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VTEC problem: Code P2646 (also 2647, 2648, 2649)

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cel element 2003 engine engine light jumping limp mode malfuntion p2646 p2647 p2648 p2649 rpm vsa vtec
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#81 · (Edited)
Welcome, Reiterdie.

If you plan to work on the car in the future, get a service manual now; it will pay for itself on this job alone. Otherwise, you'll only need ordinary metric tools. That valve assembly is a bit of a pain to get to, wedged between the back of the engine and the firewall, but some patience, knuckle-busting, and swearing will get you through it.

Service manual:
H&A
Helm Inc.
 
#82 ·
Good Fix

Hi - had a prob with my El. When accel especially going up hill or trying to pass, would stall out and set the engine light and rev limiter. couldn't rev past 2700 rpm. VERY dangerous !! Turn it off, restart and all good until the next time. Problem turned out to be the Vtec selenoid filter was clogged with carbon and sluffed off bronz babbet. Three 10mm screws takes off the valve with it's micro wire screen filter which is part of the gasket. cleaned the filter put it back on the engine and all Good !! Easy fix. Captdale.
 
#83 ·
HELP.........have posted in this thread before, very helpful.
can not stop the limp mode from happening. changed oil and filter. still getting engine light and p2646 code. cleaned the screen on the v-tech/oil pressure switch. still going into limp mode. went to honda and bought and installed the whole v-tech/oil pressure assembly with new screen. still going into limp mode............:evil:
am at my whits end..............
 
#86 ·
update.......i started all over. took everthing off. found a lose wire. i believe it is the oil pressure sensor below the v-tech assembly. it has been hot in So Cal all week and i did not let motor cool enough. was trying not to burn my forearm on the side of motor. i must have pulled it out. all put back together. so far so good. the test will be monday when i drive to work..............
 
#87 · (Edited)
update.............i drove to work this mourning and about 20 minutes into my commute...........YES limp mode. pulled code p2646..........this is getting old. i cleaned the what i believe is the oil pressure sensor below the v-tech assembly. if it happeneds again tomorrow will buy a new one. if that doesnt work am going to trade it in for a FORD.......
could it be something else???????????
 
#88 ·
as you can see, i bought and installed the factory honda v-tech assembly.
i attempted to install an auto zone oil pressure switch. but after taking out the old one it was clear that the dura last one had a bigger threaded end. so after taking back to them and double checking everything, i was refunded my money and bought the right one from honda.......

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so after installing everything new and of course new oil and filter. yes as soon as i get up to freeway speed then slow down............engine light and "LIMP MODE"..............:evil:
 
#91 ·
P2646 rocker arm actuator

Hey guys.
I popped this code p2646 again.. The first time was 10or so months ago. An today it popped again. Last time it was solved by cleaning the oil pressure screen. Why would this pop again? How could debris get clogged again
 
#93 ·
Yes the oil was changed at the same time. Here is the exact code

"P2646- A rocker arm actuator system performance or stuck off bank 1"
 
#94 ·
dom08 said:
Yes the oil was changed at the same time. Here is the exact code

"P2646- A rocker arm actuator system performance or stuck off bank 1"
Click to expand...
thats exactly what code i keep getting as you can see i have tried almost everything. have been told by some people that i could have a faulty ECM.
what do you guys think about that? e-bay has them around 50.00-150.00......
 
#95 · (Edited)
Mine isn't constant though. When I start my truck after about an hour or so of it being off...drive around for 10-15 minutes and it starts to bog at 3000 rmp. The CEL will stay on this whole time keep in mind. I was thinking of replacing the oil pressure switch, any thoughts?

Edit: I did clean the screen yesterday (it was a bit dirty) and 10 minutes after erasing the CEL it came back on with the 3000 rpm bog issue
 
#96 ·
dom08 said:
Mine isn't constant though. When I start my truck after about an hour or so of it being off...drive around for 10-15 minutes and it starts to bog at 3000 rmp. The CEL will stay on this whole time keep in mind. I was thinking of replacing the oil pressure switch, any thoughts?

Edit: I did clean the screen yesterday (it was a bit dirty) and 10 minutes after erasing the CEL it came back on with the 3000 rpm bog issue
Click to expand...
the oil pressure switch cost 23.00 at honda, the v-tech assy-spool is 130.00.
try the small stuff first. i am split between taking to honda or just getting a ECM off of e-bay.........
 
#97 ·
Try getting yours just diagnosed at Honda to see the issue and take it from there. Mine has been getting better on its own. When I erase the code it stays off for quite a bit now but I just picked up an oil pressure switch anyways
 
#98 ·
Honda wants to charge me 49.99 for a diagnostic. am tempted to do it just to see what they say. i have a real nice snap on code reader and i keep getting the same code 2646.
 
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