U11E9: How to Diagnose & Fix — Lost Communication With Active Grille Shutter Module
3 vehicles · 2 makes · $200-$12,000 repair
How to diagnose and fix U11E9: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Jeep Grand Wagoneer · 2022–2024
Owner reports and NHTSA complaints describe repeated dead 12V batteries and no-start conditions on Grand Wagoneer, often after sitting overnight or a few days. The pattern is consistent with parasitic draw from modules not going to sleep (commonly telematics/infotainment-related controllers), leading to low voltage and cascading network faults.
Common Symptoms
- No-crank/no-start after sitting
- Multiple warning lights after jump start
- Remote start inoperative
- Battery voltage low message
- Repeated need for jump starts or battery replacement
How to Fix
Perform a parasitic draw test with an ammeter and use a scan tool to identify modules staying awake; update software per applicable Stellantis service bulletins and replace the failing module if it will not sleep. Replace the 12V battery if it has been deeply discharged multiple times and verify charging system output.
What you need to diagnose it
The fix here starts with a test, not a part — which repair you need depends on what the test finds.This issue involves U codes, which a basic engine-code reader cannot see.At least one code uses a manufacturer-specific format. No scanner recommendation is shown because family-level coverage cannot prove it can read that code.
UNI-T UT210E Low-Current DC Clamp Meter
1 mA resolution on the 2 A range — a 0.1 A meter reads a 50 mA drain as zero
$40–$70View
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Testing and isolating the fault is DIY work. Replacing or reprogramming a control module is not — most are VIN-programmed, so a new one does nothing until a shop codes it to your car. Check for an open recall or service bulletin before buying anything.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Duralast Platinum H7-AGM Group 94R main batteryOEMDuralast H7-AGM / SKU 319458
Confirm installed group, CCA, vent, terminal layout and VIN bec
- Duralast Platinum H8-AGM Group 49 main batteryOEMDuralast H8-AGM / SKU 319459
Do not substitute it for an installed H7 without confirming tray/
- Duralast Platinum AUX14 Group 400 AGM auxiliary batteryOEMDuralast AUX14 / SKU 755654
It is not the main battery; verify VIN/equipment and the installed auxiliary battery label
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Jeep Grand Cherokee · 2022–2025
Grand Cherokee 4xe models have generated substantial owner complaints for hybrid system warnings, charging faults, propulsion loss, and no-start conditions tied to the high-voltage battery pack, battery coolant heater, or related control logic. Several recalls and service actions have addressed fire risk, battery pack concerns, and software behavior in 4xe vehicles. Owners commonly describe a check engine light with 'service charging system' or 'service hybrid electric vehicle system' messages, sometimes leaving the vehicle unable to charge or drive normally.
Common Symptoms
- service hybrid electric vehicle system message
- service charging system message
- vehicle will not charge
- reduced power or limp mode
- check engine light on
- no-start condition
How to Fix
Diagnose with a scan tool capable of reading hybrid control modules, then inspect for active recalls, battery pack faults, coolant heater issues, and software updates. Repairs range from module reprogramming and battery coolant heater replacement to high-voltage battery pack replacement depending on the fault path. Because of the high-voltage system and fire-related campaigns, dealer-level diagnosis is strongly recommended.
Owner tips & cautions
- TipBefore troubleshooting, check VIN-specific open recalls and software campaigns; many 4xe complaints are tied to updates or battery-related safety actions.
- TipOwners recommend documenting charge level, ambient temperature, and whether Level 1 or Level 2 charging was used when faults occur, since intermittent charging issues can be pattern-dependent.
Sources for this issue (1)
Chrysler Voyager · 2020–2022
The active grille shutter (AGS) is a motorized vane assembly behind the lower grille that the PCM closes for warm-up and aerodynamics and opens for cooling airflow. On these minivans the integrated AGS actuator/module fails or drops off the vehicle network, setting U11E9 (PCM lost communication with the active grille shutter module) and illuminating the MIL. Chrysler issued dealer bulletin 9004138 (June 30, 2021) and revision 9004138A (July 21, 2021) covering AGS diagnosis and replacement with preliminary checks, and both are listed against the 2020 and 2021 Chrysler Voyager; a further bulletin, S2008000132 and its revisions, covers MIL illumination with AGS communication loss combined with ambient air temperature sensor codes. The vanes can also bind mechanically from road debris, ice, or a minor front-end impact. A shutter stuck closed restricts radiator airflow — most noticeable as weak A/C performance in traffic and rising coolant temperature when towing or idling in heat — while a shutter stuck open costs warm-up time and fuel economy. Diagnosis is muddied by the fact that the module, the wiring and the mechanical vanes all produce the same code, which is why the bulletin guidance exists to stop parts being replaced before the preliminary checks are done.
Common Symptoms
- Check engine light on with no drivability complaint
- A/C blows warm in stop-and-go traffic or at idle in hot weather
- Coolant temperature climbing when towing or idling
- Audible clicking or grinding from behind the lower grille on startup
- Reduced fuel economy and long warm-up time
How to Fix
Inspect vanes for debris/impact, test the connector and pigtail, and confirm current PCM software. Replace the complete shutter/motor assembly only after an internal AGS failure is established.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mopar 68438679AD active grille shutter assembly$231
Includes the integrated actuator; verify VIN and front-fascia configuration.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (3)
Find U11E9 by make
Browse every documented model and issue for your make.
U11E9 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does U11E9 mean?
U11E9 stands for "Lost Communication With Active Grille Shutter Module." U11E9 is a manufacturer-specific network communication code used mainly by Chrysler, Dodge, Jeep, and RAM vehicles. It means a control module (typically the PCM) has lost communication over the data bus with the active grille shutter system, which opens and closes vanes behind the grille to manage airflow for aerodynamics, fuel economy, and engine warm-up. The computer detected that expected messages from the shutter actuator are missing or corrupted. It usually only triggers a check engine light and a small efficiency/cooling impact rather than a driveability emergency.
What are the most common causes of U11E9?
The most common causes of U11E9 are: Faulty active grille shutter actuator/motor, Damaged or corroded wiring or connector at the shutter module, Open or short in the data bus (CAN) circuit, Loss of power or ground to the shutter module, Debris, ice, or physical obstruction jamming the shutter, Software/PCM update needed. The specific cause varies by vehicle.
How much does it cost to fix U11E9?
Repair costs for U11E9 range from $200 to $12,000, depending on the vehicle and root cause.
Which vehicles are affected by U11E9?
Au7o has documented U11E9 across 3 vehicle models from 2 manufacturers: Chrysler, Jeep.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.