# 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.

## Bulletins for this model year that name P26AB

- [10220454](https://open.wenmarpro.com/bulletins/10220454), 2022-09-26: 5.7L P26AB Engine coolant bypass valve stuck.
- [10191425](https://open.wenmarpro.com/bulletins/10191425), 2021-05-03: 5.7L P26AB Engine coolant bypass valve stuck.
- [10160014](https://open.wenmarpro.com/bulletins/10160014), 2019-05-20: 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
- [10148989](https://open.wenmarpro.com/bulletins/10148989), 2018-11-26: 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.
- [10121873](https://open.wenmarpro.com/bulletins/10121873), 2017-11-03: 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