What is code P0689?

What is code P0689?

OBD-II Code P0689 is defined as a ECM/PCM Power Relay Sense Circuit Low. The engine computer (PCM) power relay controls battery voltage to the PCM. If the PCM detects an incorrect voltage signal from the power relay, it will set code P0689.

How do I fix code P0688?

What repairs can fix the P0688 code?

  1. Repair any loose or damaged battery cables.
  2. Fully charge the battery.
  3. Replace battery if needed.
  4. Replace damaged or blown fuses.
  5. Repair or replace damaged or corroded electrical wires and related connectors.
  6. Repair loose or shorted connections.
  7. Replace damaged or defective ECM/PCM relay.

How do I fix code P0685?

What repairs can fix the P0685 code?

  1. Repair of shorts or bad terminals or connections.
  2. Replacement of the powertrain control module relay.
  3. Underhood junction block replacement (fuse box)
  4. Replacement of battery cables and/or connectors.
  5. Fuse replacement.

WHAT IS A engine control module relay?

What Is An ECM Power Relay? ECM stands for engine control module – the computer that makes your entire car function on its own. The ECM power relay monitors and delivers power to the ECM which in turn decides how virtually every other component in your engine runs.

What causes code P1682?

The P1682 code means that there is a problem with the ignition switch circuit. This can be caused by a number of things, including a bad ignition switch, a wiring problem, or a problem with the ECM. If you see this code, it is important to take your car to a mechanic and have it inspected.

What does P0688 mean?

OBD-II Code P0688 is defined as a ECM/PCM Power Relay Sense Circuit/Open. The engine computer (PCM) power relay controls battery voltage to the PCM. If the PCM detects an incorrect voltage signal from the power relay, it will set code P0688. Driving with this trouble code is not recommended.

Can you bypass ASD relay?

While it’s not smart to bypass an ASD relay because it serves an important safety role (it prevents the engine to overrev), sometimes it can stop you from starting your car. The easiest way to bypass an ASD Relay is with a wire.

What is ECM PCM power relay?

The engine control module (ECM) or powertrain control module (PCM) runs various processes in the engine and (in the case of the PCM) the transmission to achieve maximum efficiency. The PCM regularly checks the voltage condition in the power relay control circuit that delivers battery voltage to the ECM/PCM.

Where is the ECM power relay?

The relay is located in the engine main fuse relay control box. The defective ECM-power relay is removed from the control box by pulling it straight up and out of socket. The new ECM-power relay is installed into the socket and the engine scanned for codes.

Where is the ECM power relay located?

How do I know if my ECM relay is bad?

If the ECM or it’s relay fail, the entire engine management system will be left without power and will not function as a result. A bad relay may cause the vehicle to crank, but not start, or sometimes not even crank at all.

How do I fix my Dodge P1682 code?

DTC P1682: CHARGING SYSTEM VOLTAGE TOO LOW

  1. Ensure battery is fully charged and generator drive belt is in good condition and properly adjusted before proceeding.
  2. Ensure engine is idling and at normal operating temperature.
  3. Shut engine off.
  4. Ensure engine is idling and at normal operating temperature.
  5. Shut engine off.