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P1B13 on the 2015 Dodge Challenger

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. Its meaning is in the manufacturer's service information.

Bulletins for this model year that name P1B13
S2621000003 REV.A2026-03-18. Service bulletin. The vehicle will exhibit a service transmission/check engine warning indicator for the following transmission models: 845RE, 8HP45, 850RE, 8HP50, 8HP70, 8HP75, 8HP75-PHEV, 8HP75-LCV, 8HP90, 8HP95. Transmissions may exhibit the following diagnostic codes: P07E4, P1DB2, P0716, P1B14, P0733, P1D90, P1DB7, P1B13.
21-019-162022-08-08. Service bulletin. Flash: Transmission Shift And Drivability Enhancements This bulletin involves reprogramming of the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience an erroneous Malfunction Indicator Lamp (MIL) Illumination. Upon further investigation, the technician may find a Diagnostic Trouble Code (DTC) stored in the TCM memory. 3.6L Engine (Sales Code ERB) with 845RE Transmission (Sales Code DFL): · **Improved shift quality.** · P1DCD - TCM monitoring processor performance multiple clutches locked up. · P1B13 - Park-By-Wire unintended out of park position. · P0734 - Gear 4 Shift Incorrect Ratio. 3.6L Engine (Sales Code ERB) with 8HP45 Transmission (Sales Code DFG): · **Improved shift quality.** · Harsh 2-1 downshift or bump at low speeds. · P0734 - Gear 4 Shift Incorrect Ratio. 3.0L Engine (Sales Code EHD) with 845RE Transmission (Sales Code DFL): · **Improved shift quality.** · P1DCD - TCM monitoring processor performance multiple clutches locked up. · P1B13 - Park-By-Wire unintended out of park position.
21-006-15 REV-B2018-11-26. Service bulletin. Flash: 845RE Transmission Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience one or more of the following Symptom/Condition(s) and/or a Malfunction Indicator Lamp (MIL) due to an erroneous Diagnostic Trouble Code (DTC): ? P1DCD - TCM monitoring processor performance multiple clutches locked up. ? P1B13 - Park-By-Wire unintended out of park position. ? P0734 - Gear 4 Shift Incorrect Ratio set in the TCM memory. ? Harsh or erratic 8-6 downshift during freeway driving. ? Harsh or erratic 6-4 and/or 6-3 downshift during city driving. ? Harsh or erratic upshifts while in Sport Mode. ? Less than desired downshift timing (longer time to downshift than expected). ? Less than desired downshift feel during coasting decelerations and while passing. ? Less than desired shift feel when shifting from reverse to drive or drive to reverse while the vehicle is stationary (i.e. garage shift). ? Less than desired upshift feel during normal non-aggressive driving. ? Less than desired powertrain performance at higher altitudes. ? Less than desired paddle shifter operation.
21-019-162018-06-11. Service bulletin. Flash: Transmission Shift And Drivability Enhancements This bulletin involves reprogramming of the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience an erroneous Malfunction Indicator Lamp (MIL) Illumination. Upon further investigation, the technician may find a Diagnostic Trouble Code (DTC) stored in the TCM memory. 3.6L Engine (Sales Code ERB) with 845RE Transmission (Sales Code DFL): · **Improved shift quality.** · P1DCD - TCM monitoring processor performance multiple clutches locked up. · P1B13 - Park-By-Wire unintended out of park position. · P0734 - Gear 4 Shift Incorrect Ratio. 3.6L Engine (Sales Code ERB) with 8HP45 Transmission (Sales Code DFG): · **Improved shift quality.** · Harsh 2-1 downshift or bump at low speeds. · P0734 - Gear 4 Shift Incorrect Ratio. 3.0L Engine (Sales Code EHD) with 845RE Transmission (Sales Code DFL): · **Improved shift quality.** · P1DCD - TCM monitoring processor performance multiple clutches locked up. · P1B13 - Park-By-Wire unintended out of park position.
21-041-172017-11-03. Service bulletin. Flash: Transmission Diagnostic and Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) 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. This software update will also address some symptom/conditions listed below:3.6L Engine (Sales Code ERB) with 845RE Transmission (Sales Code DFL):During a Flash Over The Air (FOTA) radio update, the transmission shift points will default to higher shift points. The transmission will shift at high engine Revolutions Per Minute (RPM) and 7th and 8th gears may be blocked (LA and LD). Improved shift quality. P1DCD - TCM Monitoring Processor Performance Multiple Clutches Locked Up. P1B13 - Park-By-Wire Unintended Out Of Park Position. P0734 - Gear 4 Shift Incorrect Ratio. 3.6L Engine (Sales Code ERB) with 8HP45 Transmission (Sales Code DFG):During a FOTA radio update, the transmission shift points will default to higher shift points. The transmission will shift at high engine RPM and 7th and 8th gears may be blocked (LA and LD). Improved shift quality. Harsh 2-1 Downshift Or Bump At Low Speeds. P0734 - Gear 4 Shift Incorrect Ratio. 3.0L Engine (Sales Code EHD) with 845RE Transmission (Sales Code DFL):Improved shift quality. P1DCD - TCM Monitoring Processor Performance Multiple Clutches Locked Up. P1B13 - Park-By-Wire Unintended Out Of Park Position.
21-019-162016-09-14. Service bulletin. "FLASH: TRANSMISSION SHIFT AND DRIVABILITY ENHANCEMENTS THIS BULLETIN INVOLVES REPROGRAMMING OF THE TRANSMISSION CONTROL MODULE (TCM) WITH THE LATEST AVAILABLE SOFTWARE. A SMALL NUMBER OF CUSTOMERS MAY EXPERIENCE AN ERRONEOUS MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATION. UPON FURTHER INVESTIGATION, THE TECHNICIAN MAY FIND A DIAGNOSTIC TROUBLE CODE (DTC) STORED IN THE TCM MEMORY. 3.6L ENGINE (SALES CODE ERB) WITH 845RE TRANSMISSION (SALES CODE DFL): · **IMPROVED SHIFT QUALITY.** · P1DCD - TCM MONITORING PROCESSOR PERFORMANCE MULTIPLE CLUTCHES LOCKED UP. · P1B13 - PARK-BY-WIRE UNINTENDED OUT OF PARK POSITION. · P0734 - GEAR 4 SHIFT INCORRECT RATIO. 3.6L ENGINE (SALES CODE ERB) WITH 8HP45 TRANSMISSION (SALES CODE DFG): · **IMPROVED SHIFT QUALITY.** · HARSH 2-1 DOWNSHIFT OR BUMP AT LOW SPEEDS. · P0734 - GEAR 4 SHIFT INCORRECT RATIO. 3.0L ENGINE (SALES CODE EHD) WITH 845RE TRANSMISSION (SALES CODE DFL): · **IMPROVED SHIFT QUALITY.** · P1DCD - TCM MONITORING PROCESSOR PERFORMANCE MULTIPLE CLUTCHES LOCKED UP. · P1B13 - PARK-BY-WIRE UNINTENDED OUT OF PARK POSITION."

6 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.