P0685: How to Diagnose & Fix — ECM/PCM Power Relay Control Circuit/Open

The TIPM is the central under-hood fuse/relay and power-distribution computer that controls the fuel pump, lighting, wipers, door locks, horn, and trailer-tow circuits. It is a widespread failure point on 2007-2016 Ram trucks. The most common complaint is the internal fuel pump relay sticking: stuck ON causes overnight battery drain and the pump running with the key off, while stuck OFF causes intermittent no-start / stalling. Other failures include inoperative wipers, dead door locks, non-working turn signals/high beams, phantom horn, and dead trailer lights. Root causes include water intrusion into the layered module and improperly spliced aftermarket accessories overloading circuits.

A well-documented problem on 2002-2006 Altima involves failure of the engine control module (ECM) relay, which can interrupt power to the ECM while driving or prevent the car from starting. Owners report sudden stalling, intermittent crank-no-start, or an engine that dies and restarts after cooling down. Nissan issued a safety recall because relay heat damage and internal failure could cause an unexpected engine stall.

Nissan's 10V517000 recall reaches the 2005 and 2006 Frontier pickup. At issue is the ECM relay contained in the Frontier's Intelligent Power Distribution Module assembly. The relay's diode uses a silicon molding to reduce electrical current noise, but Nissan found the relay may allow silicon vapor to form; as silicon evaporates from that molding, arcing deposits silicon oxide on the relay contact. According to Nissan, this can cause the engine to stall — the reason the campaign was filed as a safety recall rather than a service bulletin. Note that the 747,480 units listed apply to the campaign as a whole, which spans several Nissan and Infiniti models.

Nissan recall campaign 10V-517/PC068 exactly covers 2005-2006 Xterra. Oxidation on ECM-relay electrical contacts in the IPDM can interrupt ECM power, cause engine-performance problems and permit stalling at low engine speed. The campaign replaces the relay with a new one after VIN eligibility is confirmed. The frozen silicon-evaporation narrative is more specific than the campaign bulletin and is not needed to support this indexed identity.

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.