P159F code
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,545
Likes: 77
From: Toronto ohio
P159F code
Got a check engine light and the code is P159 F. Looked it up online and it came up with
Fuel Economy Mode Switch Circuit LOW or HIGH Voltage 159F is Low voltage
Part of the issue is I have trouble with grip when it's cold outside and in Ohio we had a week of 30 degree cold weather just after I started the project so it took me a week to put it back together - the next warm day which was this Sunday in the 60s
I did install the MGW shifter and had to unplug the select mode switch to remove the console. Did a test drive and the switch worked when I changed modes.
Just wondering if the car ran a diagnostic check before I reassembled everything. Erased the code for now and hoping it will not come back on.
Fuel Economy Mode Switch Circuit LOW or HIGH Voltage 159F is Low voltage
Part of the issue is I have trouble with grip when it's cold outside and in Ohio we had a week of 30 degree cold weather just after I started the project so it took me a week to put it back together - the next warm day which was this Sunday in the 60s
I did install the MGW shifter and had to unplug the select mode switch to remove the console. Did a test drive and the switch worked when I changed modes.
Just wondering if the car ran a diagnostic check before I reassembled everything. Erased the code for now and hoping it will not come back on.
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,545
Likes: 77
From: Toronto ohio
just my luck, light came back on. guess going to take the console off again. indicator on dash shows switching, but noticed in economy still can shift into 2nd 7 speed manual shift
Race Director
Joined: Mar 2001
Posts: 19,964
Likes: 6,768
From: Bonneville Salt Flats
While you have the connector apart, again, inspect it carefully and spray with liquid contact cleaner.
My father was working at a GM dealership back in the day, when the first crudely computer-equipped cars were coming out and he swore by contact cleaner (Radio-Shack at that time). He said, it doesn't look like it does anything but it does. I've since verified its efficacy many times over. Let it dry completely and plug, unplug, replug the connector several times (assuming the pins and plug were okay upon inspection). All the best.
My father was working at a GM dealership back in the day, when the first crudely computer-equipped cars were coming out and he swore by contact cleaner (Radio-Shack at that time). He said, it doesn't look like it does anything but it does. I've since verified its efficacy many times over. Let it dry completely and plug, unplug, replug the connector several times (assuming the pins and plug were okay upon inspection). All the best.
Tech Contributor
Joined: Oct 1999
Posts: 41,055
Likes: 9,817
From: Charlotte, NC (formerly Endicott, NY)
While you have the connector apart, again, inspect it carefully and spray with liquid contact cleaner.
My father was working at a GM dealership back in the day, when the first crudely computer-equipped cars were coming out and he swore by contact cleaner (Radio-Shack at that time). He said, it doesn't look like it does anything but it does. I've since verified its efficacy many times over. Let it dry completely and plug, unplug, replug the connector several times (assuming the pins and plug were okay upon inspection). All the best.
My father was working at a GM dealership back in the day, when the first crudely computer-equipped cars were coming out and he swore by contact cleaner (Radio-Shack at that time). He said, it doesn't look like it does anything but it does. I've since verified its efficacy many times over. Let it dry completely and plug, unplug, replug the connector several times (assuming the pins and plug were okay upon inspection). All the best.
As for Code P159F here is the GM Diagnostic Procedure for figuring out what is wrong.
Bill
Heel & Toe
Joined: Oct 2017
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From: PA
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Tech Contributor
Joined: Oct 1999
Posts: 41,055
Likes: 9,817
From: Charlotte, NC (formerly Endicott, NY)
The diagnostic posted above states this code is a Type B DTC. The definition of a Type B DTC is:
A DTC is directly related to a fault discovered during a diagnostic test. ... Any of the four DTC types set when the test enable criteria is met, the test is run, and it results in a detected failure. However, Type B DTCs require two consecutive trips with a failure detected to set a DTC and turn on the MIL.
That is an indication that resetting your code will only work for one ignition sequence and the code will set again. To find and fix the problem you will need to pull the console apart again to access the drive mode switch and it's electrical connection. Make sure the connector is fastened properly to the switch and trace the wires back to where they come into the console area to make sure one or more didn't get pinched or cut when the console was reassembled. If there is nothing obvious and the code persists you will have to get busy with a DVM to check resistances and voltages.
Bill
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,545
Likes: 77
From: Toronto ohio
When in Track Mode did you push the center button twice to enter the PTM mode selection menu and try to select Wet, Dry, Sport 1, Sport 2 and Race?
I didn't even know there were sub options in track mode
I didn't even know there were sub options in track mode
Tech Contributor
Joined: Oct 1999
Posts: 41,055
Likes: 9,817
From: Charlotte, NC (formerly Endicott, NY)
From the 2019 OM (earlier versions with different page numbering system have the same content):
This is one of the best features of the car. It lets you drive it closer to the limit. All of the people who do videos and say they put the car in Track Mode don't address the sub modes and what they might do. Just moving the selector to Track Mode without pushing the button twice leaves you in an undefined mode. It your car has MRC it has PTM and Competition Mode (a carry over from the C5 and C6 days) is only available in Sport Mode.
Bill
Pro
Joined: Dec 2000
Posts: 722
Likes: 342
From: Vancouver British Columbia
Had the same DTC after disconnecting the battery for a few days in order to remove and work on the seats. Naturally there was no trickle charger connected to the battery. Consequently I had a difficult time starting the engine. I should have recharged the battery prior to attempting to start. The low voltage resulted in DTC P159F. Cleared the code and it has run fine ever since. I am always amazed at how little reserve there is in the OEM battery.
Jacob
Jacob