P0690 OBD-II Trouble Code: ECM/PCM Power Relay Sense Circuit High

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Cost of diagnosing the P0690 code

P0690 is a diagnostic trouble code (DTC) for "ECM/PCM Power Relay Sense Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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P0690 trouble code definition

A P0690 trouble code is related to a vehicle’s engine control module (ECM) or powertrain control module and its direct power supply from the battery.

What the P0690 code means

P0690 is an OBD-II generic code for a high voltage problem with the power supply to the ECM/PCM. This means the vehicle’s computer is not receiving voltage that is within the manufacturer’s parameters.

What causes the P0690 code?

A P0690 code can have a variety of causes, but the most common are:

What are the symptoms of the P0690 code?

A P0690 code will typically have night and day symptoms. Either there will be just a Check Engine Light, or the vehicle will simply not start.

How does a mechanic diagnose the P0690 code?

Because there are a number of potential causes for a P0690, your mechanic will start easy and clear the code and reset the ECM/PCM. If the code does not return, your mechanic will ensure all electrical connections for the battery and ECM/PCM are tight and it good condition - repairing as needed. Engine grounds will also be checked and cleaned as needed. If the code returns however, the ECM/PCM relay will need to be tested using a digital multi meter. If the relay is faulty, it will need to be replaced. In some cases, the ECM/PCM will need to be either reflashed or replaced.

Common mistakes when diagnosing the P0690 code

Because ECM/PCM replacements can be costly, this isn’t the best first move to make when dealing with a P0690. It’s important to test as many components as necessary and reset the ECM/PCM as needed.

How serious is the P0690 code?

This can either be serious or not so serious, and it depends on the condition of the vehicle when a P0690 is present. If there is a no-start condition, the problem could be more severe than if the code is illuminated and driving is normal.

What repairs can fix the P0690 code?

The most common repairs for a P0690 are as follows:

  • Replacing the ECM/PCM relay
  • Repairing ECM/PCM power wiring
  • Replacing ECM/PCM fuses
  • Replacing damaged battery cables
  • Replacing the ECM/PCM

Additional comments for consideration regarding the P0690 code

If a P0690 is present, you may have other codes accompanying it. Check the order in which these codes come up on a OBD-II scanner as the ones higher above may be the route cause of the P0690.

Need help with a P0690 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

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