P0685 on Jeep
ECM/PCM Power Relay Control Circuit/Open
P0685 on Jeep vehicles indicates ecm/pcm power relay control circuit/open. Au7o has documented this code across 1 Jeep model — most commonly on Wrangler. An open or general fault in the control circuit for the ECM/PCM main power relay. The module cannot properly control the relay that supplies its own switched power. Typical repair costs on Jeep range from $100 to $1,200, depending on the specific model and root cause.
Common Causes of P0685
- •Faulty ECM/PCM power relay
- •Open in the relay control circuit
- •Corroded/damaged connectors
- •Blown fuse
- •Internal PCM driver fault
P0685 on Jeep by Model
Jeep Wrangler(1 issue)
- TIPM (Totally Integrated Power Module) failure — fuel pump relay & random electrical faults2012-2018
The TIPM is the integrated fuse/relay power-distribution module controlling most electrical systems. On many 2007-2018 Chrysler/Jeep vehicles, including the JK Wrangler, the internal fuel-pump relay (and later the other relays) degrades. The first symptom is usually a fuel-pump-relay problem causing hard starts, no-start, or stalling; failures can also present as random gremlins — fuel pump running with the key off, wipers or door locks cycling on their own, or intermittent electrical loads. While Chrysler recalled the 2011-2013 Grand Cherokee/Durango with an external relay, the Wrangler was generally not recalled, leaving owners to repair the module themselves. Dealer TIPM replacement runs ~$1,000-$1,200; repair/rebuild services and external-relay bypass kits are cheaper alternatives.
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What does P0685 mean on Jeep?▼
P0685 stands for "ECM/PCM Power Relay Control Circuit/Open." An open or general fault in the control circuit for the ECM/PCM main power relay. The module cannot properly control the relay that supplies its own switched power. On Jeep specifically, this code is documented across 1 model.
What causes P0685 on Jeep vehicles?▼
Common causes on Jeep: Faulty ECM/PCM power relay, Open in the relay control circuit, Corroded/damaged connectors, Blown fuse, Internal PCM driver fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0685 on a Jeep?▼
Repair costs on Jeep range from $100 to $1,200, depending on the specific model and root cause.
Which Jeep models have P0685 documented?▼
Au7o has documented P0685 on 1 Jeep model: Wrangler.