Replaced drivetrain code p1811... I think im in trouble!! - Pontiac G6 Forum
 
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post #1 of 4 (permalink) Old 02-19-2019, 04:05 PM Thread Starter
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Replaced drivetrain code p1811... I think im in trouble!!

Ok i have an 09 Gt with a 3.5L that ORIGINALLY had a auto trans with the 3.29 gear ratio. My motor was shot so i got a drive train from an 08 but it was a base model. I couldnt refuse the deal, it has a little over 100k and i only paid 150 bucks for it. Come to find out it has the 3.05 gear ratio so i know thats why i have a tranny code. I am not going to go through the trouble of swapping the old trans back in. How can i get rid of this code? Can i just plug in a base model transmission computer? Do i need to get it programmed? What should i do?

Also i have a code p0453. It doesnt look to be a common code on these cars but i dont want to drop the fuel tank to change the fuel tank pressure sensor. But i will. Any ideas on this code?
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post #2 of 4 (permalink) Old 02-20-2019, 03:29 PM
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No idea on the gear ratio. This is what I found on your code. Hope it helps, though it looks like you will need a pro scan tool for some of the steps. Good luck with the fix

DTC P0451, P0452, P0453, or P0454

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Testing and Inspection\Initial Inspection and Diagnostic Overview
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors

DTC P0451
Fuel Tank Pressure (FTP) Sensor Performance
DTC P0452
Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage
DTC P0453
Fuel Tank Pressure (FTP) Sensor Circuit High Voltage
DTC P0454
Fuel Tank Pressure (FTP) Sensor Intermittent
Diagnostic Fault Information




Typical Scan Tool Data




Circuit/System Description

The fuel tank pressure (FTP) sensor measures air pressure or vacuum in the evaporative emission (EVAP) system. The control module supplies a 5-volt reference circuit and a low reference circuit to the FTP sensor. The FTP sensor signal voltage varies depending on EVAP system pressure or vacuum. The controller also uses this FTP signal to determine atmospheric pressure for use in the engine-off small leak test, DTC P0442. Before using this signal as an atmospheric reference, it must first be re-zeroed.

Conditions for Running the DTC

P0451
DTC P0451 runs only when the engine-off natural vacuum small leak test, DTC P0442, executes.
The number of times this test runs can range from 0-2 per engine-off period. The length of the test can be up to 10 minutes .
P0452 and P0453

DTC P0452 and P0453 run continuously when the ignition is ON.

P0454
DTC P0454 runs only when the engine-off natural vacuum small leak test, DTC P0442, executes.
This test can run once per engine-off period. The length of the test can be up to 10 minutes .
A refueling event is not detected.
Conditions for Setting the DTC

P0451

This DTC will set if the controller is unable to re-zero the FTP sensor voltage within a calibrated range during the engine-off small leak test, DTC P0442.

P0452

The FTP sensor voltage is less than 0.1 volt for more than 5 seconds .

P0453

The FTP sensor voltage is more than 4.9 volts for more than 5 seconds .

P0454

If, during the engine-off natural vacuum small leak test, DTC P0442, the engine control module (ECM) detects an abrupt FTP signal change, other than a refueling event, this DTC will set. An abrupt change is defined as a change of 1 inch H2O in the span of 1 second .

Action Taken When the DTC Sets

P0451 and P0454
The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
P0452 and P0453
The control module illuminates the MIL on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC

The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.
Diagnostic Aids

P0451
A restriction in the EVAP canister or vent lines could prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot bleed off pressure fast enough, the re-zero procedure may not complete successfully, which could cause this code to set. By using the Purge Solenoid command on a scan tool, vacuum can be applied to the system instead of pressure. With the EVAP canister vent solenoid valve open and the EVAP canister purge solenoid valve commanded to 100 percent , the vacuum should not increase to more than 9 inches H2O.
Ensure that the reference port on the FTP sensor is unobstructed.
P0454
This diagnostic is designed to detect an unexpected abrupt voltage signal change from the FTP.
Scan tool output controls, snapshot, and plot functions can help detect erratic sensor response. To look at the sensor signal under vacuum conditions, use Snapshot and the Purge/Seal function to capture data while commanding purge to 30 percent , then plot the data to look for erratic sensor operation. A similar inspection can be done for the pressure side of the sensor range by applying pressure with the J 41413-200 while taking a snapshot.
Ensure that the reference port on the FTP sensor is unobstructed.
Circuit/System Verification

P0451 and P0454
If DTCs P0452, P0453, or P0641 are set, repair those first.
With a scan tool, command the EVAP canister vent solenoid valve closed.
Command the purge solenoid to 30 percent
Observe the FTP sensor voltage parameter as the vacuum increased to the abort limit.
The voltage should scale smoothly.
P0452 and P0453
Remove the fuel cap.
Turn ON the ignition, with the engine OFF.
Observe the Fuel Tank Pressure Sensor parameter with a scan tool.
The FTP Sensor parameter should be 1.5 volts .
Circuit/System Testing

P0451 and P0454

Important: Refer to the J 41413-200 operation data for detailed instructions.

Start the engine with the J 41413-200 connected to the fuel filler neck.
Allow the engine to idle.
Use the Purge/Seal function to seal the system with a scan tool.
Command the EVAP canister purge solenoid valve to 30 percent .
Observe the vacuum/pressure gage on the J 41413-200 and the FTP parameter on the scan tool.
Allow the vacuum to increase on the gage of the J 41413-200 until it reaches approximately 16 inches H2O, or until the vacuum reached the abort limit on the scan tool.
Use the Purge/Seal function to seal the system with a scan tool.
If the difference between the FTP parameter on a scan tool and the vacuum/pressure gage on the J 41413-200 is more than 1 inch H2O, replace the FTP sensor.
If the Fuel Tank Pressure Sensor parameter on a scan tool display is less than 3.2 volts , replace the FTP sensor.
P0452 and P0453
If DTC P0641 is set, repair that DTC first.
With the ignition OFF, disconnect the harness connector at the FTP sensor.
With the ignition ON, the scan tool FTP sensor parameter should indicate 0 volts .
If the parameter is more than 0 volts , test for unexpected voltage at the signal circuit. If the circuit tests normal, replace the control module.
With the ignition ON, measure for 4.8-5.2 volts between the 5-volt reference circuit of the FTP sensor and ground.
If over 5.2 volts , test for unexpected voltage at the 5-volt reference circuit. If the circuit tests normal, replace the control module.
If under 4.8 volts , test for a short to ground, or open/high resistance at the 5-volt reference circuit. If the circuit tests normal, replace the control module.
With the ignition ON, the scan tool FTP sensor parameter should indicate 4.8-5.2 volts with a 3-amp fused jumper wire connecting the FTP signal circuit to the 5-volt reference circuit.
If under 4.8 volts , test for a short to ground or an open at the signal circuit. If the circuit tests normal, replace the control module.
If the circuits and control module test OK, replace the FTP sensor.
With the ignition OFF and the ECM powered down, measure for less than 50 ohms of resistance between the low reference circuit of the FTP sensor and a good ground.
If greater than 50 ohms , test for an open/high resistance in the circuit. If the circuit tests normal, replace the control module.
Component Testing

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Fuel Tank Pressure Sensor Replacement
Control Module References for ECM replacement, setup, and programming
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post #3 of 4 (permalink) Old 02-20-2019, 07:48 PM
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Quote:
Originally Posted by Fastcat View Post
Also i have a code p0453. It doesnt look to be a common code on these cars but i dont want to drop the fuel tank to change the fuel tank pressure sensor. But i will. Any ideas on this code?
I got that code on my 06 GTP. The cable that plugged into the sensor fell off. Reached up and plugged it back in.
I have no idea how it happened, maybe you are as lucky as I was.
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post #4 of 4 (permalink) Old 02-22-2019, 08:36 PM Thread Starter
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I tried to test the fuel sensor with a snap on scan tool but it wouldnt work. Could be becuase i didnt have enough gas in it becuase it said fuel lever had to be more than 15% and i was a little less than a qtr tank. Ill try again when i get some time but my main concern is the p1811 code.... The transmission shifts fine through all gears. Ive only driven it about 60miles since ive replaced everything also.
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