P0691 on 2021-2023 Jeep Grand Wagoneer — Fan 1 Control Circuit Low
1 vehicles · 1 makes · $450-$1,600 repair
Most Reported On
P0691 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2021-2023 Jeep Grand Wagoneer, with repair costs ranging from $450 to $1,600.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0691, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
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.