surferpi Posted August 11, 2011 Report Share Posted August 11, 2011 Hi New to this forum I was wondering if anyone can help me with a problem, I have a 2004 caddilac SRX, with the 4.6 Northstar, rear wheel drive, I have problmes with hard shift, on all gears, they go into all the gears but it is hard, the engine light is on and receive the codes PO 1825 and PO 1826 power train codes, P1825 - Internal Mode Switch - Invalid Range and P1826 - Internal Mode Switch Circuit C - High just wanted to know if anyone else has come across the codes before with a similar problem Thanks Dennis Link to comment Share on other sites More sharing options...
Cadillac Jim Posted August 12, 2011 Report Share Posted August 12, 2011 Looking at the range of codes that include P1825 and P1826, P1815 Transmission Range Switch - Start In Wrong Range P1816 TFP Valve Position Sw. - Park/Neu. With Drive Ratio P1817 TFP Valve Position Sw. - Reverse With Drive Ratio P1818 TFP Valve Position Sw. - Drive Without Drive Ratio P1819 Internal Mode Switch - No Start\Wrong Range P1820 Internal Mode Switch Circuit A Low P1822 Internal Mode Switch Circuit B High P1823 Internal Mode Switch Circuit P Low P1825 Internal Mode Switch - Invalid Range P1826 Internal Mode Switch Circuit C - High P1831 Pressure Control (PC) Solenoid Power Circuit - Low Voltage P1832 Pressure Control (PC)/Shift Lock Solenoid Control Circuit High Voltage P1833 A/T Solenoids Power Circuit - Low Voltage P1834 Torque Converter Clutch (TCC)/Shift Solenoid (SS) Control Circuit High Voltage it looks like one of your mode switches is shorted to the power line. I know little about your particular automatic transmission so someone else will need to step in here to tell you whether this is a likely wiring problem or whether you need to replace some transmission innards, and how much of a problem it is to fix. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
WarrenJ Posted August 13, 2011 Report Share Posted August 13, 2011 A P1825 DTC will result in the TCM commanding maximum transmission line pressure as a safety measure for self protection. That pretty much explains the "hard shifts." From a DIY point of view you're pretty much limited to removing, inspecting, and reseating the 20 pin electrical connector on the transmission. If you don't have a connector or wiring harness problem the odds favor the shift position switch inside the transmission being bad. That's a job for the transmission shop. It involves dropping the exhaust, transmission pan and such. Regards, Warren There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises Link to comment Share on other sites More sharing options...
Aquila Posted August 13, 2011 Report Share Posted August 13, 2011 I need to find the trouble codes for a 1991 caddy eldoredo My car runs but will did all of a sudded Thanks Donna Link to comment Share on other sites More sharing options...
adallak Posted August 13, 2011 Report Share Posted August 13, 2011 I need to find the trouble codes for a 1991 caddy eldoredo My car runs but will did all of a sudded Thanks Donna 1. Turn ignition ON 2. Press WARMER and OFF simultaneously for a few seconds until trouble codes show up on driver information center. 3. Write them down 4. Turn ignition OFF 5. Repeat the procedure if you missed some codes. 6. Post here what you found. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
surferpi Posted August 15, 2011 Author Report Share Posted August 15, 2011 Okay Thanks for all the help Dennis Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.