P0691 on 2021-2023 Jeep Grand Wagoneer — Fan 1 Control Circuit Low
1 vehicles · 1 makes · $450-$1,600 repair
How to diagnose and fix P0691: most-reported vehicles
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Jeep Grand Wagoneer · 2021–2023
The electric cooling fan module on the Grand Wagoneer has been documented to fail, causing the dual electric radiator fans to run at reduced speed or stop entirely, resulting in engine coolant temperature spikes especially at low speeds and in traffic. The fan control module can develop internal MOSFET failures due to heat cycling, and Stellantis issued related service guidance through their dealer network. Owners report the temperature gauge rising into the red zone during stop-and-go driving and the A/C compressor cutting out as a secondary symptom.
Common Symptoms
- Engine temperature gauge rising above normal in traffic
- Cooling fans audibly not running or running slowly at idle
- A/C compressor cuts out unexpectedly in hot weather
- Overheating warning message on instrument cluster
- Check engine light with fan control related fault codes
How to Fix
Replace the integrated fan control module (FCM) mounted near the radiator assembly. Updated module part numbers have been released by Mopar to address thermal reliability. Inspect cooling fan wiring harness for chafing near the module connector, as wiring damage can mimic module failure. Coolant system inspection and flush recommended simultaneously.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mopar 68275634AD standard-duty radiator fan assemblyOEMMopar 68275634AD
Fan/module replacement after command and circuit tests confirm failure on the standard-duty 6.4L branch Fitment/availability: 2022-2023 Grand Wagoneer 6.4L without heavy-duty cooling. Confirm VIN/cooling sales code; not for heavy-duty co…
- Genuine Mopar 68268606AE heavy-duty radiator fan assemblyOEMMopar 68268606AE
Fan/module replacement after command and circuit tests confirm failure on the heavy-duty 6.4L branch Fitment/availability: 2022-2023 Grand Wagoneer 6.4L with heavy-duty cooling. Confirm VIN/cooling sales code; not for standard-duty cooli…
- Genuine Mopar 68468156AC 3.0L radiator fan assemblyOEMMopar 68468156AC
Fan/module replacement after command and circuit tests confirm failure on the 3.0L Hurricane branch Fitment/availability: 2022-2025 Grand Wagoneer 3.0L catalog branch. Confirm VIN/current supersession; not for either 6.4L cooling configu…
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P0691 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 P0691 mean?
P0691 stands for "Fan 1 Control Circuit Low." This code means the engine computer detected low voltage (or a short to ground) in the control circuit for cooling fan 1. The PCM commands the cooling fan via a relay or control circuit and monitors the signal voltage. A fault can prevent the fan from running properly, risking engine overheating in traffic or at low speeds.
What are the most common causes of P0691?
The most common causes of P0691 are: Faulty cooling fan relay, Failed cooling fan motor, Short to ground in the fan control wiring, Corroded or damaged fan connector, Blown fan fuse, PCM fan-control driver fault. The specific cause varies by vehicle.
How much does it cost to fix P0691?
Repair costs for P0691 range from $450 to $1,600, depending on the vehicle and root cause.
Which vehicles are affected by P0691?
Au7o has documented P0691 across 1 vehicle models from 1 manufacturers: Jeep.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.