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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 for $154.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $50.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
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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.
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.
A P0690 code can have a variety of causes, but the most common are:
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.
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.
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.
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.
The most common repairs for a P0690 are as follows:
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.
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