{"vehicle":{"id":"2025_ram_2500","year":2025,"make":"Ram","model":"2500"},"code":"P0266","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":4,"bulletins":[{"nhtsa_id":11034323,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-07-02","date":"2026-06-19","document_id":"18-061-26","mfr_campaign":null,"component":"ENGINE","summary":"Not applicable to vehicles built for US market. SA Market Only - Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0263-00 - Cylinder 1 Contribution/Balance. ● P0266-00 - Cylinder 2 Contribution/Balance. ● P0269-00 - Cylinder 3 Contribution/Balance. ● P0272-00 - Cylinder 4 Contribution/Balance. ● P0275-00 - Cylinder 5 Contribution/Balance. ● P0278-00 - Cylinder 6 Contribution/Balance. Customers may also comment one or more of the following: ● The engine runs rough and exhibits stumbling and shaking. ● Loss of power. NOTE: The perceived loss of power is due to an insufficient injector/torque response. This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11034323-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11034323-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11034323"},{"nhtsa_id":11031678,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-04-29","date":"2026-04-22","document_id":"18-014-26 REV. A","mfr_campaign":null,"component":"ENGINE","summary":"Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● **P0088-00 - Fuel Rail Pressure Too High - Bank 1.** ● P20CF-00 - Exhaust After treatment Fuel Injector \"A\" Stuck Open. ● P20DB-00 - Exhaust After treatment Fuel Supply Control Stuck Open. ● U0109-00 - Lost Communication With Fuel Pump Control Module. ● P1451-00 - Diesel Particulate Filter System Performance. ● P2463-00 - Diesel Particulate Filter Restriction - Soot Accumulation Bank 1. ● P2459-00 - Diesel Particulate Filter Regeneration Too Frequent. ● P0087-00 - Fuel Rail Pressure Too Low. ● P2540-00 - Low Pressure Fuel System Sensor Circuit Range/performance. ● P2543-00 - Low Pressure Fuel System Sensor Circuit Intermittent. ● P214D-00 - SCR NOX Catalyst Outlet Temperature Too High During Particulate Filter Regeneration. ● P242B-00 - Exhaust Gas Temperature Sensor Circuit Performance - Bank 1 Sensor 3. ● P24DA-00 - Particulate Matter Sensor Exhaust Sample Error Bank 1. ● P20EE-00 - SCR Nox Catalyst Efficiency Below Threshold - Bank 1 Catalyst 1. ● P226C-00 - Turbocharger Boost Control \"A\" Slow Response. ● P2281-00 - Air Leak Between MAF And Throttle Body. ● P229F-00 - NOX Sensor Circuit Range/performance - Bank 1. ● P0100-00 - Mass Or Volume Air Flow Sensor \"A\" Circuit. ● P203F-00 - Reductant Level Too Low. ● P0423-00 - Heated Catalyst Efficiency Below Threshold Bank 1. ● P0263-00 - Cylinder 1 Contribution-Balance. ● P0266-00 - Cylinder 2 Contribution-Balance. ● P0269-00 - Cylinder 3 Contribution-Balance. ● P0272-00 - Cylinder 4 Contribution-Balance. ● P0275-00 - Cylinder 5 Contribution-Balance. ● P0278-00 - Cylinder 6 Contribution/Balance. ● P026B-00 - Injection Timing Performance. ● P020A-00 - Cylinder 1 Injection Timing. ● P020B-00 - Cylinder 2 Injection Timing. ● P020C-00 - Cylinder 3 Injection Timing. ● P020D-00 - Cylinder 4 Injection Timing. ● P020E-00 - Cylinder 5 Injection Timing. ● P020F-00 - Cylinder 6 Injection Timing. ● P06B9-00 - Cylinder 1 Glow Plug Circuit Performance. ● P06BA-00 - Cylinder 2 Glow Plug Circuit Performance. ● P06BB-00 - Cylinder 3 Glow Plug Circuit Performance. ● P06BC-00 - Cylinder 4 Glow Plug Circuit Performance. ● P06BD-00 - Cylinder 5 Glow Plug Circuit Performance. ● P06BE-00 - Cylinder 6 Glow Plug Circuit Performance. Customers may also comment on one or more of the following: ● Long engine crank times, particularly after fuel filter change. ● Inverter drops out when shifting from P to D gears. ● Diesel Exhaust Fluid (DEF) level gauge slow to update after a refill. ● Poor cold start performance. ● Cruise control drops out/cancels on its own. ● Engine stumble, runs rough, or a slight lack of power. The following software enhancements are also available: ● Reduce the occurrence of false faults Diagnostic Trouble Codes (DTCs) P0300-00, **P0088-00** and P0315-00. ● Improved troubleshooting and repair accuracy for air handling components through APT test in wiTECH. ● DTC P1451-00 re-tune to reduce false faults. ● Improvements to allow DTC P2509-00 faults to be cleared with wiTECH. ● Adaptive Cruise Control (ACC) software fix to prevent cruise control dropouts. ● Engine stumble fix for improved drivability. ● Engine stall detection allowing DTC P032F-00 to clear after a power cycle. ● Allow multiple PROXI rewrites. ● Enable cold re-prime (DTC P208B-00 improvement) This bulletin involves inspecting and possibly reprogramming the Engine Control Module (ECM/PCM) with the latest available software","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11031678-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11031678-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11031678"},{"nhtsa_id":11028764,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-02-12","date":"2026-02-02","document_id":"18-013-26","mfr_campaign":null,"component":"ELECTRICAL SYSTEM; ENGINE","summary":"Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● **P20CF - 00 Exhaust After treatment Fuel Injector \"A\" Stuck Open. ● P20DB - 00 Exhaust After treatment Fuel Supply Control Stuck Open. ● U0109 - 00 Lost Communication With Fuel Pump Control Module. ● P1451 - 00 Diesel Particulate Filter System Performance. ● P2463 - 00 Diesel Particulate Filter Restriction - Soot Accumulation Bank 1. ● P2459 - 00 Diesel Particulate Filter Regeneration Too Frequent.** ● P0263 - 00 Cylinder 1 Contribution/balance. ● P0266 - 00 Cylinder 2 Contribution-balance. ● P0269 - 00 Cylinder 3 Contribution/balance. ● P0272 - 00 Cylinder 4 Contribution/balance. ● P0275 - 00 Cylinder 5 Contribution/balance. ● P0278 - 00 Cylinder 6 Contribution/balance. ● P026B - 00 Injection Timing Performance. ● P020A - 00 Cylinder 1 Injection Timing. ● P020B - 00 Cylinder 2 Injection Timing. ● P020C - 00 Cylinder 3 Injection Timing. ● P020D - 00 Cylinder 4 Injection Timing. ● P020E - 00 Cylinder 5 Injection Timing. ● P020F - 00 Cylinder 6 Injection Timing. ● P06B9 - 00 Cylinder 1 Glow Plug Circuit Performance. ● P06BA - 00 Cylinder 2 Glow Plug Circuit Performance. ● P06BB - 00 Cylinder 3 Glow Plug Circuit Performance. ● P06BC - 00 Cylinder 4 Glow Plug Circuit Performance. ● P06BD - 00 Cylinder 5 Glow Plug Circuit Performance. ● P06BE - 00 Cylinder 6 Glow Plug Circuit Performance. ● P0072 - 00 Ambient Air Temperature Sensor Circuit \"A\" Low. ● P0087 - 00 Fuel Rail Pressure Too Low. ● P2540 - 00 Low Pressure Fuel System Sensor Circuit Range/Performance. ● P2543 - 00 Low Pressure Fuel System Sensor Circuit Intermittent. ● P0100 - 00 Mass Or Volume Air Flow Sensor \"A\" Circuit. B18 FSAR-TSB-6871 -2- ● P203F - 00 Reductant Level Too Low. ● P0423 - 00 Heated Catalyst Efficiency Below Threshold Bank 1. ● P20EE - 00 SCR NOX Catalyst Efficiency Belo","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028764-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028764-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11028764"},{"nhtsa_id":11024048,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-10-08","date":"2025-09-30","document_id":"18-020-25 REV. B","mfr_campaign":null,"component":"UNKNOWN OR OTHER","summary":"Flash: Powertrain Control Module (PCM) Updates *Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):** ● **P0263 - 00 Cylinder 1 Contribution/balance. ● P0266 - 00 Cylinder 2 Contribution-balance. ● P0269 - 00 Cylinder 3 Contribution/balance. ● P0272 - 00 Cylinder 4 Contribution/balance. ● P0275 - 00 Cylinder 5 Contribution/balance. ● P0278 - 00 Cylinder 6 Contribution/balance. ● P026B - 00 Injection Timing Performance. ● P020A - 00 Cylinder 1 Injection Timing. ● P020B - 00 Cylinder 2 Injection Timing. ● P020C - 00 Cylinder 3 Injection Timing. ● P020D - 00 Cylinder 4 Injection Timing. ● P020E - 00 Cylinder 5 Injection Timing. ● P020F - 00 Cylinder 6 Injection Timing. ● P06B9 - 00 Cylinder 1 Glow Plug Circuit Performance. ● P06BA - 00 Cylinder 2 Glow Plug Circuit Performance. ● P06BB - 00 Cylinder 3 Glow Plug Circuit Performance. ● P06BC - 00 Cylinder 4 Glow Plug Circuit Performance. ● P06BD - 00 Cylinder 5 Glow Plug Circuit Performance. ● P06BE - 00 Cylinder 6 Glow Plug Circuit Performance. ● P0072 - 00 Ambient Air Temperature Sensor Circuit \"A\" Low. ● P0087 - 00 Fuel Rail Pressure Too Low. ● P2540 - 00 Low Pressure Fuel System Sensor Circuit Range/Performance. ● P2543 - 00 Low Pressure Fuel System Sensor Circuit Intermittent. ● P0100 - 00 Mass Or Volume Air Flow Sensor \"A\" Circuit. ● P203F - 00 Reductant Level Too Low. ● P0423 - 00 Heated Catalyst Efficiency Below Threshold Bank 1. ● P20EE - 00 SCR NOX Catalyst Efficiency Below Threshold - Bank 1 Catalyst 1. ● P226C - 00 Turbocharger Boost Control \"A\" Slow Response. ● P2281 - 00 Air Leak Between MAF And Throttle Body. ● P229F - 00 NOX Sensor Circuit Range/Performance - Bank 1. ● P24DA - 00 Particulate Matter Sensor Exhaust Sample Error Bank 1. ● P214D - 00 SCR NOX Catalyst Outlet Temperature Too High During Particulate Filter Regeneration. ● P242B - 00 Exhaust Gas Temperature Sensor Circuit High - Bank 1 Sensor 3.** Customers may comment on one or more of the following: ● **Poor cold start performance. ● DEF level gauge slow to update after refill. ● Inverter drops out when shifting from Park to Drive.** ● Check engine light illuminated. ● Cruise control drops out/cancels on its own. ● Engine stumble, runs rough, or a slight lack of power. The following software enhancements are also available: ● **Improved troubleshooting and repair accuracy for air handling components through APT test available in WiTECH.** ● Reduce the occurrence of false faults Diagnostic Trouble Codes (DTCs) P0300 and P0315. ● DTC P1451 re-tune to reduce false faults. ● Improvements to allow DTC P2509 faults to be cleared with wiTECH. ● Adaptive Cruise Control (ACC) software fix to prevent cruise control dropouts. ● Engine stumble fix for improved drivability. ● Engine stall detection allowing DTC P032F to clear after a power cycle. ● Allow multiple PROXI rewrites. ● Enable cold re-prime (DTC P208B improvement). This bulletin involves inspecting and possibly reprogramming the Engine Control Module (ECM/PCM) with the latest available software","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11024048-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11024048-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11024048"}],"url":"https://open.wenmarpro.com/makes/ram/2500/2025/bulletins?code=P0266"},"related":{"components":[],"bulletins":[],"recalls":{"may_apply":true,"recalls":[],"lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null}}},"url":"https://open.wenmarpro.com/makes/ram/2500/2025/codes/P0266","note":"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.","attribution":["Contains information licensed under the Open Government Licence – Canada."]}