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Old 12-01-2006, 08:52 PM   #1
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Default Another Tech 2 code

Hello all again. The ses light light code came on again, I had it scanned at the dealer and came back with " P1811 Long shift" What does this all entail.. Is this a tranny code? Any help is appreciated. Cheers "TheKaddyKid"
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Old 12-02-2006, 12:13 AM   #2
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According to the service manual, this code will set if shifting from 1st to 2nd, 2nd to 3rd or 3rd to 4th exceeds 0.65 seconds twice in one trip. Failure records relating to this should be stored in the PCM and can be retrieved with a Tech 2 scan tool. These can aid in diagnosis. The manual lists several steps for diagnosis of the underlying problem causing this to be set. This MAY lead to replacing the Pressure Control Solenoid Valve Assy. Sorry, no idea of cost. Probably a good idea to visit a dealer or transmission shop to confirm a diagnosis. Definately a transmission code though. :(
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Old 12-02-2006, 12:16 AM   #3
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DTC P1811

Circuit Description
The transmission pressure is modified by an adaptive modifier which controls the shift execution time. This diagnostic tests the time required to accomplish the shift. If the shift takes longer than 0.65 seconds and the adaptive modifier cannot shorten this time, then a counter increases by one.

If the PCM detects a counter value of 2 during one trip, then DTC P1811 sets. DTC P1811 is a type C DTC.

Conditions for Running the DTC

The shift is adaptable.
The 1-2, the 2-3 or the 3-4 shift adapt cell has reached its limit.
Conditions for Setting the DTC
The 1-2,2-3 or 3-4 shift is longer than 0.65 seconds, twice in one trip.

Action Taken When the DTC Sets

The PCM does not illuminate the malfunction indicator lamp (MIL) .
The PCM commands maximum line pressure.
The PCM freezes transmission adaptive functions.
The PCM records the operating conditions when the Conditions for Seeing the DTC are met. The PCM stores this information as Failure Records.
The PCM stores DTC P1811 in PCM history.
Conditions for Clearing the DTC

A scan tool can clear the DTC.
The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission-related diagnostic fault occurring.
The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the PCM.
Diagnostic Aids

Ask the customer about possible overloading, exceeding the trailer towing limit, or towing in overdrive.
Ensure that the current PCM calibration is correct for the final drive ratio.
Test Description
The numbers below refer to the step numbers on the diagnostic table.

This step inspects components that may cause low line pressure.
This step inspects or repairs components that may cause a maximum adapt and long
This step inspects or repairs components that may cause a maximum adapt and long 2-3 upshift.
This step inspects or repairs components that may cause a maximum adapt and long 3-4 upshift.
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Old 12-09-2006, 11:08 PM   #4
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What would be the best possible cause for this code to be triggered. Just simply overloading the tranny or to my knowledge, the car has never towed a trailer.
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