P0847 Fluid Pressure Switch B Circuit Low
P0847 Duramax
Monitor the OBD status for P0847 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail. Does the result indicate FAILED? NO - Intermittent failure, the system is OK at this time. Check the OP3SW (BLK/RED) wire for an intermittent short to ground between the 3rd clutch transmission fluid pressure switch and the PCM. Transmission Fluid Pressure Switch 2 Circuit Low (P0847) TCU: 5893: 3: Transmission Fluid Pressure Switch 3 Circuit High (P0873) TCU: 5893: 4: Transmission Fluid Pressure Switch 3 Circuit Low (P0872) TCU: 5894: 3: Transmission Fluid Pressure Switch 4 Circuit High (P0878) TCU: 5894: 4: Transmission Fluid Pressure Switch 4 Circuit Low (P0877) TCU. P0847 Meaning The Transmission Control Module (TCM) monitors the Transmission Fluid Pressure Sensor/Switch signal. The TCM sets the OBDII code when the Transmission Fluid Pressure Sensor/Switch is not to factory specifications.
| Source Module | SPN | FMI | Description |
|---|---|---|---|
| TCU | 36 | 7 | Unexpected Mechanical Gear Disengagement (P0894) |
| TCU | 91 | 3 | Pedal Position Sensor Circuit High Voltage (P0123) |
| TCU | 91 | 4 | Pedal Position Sensor Circuit Low Voltage (P0122) |
| TCU | 91 | 8 | Throttle Position Sensor PWM Signal Low (P1891) or High (P1892) |
| TCU | 110 | 3 | Engine Coolant Temperature Sensor 2 Circuit High (P2185) |
| TCU | 110 | 4 | Engine Coolant Temperature Sensor 2 Circuit Low (P2184) |
| TCU | 116 | 21 | RELS Input Failed On (P071A) |
| TCU | 119 | 3 | Retarder Pressure Sensor Circuit High (P0990) |
| TCU | 119 | 4 | Retarder Pressure Sensor Circuit Low (P0989) |
| TCU | 120 | 3 | Retarder Oil Temperature Sensor Circuit High (P2743) |
| TCU | 120 | 4 | Retarder Oil Temperature Sensor Circuit Low (P2742) |
| TCU | 120 | 15 | Transmission Retarder Oil Temperture Too High |
| TCU | 158 | 4 | System Voltage Low (P0562) |
| TCU | 168 | 2 | TCM Power Input Signal Performance (P0881) |
| TCU | 168 | 3 | Terminal 30, battery voltage; nominal range exceeded |
| TCU | 168 | 4 | TCM Power Input Signal Low (P0882) |
| TCU | 168 | 14 | TCM Power Input Signal (P0880) |
| TCU | 177 | 0 | Transmission Oil Temperature Data Valid But Above Normal Operational Range - Most Severe Level |
| TCU | 177 | 2 | Transmission Fluid Temperature Sensor Circuit Performance (P0711 ) |
| TCU | 177 | 3 | Transmission Fluid Temperature Sensor Circuit High (P0713) |
| TCU | 177 | 4 | Transmission Fluid Temperature Sensor Circuit Low (P0712) |
| TCU | 177 | 15 | RETARDER OIL TEMP |
| TCU | 190 | 2 | Engine Speed Sensor Circuit Performance (P0726) |
| TCU | 190 | 14 | Engine Speed Sensor Circuit (P0725) |
| TCU | 190 | 21 | Engine Speed Sensor Circuit No Signal (P0727) |
| TCU | 191 | 2 | Output Shaft Speed Sensor Circuit Performance (P0721) |
| TCU | 191 | 14 | Output Shaft Speed Sensor Circuit (P0720) |
| TCU | 191 | 21 | Output Shaft Speed Sensor Circuit No Signal (P0722) |
| TCU | 513 | 7 | Torque Management Feedback Signal A (P2637) or Signal B (P2641) |
| TCU | 573 | 21 | Torque Converter Clutch (TCC) System Stuck Off (P0741) |
| TCU | 597 | 2 | Brake Switch Circuit (P0703) |
| TCU | 628 | 31 | Control Module Random Access Memory (RAM) (P0604) |
| TCU | 630 | 13 | TCM Not Programmed (P0602) |
| TCU | 740 | 3 | Torque Converter Clutch (TCC) Pressure Control Solenoid (PCS) Control Circuit High (P2763) |
| TCU | 740 | 4 | Torque Converter Clutch (TCC) Pressure Control Solenoid (PCS) Control Circuit Low (P2764) |
| TCU | 740 | 5 | Torque Converter Clutch (TCC) Pressure Control Solenoid (PCS) Control Circuit/Open (P2761) |
| TCU | 747 | 31 | Torque Control Data Mismatch - ECM/TCM (P0614) |
| TCU | 750 | 2 | Turbine Shaft Speed Sensor Circuit Performance (P0716) |
| TCU | 750 | 14 | Turbine Shaft Speed Sensor Circuit (P0715) |
| TCU | 750 | 21 | Turbine Shaft Speed Sensor Circuit No Signal (P0717) |
| TCU | 751 | 2 | Gear Shift Module 1 Invalid Data (U0404) |
| TCU | 751 | 8 | Gear Shift Direction Circuit (P2793) |
| TCU | 751 | 9 | Lost Communication with Gear Shift Module 1 (U0103) |
| TCU | 751 | 13 | Gear Shift Module 1 Calibration Invalid (P1790) |
| TCU | 751 | 14 | Transmission Range Sensor Circuit High (P0708) |
| TCU | 751 | 31 | Gear Shift Module 1 Incompatible (U0304) |
| TCU | 752 | 2 | Gear Shift Module 2 Invalid Data (U0592) |
| TCU | 752 | 9 | Lost Communication with Gear Shift Module 2 (U0291) |
| TCU | 752 | 13 | Gear Shift Module 2 Calibration Invalid (P1791) |
| TCU | 752 | 31 | Gear Shift Module 2 Incompatible (U0333) |
| TCU | 753 | 2 | General Purpose Input Fault (P071D) |
| TCU | 785 | 14 | Transmission Control System Performance (P0701) |
| TCU | 837 | 2 | Conditioned Output Shaft Speed Circuit (P1870 ) |
| TCU | 880 | 3 | Stop Lamp Circuit (Red) Voltage Above Normal, Or Shorted To High Source |
| TCU | 880 | 5 | Stop Lamp Circuit (Red) Current Below Normal Or Open Circuit |
| TCU | 928 | 5 | Axle Location Current Below Normal Or Open Circuit |
| TCU | 1716 | 3 | Retarder Request Sensor Circuit High (C1313) |
| TCU | 1716 | 4 | Retarder Request Sensor Circuit Low (C1312) |
| TCU | 2000 | 9 | Lost Communications with ECM A (U0100) |
| TCU | 2003 | 11 | Transmission Range Sensor Circuit Performance (P0706) |
| TCU | 2003 | 12 | Control Module Performance (P0607) |
| TCU | 2003 | 31 | GENERAL TRANSMISSION FAULT |
| TCU | 2796 | 2 | Four Wheel Drive (4WD) Switch Circuit Range/Performance (P0837) |
| TCU | 2900 | 3 | Crank Enable Circuit High (P081B) |
| TCU | 2900 | 4 | Crank Enable Circuit Low (P081A ) |
| TCU | 2908 | 2 | Main Pressure Modulation Solenoid System Performance (P0961) |
| TCU | 2908 | 3 | Main Pressure Modulation Solenoid Control Circuit High (P0963) |
| TCU | 2908 | 4 | Main Pressure Modulation Solenoid Control Circuit Low (P0962) |
| TCU | 2908 | 5 | Main Pressure Modulation Solenoid Control Circuit Open (P0960) |
| TCU | 3027 | 3 | Transmission Fluid Level Sensor Circuit High (P070D) |
| TCU | 3027 | 4 | Transmission Fluid Level Sensor Circuit Low (P070C) |
| TCU | 3359 | 1 | Transmission Filter Maintenance Required (P088B) |
| TCU | 3359 | 16 | Transmission Filter Maintenance Alert (P088A) |
| TCU | 3359 | 31 | Transmission Service (Filter Life Monitor) |
| TCU | 3509 | 2 | Sensor Reference Voltage 'A' Circuit (4) (P0642) |
| TCU | 3509 | 3 | Sensor Reference Voltage 'A' Circuit High (P0643 ) |
| TCU | 4177 | 1 | Transmission Fluid Deteriorated (P0897) |
| TCU | 4177 | 17 | Transmission Service (Oil Life Monitor) |
| TCU | 4178 | 31 | Transmission Service (Transmission Health Monitor) |
| TCU | 5876 | 2 | Incorrect Low Gear Ratio (P1739) |
| TCU | 5877 | 2 | Incorrect 1st Gear Ratio (P0731) |
| TCU | 5878 | 2 | Incorrect 2nd Gear Ratio (P0732) |
| TCU | 5879 | 2 | Incorrect 3rd Gear Ratio (P0733) |
| TCU | 5880 | 2 | Incorrect 4th Gear Ratio (P0734) |
| TCU | 5881 | 2 | Incorrect 5th Gear Ratio (P0735) |
| TCU | 5882 | 2 | Incorrect 6th Gear Ratio (P0729) |
| TCU | 5887 | 2 | Incorrect Reverse Ratio (P0736) |
| TCU | 5888 | 2 | Incorrect Reverse 2 Ratio (P077F) |
| TCU | 5891 | 3 | Transmission Fluid Pressure Switch 1 Circuit High (P0843) |
| TCU | 5891 | 4 | Transmission Fluid Pressure Switch 1 Circuit Low (P0842) |
| TCU | 5892 | 3 | Transmission Fluid Pressure Switch 2 Circuit High (P0848) |
| TCU | 5892 | 4 | Transmission Fluid Pressure Switch 2 Circuit Low (P0847) |
| TCU | 5893 | 3 | Transmission Fluid Pressure Switch 3 Circuit High (P0873) |
| TCU | 5893 | 4 | Transmission Fluid Pressure Switch 3 Circuit Low (P0872) |
| TCU | 5894 | 3 | Transmission Fluid Pressure Switch 4 Circuit High (P0878) |
| TCU | 5894 | 4 | Transmission Fluid Pressure Switch 4 Circuit Low (P0877) |
| TCU | 5900 | 3 | Pressure Control Solenoid (PCS) 1 Control Circuit High (P2730) |
| TCU | 5900 | 4 | Pressure Control Solenoid (PCS) 1 Control Circuit Low (P2729) |
| TCU | 5900 | 5 | Pressure Control Solenoid (PCS) 1 Control Circuit Open (P2727) |
| TCU | 5900 | 20 | Pressure Control Solenoid (PCS) 1 Stuck On (P2724) |
| TCU | 5900 | 21 | Pressure Control Solenoid (PCS) 1 Stuck Off (P2723) |
| TCU | 5901 | 3 | Pressure Control Solenoid (PCS) 2 Control Circuit High (P0967) |
| TCU | 5901 | 4 | Pressure Control Solenoid (PCS) 2 Control Circuit Low (P0966) |
| TCU | 5901 | 5 | Pressure Control Solenoid (PCS) 2 Control Circuit Open (P0964) |
| TCU | 5901 | 20 | Pressure Control Solenoid (PCS) 2 Stuck On (P0777) |
| TCU | 5901 | 21 | Pressure Control Solenoid (PCS) 2 Stuck Off (P0776) |
| TCU | 5902 | 3 | Pressure Control Solenoid (PCS) 3 Control Circuit High (P0971) |
| TCU | 5902 | 4 | Pressure Control Solenoid (PCS) 3 Control Circuit Low (P0970) |
| TCU | 5902 | 5 | Pressure Control Solenoid (PCS) 3 Control Circuit Open (P0968) |
| TCU | 5902 | 20 | Pressure Control Solenoid (PCS) 3 Stuck On (P0797) |
| TCU | 5902 | 21 | Pressure Control Solenoid (PCS) 3 Stuck Off (P0796) |
| TCU | 5903 | 3 | Pressure Control Solenoid (PCS) 4 Control Circuit High (P2721) |
| TCU | 5903 | 4 | Pressure Control Solenoid (PCS) 4 Control Circuit Low (P2720) |
| TCU | 5903 | 5 | Pressure Control Solenoid (PCS) 4 Control Circuit Open (P2718) |
| TCU | 5903 | 20 | Pressure Control Solenoid (PCS) 4 Stuck On (P2715) |
| TCU | 5903 | 21 | Pressure Control Solenoid (PCS) 4 Stuck Off (P2714) |
| TCU | 5904 | 3 | Pressure Control Solenoid (PCS) 5 Control Circuit High (P2739) |
| TCU | 5904 | 4 | Pressure Control Solenoid (PCS) 5 Control Circuit Low (P2738) |
| TCU | 5904 | 5 | Pressure Control Solenoid (PCS) 5 Control Circuit Open (P2736) |
| TCU | 5905 | 3 | Pressure Control Solenoid (PCS) 6 Control Circuit High (P2815) |
| TCU | 5905 | 4 | Pressure Control Solenoid (PCS) 6 Control Circuit Low (P2814) |
| TCU | 5905 | 5 | Pressure Control Solenoid (PCS) 6 Control Circuit Open (P2812) |
| TCU | 5905 | 20 | Pressure Control Solenoid (PCS) 6 Stuck On (P2809) |
| TCU | 5905 | 21 | Pressure Control Solenoid (PCS) 6 Stuck Off (P2808) |
| TCU | 5908 | 3 | Shift Solenoid 1 Control Circuit High (P0974) |
| TCU | 5908 | 4 | Shift Solenoid 1 Control Circuit Low (P0973) |
| TCU | 5908 | 5 | Shift Solenoid 1 Control Circuit Open (P097A) |
| TCU | 5908 | 20 | Shift Solenoid 1 Valve Performance - Stuck On (P0752) |
| TCU | 5908 | 21 | Shift Solenoid 1 Valve Performance - Stuck Off (P0751) |
| TCU | 5909 | 3 | Shift Solenoid 2 Control Circuit High (P0977) |
| TCU | 5909 | 4 | Shift Solenoid 2 Control Circuit Low (P0976) |
| TCU | 5909 | 5 | Shift Solenoid 2 Control Circuit Open (P097B) |
| TCU | 5909 | 20 | Shift Solenoid 2 Valve Performance - Stuck On (P0757) |
| TCU | 5909 | 21 | Shift Solenoid 2 Valve Performance - Stuck Off (P0756) |
| TCU | 5910 | 3 | Shift Solenoid 3 Control Circuit High (P0980) |
| TCU | 5910 | 4 | Shift Solenoid 3 Control Circuit Low (P0979) |
| TCU | 5910 | 5 | Shift Solenoid 3 Control Circuit Open (P097C) |
| TCU | 5910 | 20 | Shift Solenoid 3 Valve Performance - Stuck On (P0762) |
| TCU | 5910 | 21 | Shift Solenoid 3 Valve Performance - Stuck Off (P0761) |
| TCU | 5912 | 0 | TCM Internal Temperature Too High (P0634) |
| TCU | 6597 | 9 | CAN Communication Bus 1 Off (U0073) |
| TCU | 6598 | 9 | CAN Communication Bus 2 Off (U0074) |
| TCU | 6822 | 3 | Actuator Supply Circuit Voltage 1 High (HSD 1) (P0659) |
| TCU | 6822 | 4 | Actuator Supply Circuit Voltage 1 Low (HSD 1) (P0658) |
| TCU | 6822 | 5 | Actuator Supply Circuit Voltage 1 Open (HSD 1) (P0657) |
| TCU | 6823 | 3 | Actuator Supply Circuit Voltage 2 High (HSD 2) (P2671) |
| TCU | 6823 | 4 | Actuator Supply Circuit Voltage 2 Low (HSD 2) (P2670) |
| TCU | 6823 | 5 | Actuator Supply Circuit Voltage 2 Open (HSD 2) (P2669) |
| TCU | 6824 | 3 | Actuator Supply Circuit Voltage 3 High (HSD 3) (P2686) |
| TCU | 6824 | 4 | Actuator Supply Circuit Voltage 3 Low (HSD 3) (P2685) |
| TCU | 6824 | 5 | Actuator Supply Circuit Voltage 3 Open (HSD 3) (P2684) |
| TCU | 10012 | 1 | Not system functions - it just shows up here because of the SPNs being in range |
| TCU | 18043 | 31 | Not system functions - it just shows up here because of the SPNs being in range |
| TCU | 521231 | 31 | Internal Control Module Keep Alive Memory Error (P0603 ) |