Help, what is code 26? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-01-2010, 04:09 PM   #1
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Default Help, what is code 26?

I know it is quad module driver A failure. Which are the sensors handled by quad A? TPS? Coolant temp?
The whole story behind this started a couple of years ago with the idle rpm going up on it'* own with no apparent reason. The only way to make it normal was to turn the engine off and start it again.
Over the time I changed several IAC'*, TPS'* and even ECM'*. No result. I recently checked and replaced all rubber vacuum connections to eliminate all possible leaks, disconnected the Cruise cable so that one isn't pulling the throttle, no result. I am using Tuner Pro RT to get what is ECM seeing from sensors and the only thing is that TPS% and TPS Volts are high corresponding to the increased unwanted idle.
Sometimes I was getting code 22 at idle, and recently I am getting code 26 when accelerating and the engine is not up to normal temperature. Since I changed almost everything I made a new wire harness for the TPS and the CTS (I realized that they share a sensor ground). Although the idle doesn't appear to go up anymore (although I didn't drive it enough to be conclusive) I am still getting code 26 under acceleration and low temp. All of this is directing me to change the CTS even though the Tuner Pro shows the temperature OK.
What is quad A driving?
On a separate note, after seeing on this forum that everybody is so happy with changing the Magnavox to the Delco I tried it too. After changing a dozen ICU'* and coils from car heaven I had to return to my old Magnavox. The engine was misfiring under heavy acceleration. Recently I got new wires, new Delco ICU and new coils yet the car is still misfiring (I can hear isolated explosions in the exhaust confirming that the fuel mixture left the cylinder without having a spark) under heavy acceleration ONLY when the engine temp is up. If the engine is cold the ICU works without missing a beat. This also directs me in the Coolant Temperature Sensor direction.
Anybody knows what is in this quad A?

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Old 05-02-2010, 12:14 PM   #2
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Default I fixed the 26 code

The canister connector was not fully in. Also it appears that the idle rpm is normal so far.
I am left with the biggest puzzle. Why my car won't accept the Delco ICU. It still misfires under acceleration and warm engine. Maybe I need a different ECM memory? Anybody knows?
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Old 05-03-2010, 09:19 AM   #3
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Please do a quick search and list out the name of the code. In that search you should also find the answer to which items are controlled. From there we can tell you the most common failures to check.
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Old 05-03-2010, 12:03 PM   #4
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It was the canister, the connector was not fully in.
I am left with the biggest question. Why my car won't accept the Delco ICU. What puzzles me is that it misfires (fires erratically) only under (heavy) acceleration and with the engine warmed up. If the engine is cold it runs great. Yesterday I installed the Magnavox back and the engine runs normal although I can feel that the acceleration is not as strong as with the Delco (when cold). I've been told before and I know that "If it aint broke don't fix it" but I am frustrated that everybody is so happy with Delco and I can not make mine to work. Do I have a freak car, is there maybe a different ECM memory that I need?
I actually have a reason to change the Magnavox, it'* old and the tach looses the signal intermittently.

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Old 05-03-2010, 01:34 PM   #5
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Did your car go to the local hospital ICU recently?

I think you are talking ICM (Ignition Coil Module). There were a couple different versions and you'd want the right one. It'* also possible that the ICM you have is bad.
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Old 09-02-2011, 07:16 PM   #6
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This problem have solved?
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Old 09-06-2011, 04:27 PM   #7
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This thread is over a year old. You may want to start a new thread if your have the same problem.
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