Question about Chevrolet Silverado 1500
I am sorry to hear regarding your problem. I know it's frustrating. There is already a Technical Bulletin issued in this regard :-
Subject: MIL On, Transmission Stuck in Second or Third Gear, IPC Inoperative, DTCs P0740,P0753,P0758,P0785,P0787,P0973,P0976,P1860,P2761,P2764 and/or P2769 Set (Verify and Repair Source of Voltage Loss #01-07-30-002E - (09/23/2005)
Models: 2006 and Prior GM Passenger Cars and Light Duty Trucks 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X with 4L60-E, 4L65-E, 4L80-E or 4L85-E Automatic Transmission (RPOs M30, M32, M33, MT1, MN8)
This bulletin is being revised to update model years, add additional models and add additional diagnostic information. Please discard Corporate Bulletin Number 01-07-30-002D (Section 07 -- Transmission/Transaxle).
ConditionSome customers may comment on one or more of the following conditions:
• The Malfunction Indicator Lamp (MIL) is ON. • The transmission is defaulted to second gear (4L80/85-E). • The transmission is defaulted to third gear (4L60/65-E). • The instrument cluster is inoperative.Upon investigation, one or all of the diagnostic trouble codes (DTCs) P0740, P0753, P0758, P0785, P0787, P0973, P0976, P1860, P2761, P2764 and P2769 may be set depending on the vehicle.
CauseThe most likely cause of this condition may be a loss of voltage to the transmission solenoid power supply circuit.
This condition may also be the result of an incorrect installation of an aftermarket electronic device such as a remote starter or alarm system.
CorrectionImportant: If the vehicle is equipped with an aftermarket electronic device and the DTCs are being set when the device is being used, verify that the appropriate fuse is being supplied battery voltage during operation. If voltage is not present at this fuse, these DTCs will be set due to lack of voltage at the solenoids. This condition is most likely to occur with an incorrectly installed remote starting system. If this is the case, refer the customer to the installer of the system for corrections. ANY REPAIRS DUE TO AFTERMARKET INSTALLATION OF ACCESSORIES IS A NON-WARRANTABLE ITEM.
The General solution of P 0753 is :-
The 1-2 Shift Solenoid (SS) valve controls the fluid flow acting on the 1-2 and 3-4 shift valves. The solenoid is a normally-open exhaust valve. With the 2-3 SS valve, the 1-2 SS valve allows four different shifting combinations. The solenoid attaches to the control valve body within the transmission. The 1-2 SS valve receives ignition voltage through circuit 1020. The Powertrain Control Module (PCM) controls the solenoid by providing the ground path on circuit 1222.
When the PCM detects a continuous open, short to ground or short to power in the 1-2 SS valve circuit, then DTC P0753 sets. DTC P0753 is a type B DTC.
CONDITIONS FOR RUNNING THE DTC
DTC P0753 sets if one of the following conditions occurs for 5 seconds :
The PCM commands the solenoid ON and the voltage feedback remains high (B+).
The PCM commands the solenoid OFF and the voltage feedback remains low (0 volts ).
ACTION TAKEN WHEN THE DTC SETS
The numbers below refer to the step numbers on the diagnostic table.
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Posted on Sep 24, 2009
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Posted on Jan 02, 2017
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