# Service bulletin 18\-026\-25

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11018699
- Published by NHTSA: 2025\-05\-30
- Manufacturer's number: 18\-026\-25
- Manufacturer's date: 2025\-05\-24
- NHTSA component: POWER TRAIN
- Manufacturer's system: Powertrain Control Module

## NHTSA's 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 \(DTCs\): ● \*\*P2450 \- Fuel Tank Isolation Valve Stuck Open.\*\* ● P0032 \- O2 Sensor 1/1 Heater Circuit High. ● P2097 \- Downstream Fuel Trim System 1 Rich. ● P0171 \- Fuel System 1/1 Lean. ● P0300 \- Multiple Cylinder Misfire. ● P06E4 \- Control Module Wake\-Up Circuit Performance. ● B12B4 \- Charge Status Indicator Module Internal. ● P061B \- Internal Control Module Torque Calculation Performance. ● P0810 \- Clutch Position Control Error. ● P2885 \- Engine Disconnect Clutch Engagement Fault. Customers may also experience one or more of the following: ● \*\*""Service Hybrid System"" message displays on the Instrument Panel Cluster \(IPC\). ● Wrench icon displays on the IPC.\*\* ● Vehicle misfires. ● Low speed engine stall at idle. ● Difficulty shifting out of 4LO. ● Idle creep while in 4LO with transmission in neutral. \*\*This bulletin involves reprogramming the Powertrain Control \(PCM\) and the Auxiliary Hybrid Control Processor \(AHCP\) also known as Power Inverter Module \(PIM\) and possibly the Transmission Control Module \(TCM\) with the latest available software.\*\*"

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11018699-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11018699-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Trouble codes named

B12B4, P0032, P0171, P0300, P061B, P06E4, P0810, P2097, P2450, P2885

## Vehicles listed

- 2024 JEEP WRANGLER

## Other bulletins for the same vehicles and component

- [S2621000004](/bulletins/11038329.md), 2026-10-07, Service bulletin: POWER TRAIN. The Customer May Complain About a Popping Noise, Grinding Noise, or an Intermittent No Reverse or Forward Transmission Engagement. The Tech May Find Damaged and/or Worn Transmission Output Shaft Splines \(850RE Transmission Only\)
- [114741](/bulletins/11037596.md), 2026-09-30, Service bulletin: POWER TRAIN. TRANSMISSION KIT \- WITH TORQUE CONVERTER
- [21\-041\-26 REV. A](/bulletins/11034324.md), 2026-07-02, Service bulletin: POWER TRAIN. Transmission Auxiliary Oil Pump Failure Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set \*\*one or more the following Diagnostic Troubles Code \(DTCs\): ● U0287\-00 \- Lost Communication With Transmission Fluid Pump Module 1.\*\* ● P0B0D\-00 \- Electric/Auxiliary Transmission Fluid Pump Motor Control Module. Customers may also comment on the following: ● Vehicle is in limp mode. This bulletin involves replacing the transmission oil pump.
- [21\-041\-26](/bulletins/11032847.md), 2026-05-20, Service bulletin: POWER TRAIN. Transmission Auxiliary Oil Pump Failure Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must exhibit/set the following Diagnostic Trouble Code \(DTC\): ● P0B0D\-00 \- Electric/Auxiliary Transmission Fluid Pump Motor Control Module. Customers may also comment on the following: ● Vehicle is in limp mode This bulletin involves replacing the transmission oil pump.
- [18\-003\-26 REV A](/bulletins/11031448.md), 2026-04-22, Service bulletin: ENGINE; POWER TRAIN. 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 \(DTCs\): ● \*\*P0300 \- Multiple Cylinder Misfire \(Active or Stored status set during cold start catalyst heating\). ● P0301 \- Cylinder 1 Misfire \(Active or Stored status set during cold start catalyst heating\). ● P0302 \- Cylinder 2 Misfire \(Active or Stored status set during cold start catalyst heating\). ● P0303 \- Cylinder 3 Misfire \(Active or Stored status set during cold start catalyst heating\). ● P0304 \- Cylinder 4 Misfire \(Active or Stored status set during cold start catalyst heating\). ● P0305\-00 \- Cylinder 5 Misfire \(Active or Stored status set during cold start catalyst heating\). ● P0306\-00 \- Cylinder 6 Misfire \(Active or Stored status set during cold start catalyst heating\).\*\* ● P0032 \- O2 \- Sensor 1/1 Heater Circuit High. ● P0038 \- O2 \- Sensor 1/2 Heater Circuit High. ● P0052 \- O2 \- Sensor 2/1 Heater Circuit High. ● P0058 \- O2 \- Sensor 2/2 Heater Circuit High. ● P1129 \- Closed Loop Fueling Not Achieved\-Banks 2 Upstream. ● P0152 \- O2 Sensor 2/1 Circuit High. ● P0158 \- O2 Sensor 2/2 Circuit High. ● P2504 \- Charging System Output High. ● P0563 \- System Voltage High. ● P08A6 \- Gear Lever Position Sensor System \- Multiple Sensor Correlation. \(Manual Transmission Only\) ● P152F \- Engine Hood Switch 2 / Engine Hood Switch 1 Correlation. ● P1129 \- Closed Loop Fueling Not Achieved \- Bank 2 Upstream. ● P0152\-02 \- O2 Sensor 2/1 Circuit High. ● P0158\-02 \- O2 Sensor 2/2 Circuit High. ● P2504 \- Charging System Output High. ● P0563 \- Battery/System Voltage High. Customers may also comment on one or more of the following: ● \*\*The vehicle has a rough idle. ● The engine has a miss or runs rough. ● Noisy valvetrain. M18 FSAR\-TSB\-7163 \-2\- ● "Service Transmission" message in the Instrument Panel Cluster \(IPC\) due to clutch slip detection with the transfer case in neutra
- [S2621000003 REV.A](/bulletins/11030138.md), 2026-03-18, Service bulletin: POWER TRAIN. 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.
- [S2603000001](/bulletins/11029774.md), 2026-03-05, Service bulletin: POWER TRAIN. A suspected leak may be noticed on the front or rear axle pinion seal.
- [S2621000003](/bulletins/11029770.md), 2026-03-05, Service bulletin: POWER TRAIN. Service transmission/check engine warning indicator for the 850RE, 8HP50, 8HP70, 8HP75, 8HP75\-PHEV transmissions that have fault codes P07E4, P1DB2, P0716, P1B14, P0733, P1D90, P1DB7, P1B13.
- [9100749 Rev 1](/bulletins/11027741.md), 2026-01-21, Service bulletin: POWER TRAIN. We have observed that some JL/JT rear axle shafts are leaking oil. Replace axle shaft and seal together. Do not replace seal only. Keep original seal and axle shaft and send the parts as fast track.
- [9100749](/bulletins/11027644.md), 2026-01-14, Service bulletin: POWER TRAIN. axle seal We have observed that some JL/JT rear axle shafts are leaking oil. Replace axle shaft and seal together. Do not replace seal only. Keep original seal and axle shaft and send the parts as fast track.

JSON: [/v1/bulletins/11018699](/v1/bulletins/11018699)

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