired till you drive it. sounds like the logic that controls the transmission is flipping out, sometimes they will tell you that it needs a reflash. what this amounts to is that the manufacturer put some not so great programming in the logic when they built the car but now they have a patch or fix that makes it work better but you have to pay them for their time to install the fix. ask them what they will charge you for the privilege and decide if it's worth it to you. there is a recorded technical service bulletin about harsh shifts for your car. well, actually there are two, the latest one a revision of the first. i would try to make this their problem, it really is. hope this helps.

Posted on May 28, 2009

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