P26AB on the 2015 Ram 1500
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.
Nobody has written a description of this code yet.
| 1803715 | 2022-09-26. Service bulletin. 5.7L P26AB Engine coolant bypass valve stuck. |
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| 18-037-15 | 2021-05-03. Service bulletin. 5.7L P26AB Engine coolant bypass valve stuck. |
| 18-019-15 REV C | 2019-05-20. Service bulletin. Flash: 3.0L 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 bucking under hard acceleration. In addition other customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation a technician may find one of more of the following Diagnostic Trouble Codes (DTCs) set in the PCM memory: ? P1296-00 - EGR Slow Response - Increasing Flow. ? P249C-00 - Excessive Time To Enter Closed Loop Reductant Injection Timing Control. ? P20C2-00 - Reductant Heater 3 Control Circuit Performance. ? P24A4-00 - Particulate Filter Restriction - Soot Accumulation Too High. ? P24D1-00 - Particulate Matter Sensor Regeneration Incomplete. ? P1288-00 - NOX Sensor 1/2 Zero Offset Too High. ? P1289-00 - NOx Sensor 1/2 Zero Offset Too Low. ? P2463-00 - Diesel Particulate Filter - Soot Accumlation . ? U0422-00 - Implausible Data Received From Body Control Module. ? U3017-00 - Control Module Timer/Clock Performance. ? P2196-00 ? O2 Sensor 1/1 Stuck Rich. ? P1E0C-00 ? Empty Fuel Tank. ? P2237-00 ? O2 Sensor 1/1 Pump Cell Current Circuit Open. ? P1297-00 ? EGR Slow Response - Decreasing Flow. ? P0420-00 ? Catalyst Efficiency (Bank 1). ? P24AF-00 ? Particulate Matter Sensor Circuit Performance. ? P26AB ? Engine Coolant Bypass Valve Stuck. ? P204F-00 ? Reductant System Performance. ? P20E9-00 ? Reductant Pressure Too High. ? P2002-00 ? Diesel Particulate Filter Efficiency Below Threshold. ? P2299-00 ? Brake Pedal Position/Accelerator Pedal Position Incompatible. ? P208B-00 ? Reductant Pump 1 Control Performance. ? P016A-00 ? Excessive Time To Enter Closed Loop Air/Fuel Ratio Control. Upon further investigation a technician may find the following Diagnostic Trouble Code (DTC) set in the TCM memory: ? U1424-00 - Implausible Engine Torque Signal Received |
| 18-019-15 REV-B | 2018-11-26. Service bulletin. Flash: 3.0L 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. Upon further investigation a technician may find one of more of the following Diagnostic Trouble Codes (DTCs) set in the PCM memory. ? P2196-00 ? O2 Sensor 1/1 Stuck Rich. ? P1E0C-00 ? Empty Fuel Tank. ? P2237-00 ? O2 Sensor 1/1 Pump Cell Current Circuit Open. ? P1297-00 ? EGR Slow Response - Decreasing Flow. ? P0420-00 ? Catalyst Efficiency (Bank 1). ? P24AF-00 ? Particulate Matter Sensor Circuit Performance. ? P26AB ? Engine Coolant Bypass Valve Stuck. ? P204F-00 ? Reductant System Performance. ? P20E9-00 ? Reductant Pressure Too High. ? P249C-00 ? Excessive Time To Enter Closed Loop Reductant Injection Control. ? P2002-00 ? Diesel Particulate Filter Efficiency Below Threshold. ? P20C2-00 ? Reductant Heater 3 Control Circuit Performance. ? P2299-00 ? Brake Pedal Position/Accelerator Pedal Position Incompatible. ? P208B-00 ? Reductant Pump 1 Control Performance. ? P1288-00 ? Nox Sensor 1/2 Zero Offset Too High. ? P016A-00 ? Excessive Time To Enter Closed Loop Air/Fuel Ratio Control. In addition to addressing the above DTCs, the following powertrain system improvements/enhancements are also included in this software release. ? Enhancements to improve A/C compressor relay duty cycle operation to prevent ignition off battery draw. ? Powertrain system improvements to enable EGR cleaning routine. |
| 18-103-16 REV. B | 2017-11-03. Service bulletin. Flash: Powertrain System Improvements/EnhancementsThis bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following (DTCs) have been set:P2299 - Brake Pedal Position / Accelerator Pedal Position Incompatible (14&15 MY). P0116 - Engine Coolant Temperature Sensor Performance (14&15 MY). P0335 - Crankshaft Position Sensor Circuit (14&15 MY). U1424-00 - Implausible Engine Torque Signal Received (14&15 MY). P1239 - Engine Oil Temperature Too Low (15 MY Sales Code ERB). P0300 - Multiple Cylinder Misfire.P0456 - EVAP System Small Leak.P0607 - ECU Internal Performance.P2096 - Downstream Fuel Trim System 1 Lean.P2097 - Downstream Fuel Trim System 1 Rich. P2098 - Downstream Fuel Trim System 2 Lean. P2099 - Downstream Fuel Trim System 2 Rich. P1004 - Short Runner Valve Control Performance. P2008 - Short Runner Valve (SRV) Control Circuit. P2016 - Intake Manifold Runner Position Sensor Circuit Low. P2017 - Intake Manifold Runner Position Sensor Circuit High. P26AB - Engine Coolant Bypass Valve Stuck.U0140 - Lost Communication With Body Control Module (attempting to clear this DTC will be unsuccessful) (with 4.7L or 3.6L).P0607 - ECU Internal Performance. (with 4.7L).The following improvements are included in this update:Throttle Position Sensor (TPS) calibration (14&15 MY).Corrects a false oil pressure lamp illumination at key on (14&15 MY with 5.7L).Shift quality of the first shift after a few hours of vehicle drivetrain cooling down.Automatic Shut Down (ASD) Relay Enhancements To Improve Fuel Pump Relay Initialization At Key On - (Auto Shutdown).Charging system voltage regulator control improvements.System improvements to prevent MIL illumination with a DTC P0300 - Multiple Cylinder Misfire when using a block heater in ambient temperatures grea |
5 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.