2024 Jeep Wrangler PCM Update for MIL and DTCs
This Technical Service Bulletin (TSB) 18-050-24 REV. B addresses Malfunction Indicator Lamp (MIL) illumination and various Diagnostic Trouble Codes (DTCs) in 2024 Jeep Wrangler models by updating the Powertrain Control Module (PCM) software.
This article details Technical Service Bulletin (TSB) 18-050-24 REV. B, issued on September 5, 2024, which addresses various performance issues in the 2024 Jeep Wrangler. This bulletin focuses on a 2024 Jeep Wrangler PCM update to resolve problems indicated by a Malfunction Indicator Lamp (MIL) illumination and specific Diagnostic Trouble Codes (DTCs).
This TSB supersedes TSB 18-050-24 REV. A, dated August 1, 2024, and has also been released as Rapid Service Update (RSU) 24-109. It applies to 2024 Jeep Wrangler vehicles built on or before August 16, 2024 (MDH 0816XX) and equipped with the 3.6L V6 VVT Engine Upgrade 1 (Sales Code ERC).
Symptoms
Owners of affected 2024 Jeep Wrangler vehicles may experience a Malfunction Indicator Lamp (MIL) illumination accompanied by one or more of the following Diagnostic Trouble Codes (DTCs):
- 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
In addition to these codes, customers might report other symptoms such as the vehicle running rough. Some owners may also see a "Service Transmission" message displayed in the Instrument Panel Cluster (IPC) due to clutch slip detection when the transfer case is in neutral. During flat towing, a transfer case mis-shift might occur while the engine is running and the clutch pedal is up with the transmission in gear.
Other software enhancements included in this update address vehicle no-starts after PCM replacement, O2 heater crack improvements, and general OBD software changes.
Cause
The root cause of these issues is identified as the Powertrain Control Module (PCM) software. An update to this software is necessary to correct the conditions leading to the MIL illumination and various DTCs.
Important Warnings and Claims Information
When performing the PCM reprogramming, specific precautions must be taken. Technicians are instructed to install a battery charger to maintain voltage between 13.2 and 13.5 volts throughout the flash process. It is crucial not to allow the battery voltage to drop below 13.2 volts or climb above 13.5 volts during the flash process, as this can disrupt the update. If the flash process is interrupted or aborted for any reason, it must be restarted from the beginning.
For warranty claims, dealers must use failure code CC (Customer Concern) with this Technical Service Bulletin. The
Frequently Asked Questions
- What does TSB 18-050-24 REV. B address for the 2024 Jeep Wrangler?
- TSB 18-050-24 REV. B addresses issues in the 2024 Jeep Wrangler that cause the Malfunction Indicator Lamp (MIL) to illuminate and trigger various Diagnostic Trouble Codes (DTCs), such as P0032 or P2504. It also resolves other symptoms like the vehicle running rough or a "Service Transmission" message.
- Which 2024 Jeep Wrangler models are affected by this PCM update?
- This update applies to 2024 Jeep Wrangler vehicles built on or before August 16, 2024 (MDH 0816XX) that are equipped with the 3.6L V6 VVT Engine Upgrade 1 (Sales Code ERC).
- What is the repair for the issues described in this TSB?
- The repair involves reprogramming the Powertrain Control Module (PCM) with the latest available software. This update aims to correct the underlying software issues causing the symptoms.
- Will I be charged for this PCM software update?
- All repairs performed under this Technical Service Bulletin are reimbursable within the provisions of your vehicle's warranty. You should contact your dealership for specific warranty coverage details.
What Jeep Wrangler owners report
Counted from the records in our database across 41 model years.
- 18,838
- Owner complaints
- 104
- Recalls
- 2,758
- Service bulletins
- 572
- Crashes reported
- 552
- Fires reported
- 435
- Injuries reported
The 2024 model year
970 complaints, the 4th most of 41 model years on file. Owners reported 14 crashes, 13 fires and 7 injuries for this year, which also has 14 recalls on file.
Power Train, the system this article covers, accounts for 2,470 of 18,838 complaints (13%), including 200 for 2024.
Complaints by model year
| 2006 | 730 | |
|---|---|---|
| 2007 | 1,750 | |
| 2008 | 1,904 | |
| 2010 | 686 | |
| 2012 | 836 | |
| 2014 | 658 | |
| 2018 | 1,827 | |
| 2019 | 747 | |
| 2021 | 963 | |
| 2024 | 970 |
Most-reported systems
- Steering — 3,929
- Electrical System — 3,613
- Power Train — 2,470
- Engine — 2,406
- Fuel System — 2,015
Latest recalls for the 2024 model year
- 26V363000 — Steering (Jun 2026) — Park outside
- 26V327000 — Back Over Prevention (May 2026)
- 25V766000 — Engine (Nov 2025)
Recent owner reports about power train
While driving my vehicle, I have noticed a significant decrease in power and a corresponding slowdown, particularly in traffic conditions. This has resulted in a near-miss collision with another vehicle in the rear.
Read owner complaints →My 2024 Wrangler 4xe has 27,000 miles on it. On Friday, 7/10/2026 around 7:00 in the morning the check engine light came on. I immediately called the dealer to set up an appointment and they could not get me in until 7/15/2026.
Complaints are owner reports filed with NHTSA. They are unverified, and counts depend on how many vehicles were sold, so they are not a failure rate.
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