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2004 cadillac cts dtc p1779, p1780, p1795, p2176 after tcm replaced

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Posted on Jan 02, 2017

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perkins48
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SOURCE: p1779 p1780 p1795 p0700 p2176

Trouble Code: P0700

Malfunction Indicator Lamp Circuit Malfunction (TCM)

Possible Causes:


MIL control circuit is shorted to ground.Check the TCM for any trouble codes in memory that are responsible for the request to turn on the MIL.TCM has failed.Trouble Code: P1780

Engine Torque Signal Circuit Malfunction

Possible Causes:


.Perform the Diagnostic System Check for the Engine Controls.TCM needs to be replaced.Trouble Code: P1795

Throttle Plate Position Invalid Data Received

Possible Causes:


Perform the Diagnostic System Check for the Engine Controls.TCM may need to be replaced to repair this trouble code.Trouble Code: P2176

Throttle Position Sensor Minimum Position Not Detected

Possible Causes:


TAC motor control circuit (one or more) open or shorted to B+.TAC motor control circuit (one or more) shorted to ground.Throttle valves not at the "rest" position.Throttle valve are binding open, or are binding closed.Throttle valves moving open or closed without spring pressure.TP connector is damaged, open or shorted.Throttle body assembly is damaged or it has failed.PCM has failed.Couldn't find code P1779.

Posted on Nov 17, 2012

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P1780 means what on a 2002 saturn L300.... And how do you fix it


DTC P1780
Circuit Description
This DTC indicates that the engine control module (ECM) received a message from the transmission control module (TCM) to turn ON the MIL (SERVICE ENGINE SOON) telltale due to a transmission related OBD II failure. The ECM will send a message via the controller area network (CAN) link to the body control module (BCM), which will send a message over the class 2 link to the instrument panel (I/P) cluster to turn ON the MIL.
Conditions for Setting the DTC
DTC P1780 will set if the ECM received a MIL request message from the TCM over the CAN link.
DTC P1780 is a type B DTC.
Diagnostic Aids
DTC P1780 does not indicate a fault with the CAN link circuit.
DTC P1780 does not indicate a fault with the ECM.
Diagnose any TCM related DTCs first.


You need a scan tool that can read transmission control module codes .

Jun 22, 2018 | Saturn Cars & Trucks

1 Answer

I have a 2003 Cadillac cts getting codes p1795 p1780 p1779 p2176 what can be possible problems to fix them?


code p 2176 refers to throttle actuator control(TAC) system--idle position not learned ===causes basic setting not carried out
code p 1795 is CAN bus--throttle body position
code p 1780 is park/neutral position (PNP) switch circuit engine torque signal circuit
code p 1779 is engine torque delivered to TCM signal
go google and type in cadillac fault codes and find a site that has all the codes listed

Oct 03, 2016 | 2003 Cadillac CTS

1 Answer

2003 saturn L300 p1780


DTC P1780 (3.0L (L81))

To improve shift feel, the transmission control module (TCM) may request that the engine control module (ECM) reduce engine torque during shift events. When such a request is received, the ECM responds by retarding the base ignition timing and notifying the TCM that the request has succeeded. If the ECM is unable to comply with the request, the ECM sends the TCM a message that the request has failed.
The torque reduction request is sent to the ECM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM. A fault in the CAN will not cause DTC P1780 to set by itself. If a CAN fault occurs, other DTCs will set before DTC P1780.
When the TCM receives a torque reduction failure message from the ECM, then DTC P1780 will set. DTC P1780 is a type C DTC. Take your pick of which you think this code is for , this or the TSB - technical service bulletin. What need to hook up scan tool an data PID'S - Do you know what PID'S are ? sensor data read on a scan tool .

Mar 04, 2016 | 2003 Saturn L-Series

1 Answer

P1779 p1780 p1795 p0700 p2176


Trouble Code: P0700

Malfunction Indicator Lamp Circuit Malfunction (TCM)

Possible Causes:


MIL control circuit is shorted to ground.Check the TCM for any trouble codes in memory that are responsible for the request to turn on the MIL.TCM has failed.Trouble Code: P1780

Engine Torque Signal Circuit Malfunction

Possible Causes:


.Perform the Diagnostic System Check for the Engine Controls.TCM needs to be replaced.Trouble Code: P1795

Throttle Plate Position Invalid Data Received

Possible Causes:


Perform the Diagnostic System Check for the Engine Controls.TCM may need to be replaced to repair this trouble code.Trouble Code: P2176

Throttle Position Sensor Minimum Position Not Detected

Possible Causes:


TAC motor control circuit (one or more) open or shorted to B+.TAC motor control circuit (one or more) shorted to ground.Throttle valves not at the "rest" position.Throttle valve are binding open, or are binding closed.Throttle valves moving open or closed without spring pressure.TP connector is damaged, open or shorted.Throttle body assembly is damaged or it has failed.PCM has failed.Couldn't find code P1779.

Nov 17, 2012 | 2003 Cadillac CTS

1 Answer

Reduced power ilumnated service engine soon & service wrench lights on


Hi there:
Sound like a electrical problem there...


DTC P1779 - Engine Torque Delivered to TCM Signal
Engine torque signal below lower limit delivered to TCM. I've read these occur when there is a communication problem between ECM and TCM (Transmission Control Module).

DTC P1791 - Transmission Control Module LoopThe P1779 and P1791 codes set as a result of the other DTC (P0128). When the ECM sets certain trouble codes, these codes will set in the TCM (Transmission Control Module). The TCM will also increase tranmission pressures, which results in the harsh shifting.


DTC P0123 - Throttle/Pedal Position Sensor/Switch "A" Circuit HighTP sensor signal circuit is shorted to sensor ground. TP sensor signal circuit is open (except 1996-1998 models). TP sensor VREF circuit is open between sensor and PCM. TP sensor is damaged or it failed (it may be shorted).


DTC P0222 - Throttle/Pedal Position Sensor/Switch "B" Circuit LowThe Throttle control module contains two throttle position (TP) sensors with a common 5 volt supply, a common ground, and two independent signal circuits that vary resistance according to changes in throttle plate position. The ECM measures the signal voltage from each TP sensor, which is a reduced value of the ECM 5 volt reference. As the throttle plate opens from 0% throttle to wide open throttle, the voltage on the TP sensor 1 signal increases from 0.6 (+/-0.2) volts to 4.3 (+/-0.2) volts, while the voltage on the TP sensor 2 signal decreases from 4.4 (+/-0.2) volts to 0.76 (+/-0.2) volts.

If both P0122 and P0222 are set, circuit 486 may be either open or shorted to ground.

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Thank you for using FixYa, have a nice day.

Jun 21, 2012 | 2000 Saturn LW

1 Answer

Saturn lw2 stuck in limp mode


Hi there:DTC P1779 - Engine Torque Delivered to TCM Signal
Engine torque signal below lower limit delivered to TCM. I've read these occur when there is a communication problem between ECM and TCM (Transmission Control Module).
DTC P1791 - Transmission Control Module LoopThe P1779 and P1791 codes set as a result of the other DTC (P0128). When the ECM sets certain trouble codes, these codes will set in the TCM (Transmission Control Module). The TCM will also increase tranmission pressures, which results in the harsh shifting.


DTC P0123 - Throttle/Pedal Position Sensor/Switch "A" Circuit HighTP sensor signal circuit is shorted to sensor ground. TP sensor signal circuit is open (except 1996-1998 models). TP sensor VREF circuit is open between sensor and PCM. TP sensor is damaged or it failed (it may be shorted).


DTC P0222 - Throttle/Pedal Position Sensor/Switch "B" Circuit LowThe Throttle control module contains two throttle position (TP) sensors with a common 5 volt supply, a common ground, and two independent signal circuits that vary resistance according to changes in throttle plate position. The ECM measures the signal voltage from each TP sensor, which is a reduced value of the ECM 5 volt reference. As the throttle plate opens from 0% throttle to wide open throttle, the voltage on the TP sensor 1 signal increases from 0.6 (+/-0.2) volts to 4.3 (+/-0.2) volts, while the voltage on the TP sensor 2 signal decreases from 4.4 (+/-0.2) volts to 0.76 (+/-0.2) volts.

If both P0122 and P0222 are set, circuit 486 may be either open or shorted to ground.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jun 21, 2012 | Saturn L-Series Cars & Trucks

1 Answer

I have a 203 caddilac cts,and codes #1779 1795 1780 po700, i would like to know what the codes are.


po700 Transmission Control Module Requested Malfunction Indicator Lamp Illumination, p1779Engine Torque Delivered To Transmission Control Module, Signal p1780 Engine Torque Reduction Signal Circuit p1795 Controller Area Network Bus Throttle Body Position

Sep 18, 2011 | Cadillac CTS Coupe Cars & Trucks

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