U1191 on 2021 Jeep Grand Cherokee: Lost Communication with Switch Bank Module 2 Fixes

What's Unique About the 2021-2021 Jeep GRAND CHEROKEE

For the 2021 Jeep Grand Cherokee, specifically the all-new 'WL' generation, this code is strongly associated with a known software issue. Manufacturer TSB 08-050-22 REV. B explicitly states that U1191, often appearing with a host of other 'Lost Communication' codes, can be resolved by reprogramming the Body Control Module (BCM). This indicates the problem is more likely a centralized software fault rather than a widespread failure of individual switches or wiring harnesses, which is a common scenario for communication codes on other vehicles. The WL platform's heavy reliance on interconnected modules makes it susceptible to these types of network-wide faults from a single software bug.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle. 👇

Generation note: The 2021 model year included both the outgoing 'WK2' generation and the all-new 'WL' generation (Grand Cherokee L). The primary TSB addressing code U1191 specifically applies to the 2021 (WL) model. While the code may appear on a WK2, the most documented cause and fix relate to the WL platform. The same software-related issue and TSB fix also apply to 2022 WL models.

Symptoms You May Notice

• Buttons on a center console switch panel are not working (e.g., climate control, terrain/4WD select, lane sense, auto start/stop).
🎬 Watch: Troubleshooting start-stop and module communication issues
• Check engine light or other service message may be displayed, though often this code sets without a warning light.
• Multiple other communication codes appearing at the same time.
• In some cases, owners report related electrical issues like the auto liftgate failing or speakers cutting out.
• Heated and ventilated seat controls on the Uconnect touchscreen may be grayed out and unusable.

Most Likely Causes

1. Body Control Module (BCM) Software Glitch 🔴 High Probability → Shop Body Control Module As documented in TSB 08-050-22 REV. B, the factory software in the BCM on early WL models is prone to communication errors with various sub-modules on the LIN bus network. This TSB was also released as a Rapid Service Update (RSU) 22-198, indicating a proactive campaign by the manufacturer.
   How to confirm: A Jeep dealership can check the vehicle's VIN against the TSB and RSU campaigns. Using a wiTECH scan tool, they can verify the current BCM software version and see if the U1191 code is present along with other related LIN bus communication codes listed in the bulletin.
   Typical fix: Reprogramming (flashing) the BCM with the latest available software. This is a dealer-only procedure that takes approximately 0.3-0.5 labor hours and is covered under warranty. The technician must use a battery charger to maintain stable voltage during the flash.
   Est. part cost: $0 (if covered by warranty or RSU)
2. Faulty Switch Bank Module 2 ⚪ Low Probability → Shop Body Control Module While less common than the software issue, the module itself can fail internally, preventing it from communicating. Physical hardware failure is a possibility on any electronic component.
   How to confirm: This should only be suspected after the BCM software is confirmed to be up-to-date. A technician would test the power, ground, and LIN bus communication lines at the switch module connector. If all inputs are good (power, ground, and a toggling voltage signal on the LIN wire), the module itself is condemned.
   Typical fix: Replacement of the specific switch bank assembly. This part is located in the center console stack.
   Est. part cost: $150-$300
3. Wiring or Connector Issue ⚪ Low Probability Modern vehicle harnesses are complex. A loose pin in a connector, a wire chafed during assembly, or corrosion from moisture can interrupt the LIN bus signal between the BCM and the switch bank.
   How to confirm: Visual inspection of the harness and connectors behind the switch panel and at the BCM. A multimeter would be used to check for continuity and proper voltage on the LIN bus wire. The voltage should toggle between approximately 1V and battery voltage.
   Typical fix: Repairing the damaged wire or re-seating/cleaning the loose connector.
   Est. part cost: $5-$50

Diagnosis Steps

1. Verify the vehicle is a 2021 (WL) Grand Cherokee.
2. Check with a Jeep dealer if TSB 08-050-22 REV. B or Rapid Service Update (RSU) 22-198 is open for the vehicle's VIN.
3. If the TSB/RSU is applicable, have the dealer perform the BCM software update as the primary repair step. This involves connecting a wiTECH tool and a battery charger.
4. After the flash, the technician should clear all DTCs, let the vehicle's modules go to sleep, and then re-check for any returning codes.
5. If the code returns after the flash, or if the TSB does not apply, proceed with standard diagnostics.
6. Using a scan tool, check for communication with 'Switch Bank Module 2'. The wiTECH 'View Topology' feature can show if the module is offline.
7. Gain access to the switch bank module in the center console/dash.
8. Inspect the module's electrical connector for damage, corrosion, or loose pins.
9. Using a multimeter and wiring diagram, verify the module is receiving proper battery voltage and has a solid ground connection.
10. Check the integrity of the LIN bus communication wire between the switch module and the BCM. Voltage should toggle between ~1V and battery voltage.

Parts You'll Likely Need

• Body Control Module (BCM) Reprogramming — This is not a physical part, but a software update that is the most common and manufacturer-recommended fix for this specific code on this vehicle.
  Trusted brands: Mopar (Dealer Service)
  OEM price range: $0-$200
  Aftermarket price range: N/A
• Center Stack Switch Bank (OEM #Varies by trim (e.g., 68524992AA, 68524993AB)) — If the BCM flash does not resolve the issue and the wiring is confirmed to be good, the switch module itself is the next most likely point of failure.
  Trusted brands: Mopar
  OEM price range: $150-$300
  Aftermarket price range: $100-$200

Related Codes That Often Appear With This One

• U121E-00 — Lost Communication With Steering Wheel Cruise Control Switch. Both are LIN bus modules reporting to the BCM and are part of the same software glitch addressed in TSB 08-050-22 REV. B.
• U1207-00 — Lost Communication With Terrain Switch Bank Module. Also part of the same communication network and addressed by the same BCM flash.
• U1153-00 — Lost Communication With Windshield Wiper Smart Module. Another module on the same network affected by the BCM software issue.
• U114F-00 — Lost Communication with LIN Overhead Console. Also part of the same communication network and addressed by the same BCM flash.
• U113B-00 — Lost Communication With Switch Bank Module. A general code for another switch bank, also covered by the same TSB.
• U1125-00 — Lost Communication With LIN ECU 5- (Ride Height Switch Module). For vehicles with air suspension, this is another module on the same network affected by the BCM software issue.

Technical Service Bulletins (TSBs) & Recalls

• 08-050-22 REV. B: Flash: Body Control Module (BCM) Updates. Addresses U1191 and other 'Lost Communication' codes by reprogramming the BCM on 2021 (WL) Grand Cherokee models.
• RSU 22-198: This is the Rapid Service Update version of TSB 08-050-22 REV. B, used by dealers to proactively flash vehicles.

Platform-Specific Known Issues

• TSB 08-050-22 REV. B was released to address a condition where various interior switches and lamps may become inoperative due to a software issue in the Body Control Module, specifically causing codes like U1191.
• The 2021 WL platform launch was noted for numerous electrical gremlins and software-related complaints, including issues with the Uconnect system, random warning lights, and battery drain, making software updates a common fix for many initial problems.

Mechanic-Grade Diagnostic Values

• LIN Bus Voltage — expected: When operating correctly, the voltage on the single LIN wire should toggle rapidly. Using a multimeter on min/max setting, it should show a max voltage near battery voltage (~12V) and a minimum voltage of approximately 1V. A steady, non-toggling voltage indicates a fault.. Failure: A constant voltage of 0V suggests a short to ground or an open circuit. A constant voltage of 12V suggests a short to power.
• Battery Voltage During Flash — expected: Must be maintained between 13.2 and 13.5 volts.. Failure: Voltage dropping below 13.2V or climbing above 13.5V can cause the BCM flash procedure to fail or corrupt the module.

Hidden / Shadow Codes Worth Checking

• U1191-00: The '-00' suffix indicates 'No Sub Type Information'. However, a dealer-level scan tool like wiTECH will provide crucial context by displaying the code's status as 'Active', 'Stored', or 'Intermittent'. An intermittent status after a repair might suggest a wiring issue, while an active code points to a hard failure. (see via wiTECH 2.0 or equivalent advanced diagnostic scan tool.)

Scan Tool Commands That Help

• wiTECH 2.0: View Topology — This function provides a visual map of the vehicle's communication networks. It should be used as an initial step to see if 'Switch Bank Module 2' is greyed out or marked with a red 'X', which instantly confirms it is offline and not communicating with the BCM.
• wiTECH 2.0: BCM Flash/Reprogram — This is the primary repair procedure specified by TSB 08-050-22 REV. B to fix the software bug causing the U1191 code.
• wiTECH 2.0: Restore Vehicle Configuration / Proxi Configuration Alignment — This procedure must be performed if the BCM or another major module is replaced. It synchronizes the configuration data across all modules on the network. Failure to perform a Proxi alignment after a module replacement can cause numerous communication codes and feature malfunctions.

Wiring & Ground Locations

• G108 — On the passenger side inner fender, near the power distribution block.. This is a major ground point that services multiple components, including the Body Control Module (BCM) on some Jeep platforms. A poor connection at this ground can cause intermittent and difficult-to-diagnose communication issues for any module it serves, including the BCM which is the master for Switch Bank Module 2.
• BCM Location — In the driver's footwell, at the base of the left A-pillar.. Knowing the physical location of the Body Control Module is necessary for advanced hardware diagnostics, such as checking the LIN bus wire for continuity between the BCM connector and the switch bank connector.

Real Owner Repair Stories

• WLJeeps.com Forum User (2022 Jeep Grand Cherokee L) — The lower switch bank containing buttons for auto start/stop, lane keep assist, and traction control stopped working intermittently.
  ❌ Tried (didn't work) Owner initially tolerated the intermittent nature of the problem without attempting a repair.
  ✅ What actually fixed it The dealer performed a software update (flash) on the Body Control Module (BCM) as per the relevant TSB. This completely and permanently resolved the issue with the non-functional buttons.

OEM Part Supersession History

• 68524992AA → 68524992AB, 68524992AC, and potentially later revisions. — Part revisions are common to address minor hardware improvements, durability concerns, or manufacturing process changes.
  Heads up: When replacing the switch bank, it is critical to use the latest part number specified by the dealer's parts catalog for the vehicle's VIN to ensure compatibility.