# C121C on the 2017 Chrysler Pacifica

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name C121C

- [10228115](https://open.wenmarpro.com/bulletins/10228115), 2022-12-19: Flash: 3.6L Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module \(PCM\) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and/or one of the following conditions. Upon further investigation, a technician may find the following Diagnostic Trouble Code \(DTC\) stored in the Anti\-lock Brake System \(ABS\) Module memory: NOTE: The Diagnostic Trouble Code \(DTC\) is caused by a calibration in the PCM that is in conflict with the ABS Module programming. The new software flash will correct this issue. · C121C\-00 \- Torque Request Signal Denied.
- [10224733](https://open.wenmarpro.com/bulletins/10224733), 2022-10-24: Flash: Powertrain Diagnostic and System Enhancements This bulletin involves reprogramming the Powertrain Control Module \(PCM\) with thelatest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation, a technician may find the following DiagnosticTrouble Codes \(DTCs\) have been set:U1400\-00 \- Implausible TPS Signal Received P1D73 \- AGS Performance \-\(Active Grill Shutter\). P0171 \- Fuel System 1/1 Lean. P0174 \- Fuel System 2/1 Lean. The following Diagnostic Trouble Codes \(DTCs\) have been changed from a one trip fault to atwo trip fault:P0335 \- Crankshaft Position Sensor Circuit. P0339 \- Crankshaft Position Sensor Intermittent. P0340 \- Camshaft Position Sensor Circuit \- Bank 1 Sensor 1. P0344 \- Camshaft Position Sensor Intermittent \- Bank 1 Sensor 1. P0345 \- Camshaft Position Sensor Circuit \- Bank 2 Sensor 1. P0349 \- Camshaft Position Sensor Intermittent \- Bank 2 Sensor 1. P0365 \- Camshaft Position Sensor Circuit \- Bank 1 Sensor 2. P0369 \- Camshaft Position Sensor Intermittent \- Bank 1 Sensor 2. P0390 \- Camshaft Position Sensor Circuit \- Bank 2 Sensor 2. P0394 \- Camshaft Position Sensor Intermittent \- Bank 2 Sensor 2. The technician may also find the following DTC stored in the Anti\-lock Brake System \(ABS\) Module memory:The following Diagnostic Trouble Code \(DTC\) is caused by a calibration in the PCM that is in conflict with the ABS Module programming. Thenew software flash will correct this issue.C121C\-00 \- Torque Request Signal Denied. This software release also includes:Improvement at lower ambient temperatures for Engine Stop/Start \(ESS\) Starts. Improvements to vehicle drivability during a cam sensor and/or crank sensor malfunction. Transmission quick learn. Engine enhancements.
- [10217613](https://open.wenmarpro.com/bulletins/10217613), 2022-08-08: Flash: 3.6L Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module \(PCM\) with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation, a technician may find the following Diagnostic Trouble Codes \(DTCs\) have been set: · \*\*P1D73 \- AGS Performance \- \(Active Grill Shutter\). · P0171 \- Fuel System 1/1 Lean. · P0174 \- Fuel System 2/1 Lean.\*\* The technician may also find the following DTC stored in the Anti\-lock Brake System \(ABS\) Module memory: NOTE: The Diagnostic Trouble Code \(DTC\) is caused by a calibration in the PCM that is in conflict with the ABS Module programming. The new software flash will correct this issue. · C121C\-00 \- Torque Request Signal Denied. \*\*This software release also includes: · Transmission quick learn. · Engine enhancements.\*\*
- [10181480](https://open.wenmarpro.com/bulletins/10181480), 2020-10-26: Flash: 3.6L Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module \(PCM\) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and/or one of the following conditions. Upon further investigation, a technician may find the following Diagnostic Trouble Code \(DTC\) stored in the Anti\-lock Brake System \(ABS\) Module memory: NOTE: The Diagnostic Trouble Code \(DTC\) is caused by a calibration in the PCM that is in conflict with the ABS Module programming. The new software flash will correct this issue. · C121C\-00 \- Torque Request Signal Denied.
- [10141280](https://open.wenmarpro.com/bulletins/10141280), 2018-06-18: Flash: 3.6L Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module \(PCM\) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and/or one of the following conditions. Upon further investigation, a technician may find the following Diagnostic Trouble Code \(DTC\) stored in the Anti\-lock Brake System \(ABS\) Module memory: NOTE: The Diagnostic Trouble Code \(DTC\) is caused by a calibration in the PCM that is in conflict with the ABS Module programming. The new software flash will correct this issue. · C121C\-00 \- Torque Request Signal Denied.
- [10140123](https://open.wenmarpro.com/bulletins/10140123), 2018-06-11: Flash: 3.6L Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module \(PCM\) with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation, a technician may find the following Diagnostic Trouble Codes \(DTCs\) have been set: · \*\*P1D73 \- AGS Performance \- \(Active Grill Shutter\). · P0171 \- Fuel System 1/1 Lean. · P0174 \- Fuel System 2/1 Lean.\*\* The technician may also find the following DTC stored in the Anti\-lock Brake System \(ABS\) Module memory: NOTE: The Diagnostic Trouble Code \(DTC\) is caused by a calibration in the PCM that is in conflict with the ABS Module programming. The new software flash will correct this issue. · C121C\-00 \- Torque Request Signal Denied. \*\*This software release also includes: · Transmission quick learn. · Engine enhancements.\*\*
- [10080001](https://open.wenmarpro.com/bulletins/10080001), 2016-09-14: "FLASH: 3.6L POWERTRAIN DIAGNOSTIC AND SYSTEM ENHANCEMENTS THIS BULLETIN INVOLVES REPROGRAMMING THE POWERTRAIN CONTROL MODULE \(PCM\) WITH THE LATEST AVAILABLE SOFTWARE. CUSTOMERS MAY EXPERIENCE A MALFUNCTION INDICATOR LAMP \(MIL\) ILLUMINATION. UPON FURTHER INVESTIGATION, A TECHNICIAN MAY FIND THE FOLLOWING DIAGNOSTIC TROUBLE CODES \(DTCS\) HAVE BEEN SET: · \*\*P1D73 \- AGS PERFORMANCE \- \(ACTIVE GRILL SHUTTER\). · P0171 \- FUEL SYSTEM 1/1 LEAN. · P0174 \- FUEL SYSTEM 2/1 LEAN.\*\* THE TECHNICIAN MAY ALSO FIND THE FOLLOWING DTC STORED IN THE ANTI\-LOCK BRAKE SYSTEM \(ABS\) MODULE MEMORY: NOTE: THE DIAGNOSTIC TROUBLE CODE \(DTC\) IS CAUSED BY A CALIBRATION IN THE PCM THAT IS IN CONFLICT WITH THE ABS MODULE PROGRAMMING. THE NEW SOFTWARE FLASH WILL CORRECT THIS ISSUE. · C121C\-00 \- TORQUE REQUEST SIGNAL DENIED. \*\*THIS SOFTWARE RELEASE ALSO INCLUDES: · TRANSMISSION QUICK LEARN. · ENGINE ENHANCEMENTS.\*\*"