Question about GMC Envoy XL
Hi Code P0894: Remove the transmission valve body, Clean, inspect & replace any worn parts. Sticking valves & debris built up in the valve body usually causes this. Please get back to us if you have further query else please accept the suggestion.
P0742: It's a case of stuck TCC solenoid. Actually this is very common on GM vehicles. It is condition of lockup torque converter. It is suggested for a transmission fluid and filter change to see if the clean fluid will clean out the TCC solenoid. If not, it will have to be replaced.
Code P0894: Remove the transmission valve body, Clean, inspect & replace any worn parts. Sticking valves & debris built up in the valve body usually causes this.
Please get back to us if you have further query else please accept the suggestion.
Posted on Mar 15, 2011
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Posted on Jan 02, 2017
Tips for a great answer:
Inspect the transmission fluid for debris.
DTC P0742 Torque Converter Clutch System Stuck ON Step
Was the Powertrain On-Board Diagnostic (OBD) System Check performed?
Go to Step 2
Go to Powertrain On Board Diagnostic (OBD) System Check
Install the Scan Tool .
With the engine OFF, turn the ignition switch to the RUN position.
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data. Record the DTC Freeze Frame and Failure Records, then clear the DTC.
Start and run the vehicle.
Select TCC Slip Speed on the scan tool.
With the transmission in D4, drive the vehicle through the 1-2 upshift.
In second gear is the TCC Slip Speed within the range specified?
-20 to +50 RPM
Go to Step 3
Go to Diagnostic Aids
Inspect for the following conditions:
The TCC apply valve stuck ON because of sediment or damage.
The TCC Sol. Valve Assy. stuck ON because of sediment or damage. Refer to Control Valve Body Assembly Inspection, in Unit Repair.
Was a condition found and corrected?
Go to Step 4
In order to verify your repair, perform the following procedure:
Using the scan tool, clear DTCs.
Operate the vehicle under the following conditions:
• The gear range is D2, D3 or D4.
• The commanded gear is not 1st.
• The engine speed is greater than 500 RPM for 5 seconds.
• Not in fuel shut off.
• The engine torque is 95-270 N·m (70-200 lb ft).
• The throttle position is 14-50%.
• The PCM commands the TCC OFF.
• The TCC slip speed is 150-2000 RPM for 5 seconds.
• The engine speed is 800-4000 RPM.
• The vehicle speed is 32-112 km/h (20-70 mph).
• The speed ratio is 0.65-1.18.
• The last gear change occurred more than 3 seconds ago.
Select Specific DTC. Enter DTC P0742.
Has the test run and passed?
Begin the diagnosis again. Go to Step 1
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