Question about 1996 Chevrolet Tahoe
Installed a performance level two 4L60E in my 4x4 Tahoe. Also had it setup for towing.
The performance is great, firm shifts, but not harsh, upshifts and down shifts as needed.
Problem is I keep getting error code P0700. After some reading I became aware of grounding issues with some early 1996 Tahoe VCM's. I checked serial number of VCM and it has the upgrade ground wire from factory. The transmission builder also suggested an additional ground wire to transmission case and chassis in case paint on bell housing ruins the ground path to engine.
I also have two other codes since replacing transmission: P0140 O2 sensor and P1192 dealer specific code?
Not to confuse the issue but these maybe related due to disabling features of computer system.
Does anyone have any ideas on what is causing P0700?
P0140 Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
P1192 Post-catalyst Fuel Trim System Bank 1
Replace the O2 sensor after the catalytic Converter and check to make sure the wire harness and clips are not damaged. Also check the O2 sensor fuse in the fuse panel to make sure there not blown.
As for the p0700 code is a generic code and the ECM needs to re-calibrated for the performance upgrade in your transmission. It's common to happen when there are changes like the transmission fluid pressure has been altered which would give it a better and firmer shift, but the transmission reads the higher line pressure as a problem. If you take it to a good transmission shop with a tech2 scanner, the tech2 can change the transmission ECM parameters and that way it will recognize the higher transmission line as a norm.
Have done a few upgrades on the 4L60E with a common swap of the servo's with a corvette servo's ($45.00) to firm up the shift and raise the transmission line pressure to keep the slipping to a minimal and also bring down the shift points at WOT on the 1st-2nd shift to get going a bit faster (used Tech2 scanner).
Good luck and keep me posted, be glad to help.
Posted on Jul 22, 2009
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Posted on Jan 02, 2017
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