08 impala gear indicator [Fixed]
On my dashboard of my 2008 Impala LT where my gear indicator is
P R N [D] 3 2 1 there should be a box around which gear my car is in. Well, recently that box disappeared. Also, to check some of your settings like oil life the car has to be in park or it will say " Feature available in park". I continue to get this message even while the car is in park ever since the box disappeared. I am also getting the following trouble code p1915 & p0700 |
There must be a switch or something. I had the same problem in my Tahoe. This had a shift on the column. To shift out of park you have to pull the lever towards you. If you pull the lever towards you while it is in drive, the circle around the D disappears. There must be a switch that senses if the lever is in towards to or away from you. If a console, I bet if the button is depress the same must happen. See if something is stuck, otherwiise it may bea bad switch or sensor.
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The p0700 is a DTC to tell the PCM there is a trams. Fault and turns on the MIL. The p1915 is Internal Mode Switch Does Not Indicate Park/Neutral (P/N) During Start. Possible switch or wiring to trans. The Internal mode switch is just like it sounds it is internal to transmission. The trans control module is not seeing that the vehicle is in park and is why you are getting that message.
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Originally Posted by Wrenchinonchevys
(Post 308016)
The p0700 is a DTC to tell the PCM there is a trams. Fault and turns on the MIL. The p1915 is Internal Mode Switch Does Not Indicate Park/Neutral (P/N) During Start. Possible switch or wiring to trans. The Internal mode switch is just like it sounds it is internal to transmission. The trans control module is not seeing that the vehicle is in park and is why you are getting that message.
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A TCM failure is not likely with a problem like this. Most likely going to be wiring. A good scan tool with engine and trans data will be required. There is a diagnostic flow chart for this DTC. Not sure how comfortable you are with electrical diagnosis but will try and post the flow chart later today.
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Originally Posted by Wrenchinonchevys
(Post 308037)
A TCM failure is not likely with a problem like this. Most likely going to be wiring. A good scan tool with engine and trans data will be required. There is a diagnostic flow chart for this DTC. Not sure how comfortable you are with electrical diagnosis but will try and post the flow chart later today.
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MIL and stability light most likely from the p0700. Will post flow chart below. Don't know if it will help. It is shifting hard with this DTC because the TCM will command full line pressure.
DTC P1820, P1822, P1823, P1825, P1826, or P1915 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provide an overview of each diagnostic category. DTC Descriptors DTC P1820 Internal Mode Switch A Circuit Low Voltage DTC P1822 Internal Mode Switch B Circuit High Voltage DTC P1823 Internal Mode Switch P Circuit Low Voltage DTC P1825 Internal Mode Switch – Invalid Range DTC P1826 Internal Mode Switch C Circuit High Voltage DTC P1915 Internal Mode Switch Does Not Indicate Park/Neutral (P/N) During Start Diagnostic Fault Information Circuits Short to Ground Open/High Resistance Short to Voltage TR Signal A P1820, P1825, P1915 P1825, P1915 — TR Signal B P1825, P1915 P1822, P1825, P1915 — TR Signal C P1825, P1915 P1826, P1825, P1915 — TR Signal P P1823, P1825, P1915 P1825, P1915 — Typical Scan Tool Data Internal Mode Switch A/B/C/P Gear Selector Position A B C P Park LOW HI HI LOW Park/Reverse LOW LOW HI LOW Reverse LOW LOW HI HI Reverse/Neutral HI LOW HI HI Neutral HI LOW HI LOW Neutral/Drive 4 HI LOW LOW LOW Drive 4 HI LOW LOW HI Drive 4/Drive 3 LOW LOW LOW HI Drive 3 LOW LOW LOW LOW Drive 3/Drive 2 LOW HI LOW LOW Drive 2 LOW HI LOW HI Drive 2/Drive 1 HI HI LOW HI Drive 1 HI HI LOW LOW Invalid HI HI HI HI LOW HI HI HI HI HI HI LOW HI = Ignition Voltage LOW = 0 Voltage Circuit/System Description The internal module switch (IMS) is a sliding contact switch attached to the selector detent inside the transmission side cover. The 4 inputs to the transmission control module (TCM) indicate the transmission range selector position. The input voltage level at the TCM is high, B+, when the IMS is open and low when the switch is closed to ground. The 4 input parameters represented are Signals A, B, C and P – Parity. Refer to Transmission Internal Mode Switch Logic. Conditions for Running the DTC P1820, P1822, P1823, P1825 The engine is running for 5 seconds. The IMS indicates PARK for 1 second or greater. The engine torque is 50 Y (37 lb ft) or greater. No engine torque malfunction. P1826 No OSS DTC P0722 or P0723. DTC P1826 has not passed this key cycle. The engine is running for 5 seconds. The IMS indicates PARK for 1 second or greater. The engine torque is 50 Y (37 lb ft) or greater. Vehicle speed is 16 km/h (10 mph) or greater. No engine torque malfunction. P1915 The engine speed is greater than 560 RPM for 5 seconds. A CRANK request signal has been requested for 409 seconds or greater. Conditions for Setting the DTC P1820 The IMS signal A is continuously low this ignition cycle, and the IMS indicates transitional position D4–D3 for 8 seconds or greater. P1822 The IMS signal B is continuously high this ignition cycle, and the IMS indicates transitional position D2–D1 for 8 seconds or greater. P1823 The IMS signal P is continuously low this ignition cycle, and the IMS indicates transitional position N–D4 for 8 seconds or greater. P1825 The TCM detects an invalid combination of IMS signals for 8 seconds or greater. P1826 The TCM detects IMS signal C is high, while the gear radio indicates first, second, third, or fourth gear for 8 seconds or greater. P1915 The IMS does not indicate PARK or NEUTRAL for 2 seconds or greater when attempting to start the vehicle. Action Taken When the DTC Sets DTC P1820, P1822, P1823, P1825, P1826, and P1915 are type B DTCs. The TCM commands maximum line pressure. The TCM assumes a D4 shift pattern. The TCM freezes transmission adaptive functions. Conditions for Clearing the DTC DTC P1820, P1822, P1823, P1825, P1826, and P1915 are type B DTCs. Reference Information Schematic Reference Automatic Transmission Controls Schematics Connector End View Reference Component Connector End Views Inline Harness Connector End Views Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References for scan tool information Special Tools J 35616 GM Terminal Test Kit J 44152 Jumper Harness (20 pins) Circuit/System Verification Start and idle the engine. Using the scan tool, observe the IMS A/B/C/P parameter. The scan tool should display LOW/HI/HI/LOW. Move the gear selector through all ranges and ensure the IMS A/B/C/P parameter matches the gear selector for each selected range. Circuit/System Testing Using the scan tool, does the IMS A/B/C/P parameter display HI/HI/HI/HI for each range selected. If the IMS A/B/C/P parameter displays HI/HI/HI/HI for each range selected, repair the open in the IMS ground circuit. Turn OFF the ignition. Disconnect the automatic transmission inline 20-way connector. Additional DTCs may set. Turn ON the ignition, with the engine OFF. Observe the IMS A/B/C/P parameter on the scan tool. The parameter should display HI/HI. If the IMS A/B/C/P parameter does not display HI/HI/HI/HI, repair the short to ground in the TR signal circuit that displayed LOW between the TCM and the automatic transmission 20-way inline connector. Turn OFF the ignition. Install the J 44152 jumper harness (20 pins) on the engine side of the automatic transmission inline 20-way connector. Turn ON the ignition, with the engine OFF. Using the DMM and the J 35616 GM terminal test kit, measure the voltage at each of the TR signal circuits at the J 44152. If the voltage is less than battery voltage, test the affected TR signal for an open between the TCM and the automatic transmission 20-way inline connector. Turn OFF the ignition. Install the J 44152 on the transmission side of the automatic transmission inline 20-way connector. Measure the resistance for each TR signal circuit between the J 44152 circuit and the transmission case. The resistance should be greater than 10 ohms. If the resistance is less than 10 ohms, test the affected TR signal for a short to ground between the automatic transmission 20-way inline connector and the IMS switch. Connect the automatic transmission 20-way inline connector. Turn ON the ignition, with the engine OFF. Place the range selector in D3. Observe the IMS A/B/C/P parameter on the scan tool. The IMS A/B/C/P parameter should display LOW/LOW/LOW/LOW. If any of the TR signal circuits do not display LOW when the range selector is placed in D3, test the affected TR signal for an open or high resistance between the automatic transmission 20-way inline connector and the IMS switch. If all circuits and connections test normal, test or replace the IMS switch. Component Testing Disconnect the automatic transmission inline 20-way connector. Install the J 44152 on the transmission side of the connector and use J 35616. Referencing Transmission Internal Mode Switch Logic, test for continuity between the IMS ground circuit and each TR signal circuit at the transmission side of the automatic transmission inline 20-way connector, when Transmission Internal Mode Switch Logic indicates the signal circuit should be LOW. If any TR signal circuits do not display continuity when the table indicates it should be LOW, test the affected TR signal circuit for an open or high resistance between the automatic transmission inline 20-way connector and the IMS switch. Measure the resistance between each of the TR signal circuits and the transmission case. The resistance should be greater than 10 ohms. If any of the TR signal circuits display less than 10 ohms, test the affected TR signal for a short to ground. If all circuits and connections test normal and the IMS switch tests normal, replace the TCM switch. Repair Instructions Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for TCM replacement, setup, and programming. © 2015 General Motors. All rights reserved. |
Fixed
After replacing the throttle bottle, gas paddle and finally the transmission, the problem was still present. I than pulled the TCM to test the connectors and noticed that about 6 of the wires in the bundle had been chewed through. I then cut and soldered the bad cables and recovered the cable bundle and the car is back to running like a champ. I recommend that anyone one with a similar issue start with a visual inspection of the TCM cables then test the connectors before investing any serious money on anything else.
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