2010 Cadillac Truck Escalade EXT AWD V8-6.2L Technical Service Bulletin # 08-07-30-020E Date: 100303

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Technical Service Bulletin # 08-07-30-020E Date: 100303

A/T Controls - DTC P1825/P182E or P1915/MIL ON

INFORMATION

Bulletin No.: 08-07-30-020E

Date: March 03, 2010

Subject: Diagnostic Information for MIL Illuminated with DTC P1825, P182E or P1915 Found Current or as History Code in TCM, No PRNDL

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Display, Potential No Engine Crank

Models:

2006-2009 Cadillac XLR-V

2006-2010 Cadillac STS-V

2007-2009 Cadillac SRX, XLR

2007-2010 Cadillac Escalade, Escalade ESV, Escalade EXT, STS

2008-2010 Cadillac CTS

2009-2010 Cadillac CTS-V

2006-2010 Chevrolet Corvette

2007-2010 Chevrolet Silverado

2008-2010 Chevrolet Suburban

2009-2010 Chevrolet Avalanche, Tahoe

2010 Chevrolet Camaro, Express

2007-2010 GMC Sierra, Yukon Denali, Yukon XL Denali

2008-2010 GMC Yukon XL

2009-2010 GMC Yukon

2010 GMC Savana

2008-2009 Pontiac G8

2008-2009 HUMMER H2

with 6L50 RPO MYB, 6L80 RPO MYC or 6L90 RPO MYD Automatic Transmission

Supercede:

This bulletin is being revised to remove the contact information in Step 4 under HISTORY DTC heading and update the models and model years.

Please discard Corporate Bulletin Number 08-07-30-020D (Section 07 - Transmission).

The following diagnostic information will aid the technician if the MIL is illuminated with DTC P1825, P182E or P1915. The DTC may be found

current or as a history code in the TCM along with a no PRNDL display and the potential for no engine crank.

1. Use the Tech 2(R) to capture and record Freeze Frame/Failure Data for all DTCs set. Review the data to determine:

- Vehicle speed, commanded gear, transmission temperature, throttle position, transmission ratio, transmission input and output speed

sensor RPM when DTC set (use to attempt to duplicate failure)

- IMS A/B/C/P and IMS state

2. Using the Tech 2(R), navigate to transmission data and scroll down to IMS. With the ignition ON and the engine OFF, observe the IMS

A/B/C/P switch states and IMS states for each shift lever detent position. The chart following this list shows the correct states.

3. If all IMS readings are normal, monitor the PNP status in the engine data list during DTC setting to isolate a possible open or short to ground

on the dedicated PNP signal between the TEHCM and the ECM.

4. If the vehicle is a 2009 CTS, STS or SRX, proceed to Step 5 in the History DTC section below before continuing with any additional

evaluations.

5. If all IMS and PNP readings are normal, the condition is intermittent in nature and determination of the defective component will be made

based on freeze frame data and previous repair history or warranty data. Proceed to History DTC below. If the readings are not as specified

above, the fault is still active. Proceed to the Active DTC section below to determine which component(s) is defective.

HISTORY DTC

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If all readings are normal per Step 2 above, capture and record Freeze Frame/Failure Data, clear DTCs and attempt to duplicate the fail conditions.

1. If the DTC does not reset and the original freeze frame data reports an IMS A/B/C/P code of "HLLL" and the IMS state of "Neutral/Drive 6",

complete the following:

Important

Typical Freeze Frame operating conditions: ISS >500 RPM, OSS =0 RPM or low value, Engine Torque >30 Nm.

Important

There is no calibration update for vehicles equipped with a 6L90 RPO MYD transmission or 2008 model year vehicles. These

calibrations were updated before production began.

- Update the TCM calibration file to the latest released on TIS2WEB.

- Inspect the shift cable for incorrect routing, kinks, severe bends and/or a damaged or twisted rubber boot at the transmission end of the

cable.

- Check and ensure proper cable adjustment.

- Determine if the shift lever can be hung-up between Neutral and Drive 6. If so, there may be excessive drag in the system.

- Move the shift lever through each detent position, ensuring positive detent feel. If any concern is noted, remove the transmission oil pan

and repeat the shift lever movement. Ensure that the detent spring roller moves to the bottom of the valley on the detent plate for each

shift lever position. Inspect the detent spring roller and ensure it is centered on the detent plate. The spring arms should not be rubbing on

either the IMS arm or detent plate.

- After completing the above steps, test drive the vehicle, moving the shifter through all detent positions. If no issues are found, ensure all

DTC codes are cleared from history and return the vehicle to the customer. If the vehicle has been returned to the dealer with this Freeze

Frame bit codes after repairs, contact the person(s) below in Step 4.

2. If the DTC does not reset and original freeze frame data reports an IMS A/B/C/P code of "HHLH" and IMS state of "Blank", complete the

following:

Important

Typical Freeze Frame operating conditions: ISS >500 RPM, OSS >0 RPM, Vehicle Speed >0 MPH

- Replace the Internal Mode Switch (IMS) if the Vehicle Build Date is prior to March 31, 2007. If not, continue with this bulletin.

Important

There is no calibration update for vehicles equipped with a 6L90 RPO MYD transmission or 2008 model year vehicles. These

calibrations were updated before production began.

- Update the TCM calibration file to the latest released on TIS2WEB.

- After completing the above steps, test drive the vehicle, moving the shifter through all detent positions. If no issues are found, ensure all

DTC codes are cleared from history and return the vehicle to the customer.

3. If the DTC does not reset and original freeze frame data reports an IMS A/B/C/P code of "HHHL" and IMS state of "Invalid", complete the

following:

Important

Typical Freeze Frame operating conditions: ISS >500 RPM, OSS =0 RPM, Vehicle Speed >0 MPH

- Replace the Internal Mode Switch (IMS) if the Vehicle Build Date is prior to March 31, 2007. If not, continue with this bulletin.

Important

There is no calibration update for vehicles equipped with a 6L90 RPO MYD transmission or 2008 model year vehicles. These

calibrations were updated before production began.

- Update the TCM calibration file to the latest released on TIS2WEB.

- After completing the above steps, test drive the vehicle, moving the shifter through all detent positions. If no issues are found, ensure all

DTC codes are cleared from history and return the vehicle to the customer.

4. If the DTC does not reset and original freeze frame data reports an IMS A/B/C/P code of LLLH, LLHL, LHLL or PNP Switch is P/N in all

gears, failure is a short to ground condition and is most likely in the Control Solenoid (with body and TCM) Valve Assembly (TEHCM),

complete the following:

- Obtain the following data and contact the PQC as the Control Solenoid (with body and TCM) Valve Assembly (TEHCM) is currently on

restriction. The PQC will engage engineering for additional diagnostic support.

- Capture or record freeze frame or fail records if a DTC is set.

- Document the diagnostics completed leading to the decision to replace the control solenoid valve and transmission control module.

Important

There is no calibration update for vehicles equipped with a 6L90 RPO MYD transmission or 2008 model year vehicles. These

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calibrations were updated before production began.

- Update the TCM calibration file to the latest released on TIS2WEB.

- After completing the above steps, test drive the vehicle, moving the shifter through all detent positions. If no issues are found, ensure all

DTC codes are cleared from history and return the vehicle to the customer.

5. If the DTC does not reset and the original freeze frame data reports an IMS A/B/C/P code of LLLH and the vehicle is a 2009 CTS, STS or

SRX, the condition is most likely caused by an incorrectly adjusted shift linkage.

Important

Typical Freeze Frame operating conditions: ISS and OSS both =0 RPM or ISS and OSS both >0 RPM and/or vehicle is in some

drive gear (transmission gear ratio matches one of the forward gear ratios).

- Using a Tech 2(R), pull backward firmly/hard on the shifter to verify that the IMS A/B/C/P code remains at the correct HLLH reading. If

it toggles to LLLH or LLLL, the linkage is not adjusted properly.

- Perform the Shift Control Linkage Adjustment as detailed in SI.

- After adjustment, using a Tech 2(R), pull backward firmly/hard on the shifter to verify that the IMS A/B/C/P code remains at the correct

HLLH reading. If it toggles to LLLH or LLLL, the linkage is not adjusted properly. Repeat the adjustment.

- If no shifter adjustment issues are found, return to Step 4.

ACTIVE DTC/FAULT ACTIVE

If the fault is still active per Step 2 above, or after a test drive, continue with component tests defined below:

1. Ensure proper system performance:

- Inspect the shift cable for incorrect routing, kinks, severe bends and/or a damaged or twisted rubber boot at the transmission end of the

cable.

- Check and ensure proper cable adjustment.

- Remove the transmission oil pan and repeat the shift lever movement, ensuring that the detent spring roller moves to the bottom of the

valley on the detent plate for each shift lever position. Inspect the detent spring roller and ensure it is centered on the detent plate. The

spring arms should not be rubbing on either the IMS arm or detent plate.

2. Disconnect the IMS connector at the Control Solenoid (w/body and TCM) Valve Assembly (TEHCM). With the Tech 2(R) connected and

the ignition ON and engine OFF, the Tech 2(R) should report all IMS states A/B/C/P as high (H) and the PNP Switch should display "In

Gear".

- If any of the A/B/C/P circuits displays low (L), the TEHCM is faulty and should be replaced. If the Vehicle Build Date is prior to March

31, 2007, also replace the IMS.

- If the PNP Switch Circuit (Tech 2(R) Engine data) displays "Park/Neutral", a short exists in the TEHCM or the wiring connecting it to

the ECM. Disconnect the transmission pass-through connector. Check for continuity between the pass-through P/N Signal pin 3 (refer to

Automatic Transmission Inline 16-Way Connector End View in SI) and the valve body assembly. If continuity exists, a short to ground is

present in the TEHCM and it should be replaced. If the Vehicle Build Date is prior to March 31, 2007, also replace the IMS. If there is no

continuity, the problem is outside the transmission.

Important

The bad bit should be consistent with the bad bit identified in Step 2.

3. Connect a 3-amp fused jumper wire between the common pin (Pin A) and pins B, C, D & F in the TEHCM IMS connector (refer to

Automatic Transmission Internal Connector End Views in SI). As each circuit (B, C, D & F) is grounded with ignition ON, engine OFF, the

Tech 2(R) should display low (L) for the IMS bit.

- If any of the A/B/C/P circuits displays high (H) when grounded, the TEHCM is faulty and should be replaced. If the Vehicle Build Date

is prior to March 31, 2007, also replace the IMS.

- If Pin F in the PNP Switch Circuit (Tech 2(R) Engine data) displays "In Gear" when grounded, an open exist in the TEHCM or the wiring

connecting it to the ECM. Disconnect the transmission pass-through connector. Check for continuity between the pass-through P/N

Signal Pin 3 (refer to Automatic Transmission Inline 16-Way Connector End View in SI) and TEHCM IMS connection Pin F (refer to

Automatic Transmission Internal Connector End Views in SI). If there is continuity, the problem is outside the transmission. If there is no

continuity, replace the TEHCM. If the Vehicle Build Date is prior to March 31, 2007, also replace the IMS.

Important

The bad bit should be consistent with the bad bit identified in Step 2.

4. If the two tests above indicate correct TEHCM operation and the condition still exists, the IMS is faulty and should be replaced.

Important

There is no calibration update for vehicles equipped with a 6L90 RPO MYD transmission or 2008 model year vehicles. These

calibrations were updated before production began.

5. Update the TCM calibration file to the latest released on TIS2WEB.

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