P0685 on Suzuki Wagon R: ECM/PCM Power Relay Control Circuit/Open

Short answer: P0685 means “ECM/PCM Power Relay Control Circuit/Open”. The car’s computer has found a fault in the ECM system and turns on the Check engine light (MIL). First check: check all battery and ECM power and earth connections first.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code

P0685

System

ECM

Dashboard light

Check engine light (MIL)

Also sold as

Maruti Suzuki Wagon R, Suzuki Karimun Wagon R (Indonesia)

Applies to

Generic OBD-II meaning. Not every code is used by this car.

Confidence

medium (generic OBD-II definition, not checked against the factory manual for this car)

Source

obd-codes.com

Symptoms and when it is set

1. Check engine light on

Likely causes

1. Potential causes for this code to set are
2. A defective PCM power relay
3. A blown fuse or fusible link
4. Corroded or damaged wiring or wiring connectors (especially near the PCM relay)
5. Faulty ignition switch
6. Partially or totally disconnected electrical terminal at the ignition switch
7. Loose or corroded battery cable ends

What to check, in order

1. Check all battery and ECM power and earth connections first
2. Read every stored code; an ECM fault is rare, wiring faults are common
3. Have a specialist confirm before replacing the ECM

Related on this car

• All fault codes for this car
• Warning lights
• Where the parts are (parts map)
• Common problems

Same code on other cars

• P0685 · Toyota Corolla (11th gen, E170)
• P0685 · Toyota Corolla (10th gen, E140)
• P0685 · Honda City (5th gen, GM2)
• P0685 · Honda Civic (10th gen, FC)
• P0685 on all cars compared

← P0657 P0700 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.