P0691 on Jeep
Fan 1 Control Circuit Low
P0691 on Jeep vehicles indicates fan 1 control circuit low. Au7o has documented this code across 1 Jeep model — most commonly on Grand Wagoneer. 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. Typical repair costs on Jeep range from $450 to $1,600, depending on the specific model and root cause.
Common Causes of P0691
- •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
P0691 on Jeep by Model
Jeep Grand Wagoneer(1 issue)
- Cooling Fan Module Failure / Overheating Warning2021-2023
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.
Looking for P0691 on a different make?
View P0691 across all makes →Frequently Asked Questions
What does P0691 mean on Jeep?▼
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. On Jeep specifically, this code is documented across 1 model.
What causes P0691 on Jeep vehicles?▼
Common causes on Jeep: Faulty cooling fan relay, Failed cooling fan motor, Short to ground in the fan control wiring, Corroded or damaged fan connector, Blown fan fuse. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0691 on a Jeep?▼
Repair costs on Jeep range from $450 to $1,600, depending on the specific model and root cause.
Which Jeep models have P0691 documented?▼
Au7o has documented P0691 on 1 Jeep model: Grand Wagoneer.