Error Code P0690: What It Means & What To Do?

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The trouble code P0690 can be explicated as ECM/PCM Power Relay Sense Circuit High. This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle to another. 

The P0690 is an OBD-II generic code for the engine control module which detects that there are some flaws in the ECM/PCM power relay sense circuit. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

What causes this problem with the ECM/PCM Power Relay Sense Circuit High?

• Imperfect ECM/PCM relay
• Blown ECM/PCM fuse
• Faulty ECM/PCM grounds
• Poor battery
• There might be some defaults in the battery cables
• The ECM/PCM might not function properly

1. Oil Pressure Gauge - If the oil filter is blocked, then it might cause an oil pressure gauge to read high. Then it is essential to replace the filter and then the oil should also be changed. We have best oil pressure gauge with us.
2. Engine Control Module - The solenoid might cause a short in the engine control module because of corrosion in the solenoid or the wire running from the solenoid to the ECM harness.
3. Ignition Coil - Many a times your car won’t be able to start because of some quirks in the ignition coil. Visit us to buy best quality ignition coil online.
4. Electronic Control Unit - The ECU power management control module keeps in check the hybrid battery charging functions. If the ECU is faulty, the battery pack will not be able to properly get charged and thus, the ECU might need replacement.
5. Car Battery - If the battery is not functioning properly, the may overheat and underperform. Also, it may have difficulty in charging and might discharge fast. Thus, replacements are in order. Buy a new battery now!
6. Powertrain Control Module - A trouble with the PCM would mean that it is unable to determine the right fuel mixture and would send the car engine either more or less fuel than it requires. Now when the engine gets more, the carbon emission would increase and fuel economy would drop. In case of the opposite, the engine will choke, stutter, and might start stalling sometimes.
7. Diagnostic Tool - Usually any OBD code problem requires deep insight into the problem and high grade tools in order to fix it properly. Thus, buy quality diagnostic tools form us!

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0690 here:

Common Symptoms

• Illumination in the service engine soon light
• The automobile might not start or may not shut off when turning the key to start or turn off the vehicle
• The OBD2 scanner port might not be able to access the engine control module

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0690:

• Repair or replace the quirky ECM/PCM fuses
• The malfunctioning ECM/PCM should be repaired or replaced as per the need
• Carefully adjust the faults in the battery cables
• The ECM/PCM relay should be restored to working order
• Recondition the non-functioning ECM/PCM power wiring 

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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

There are a lot of potential causes for a P0690, which is the reason why the car mechanic should start easy. First of all he should clear the code and reset the ECM/PCM.

Now if the code is not returning back again, then the technician should ensure all electrical connections for the battery and ECM/PCM are tight and it good condition.

He should repair them as per the requirement. Check and clean the engine grounds as per the requirement. But still if the code is returning back again, then test the ECM/PCM relay by using a digital multimeter.

If the relay is defective, then it should be restored. There can be some cases when the ECM/PCM should be restored.

Common Mistakes When Diagnosing The P0690 Code

• There can be a failure in the powertrain control module
• Defaults in the powertrain control module power relay
• Some issues related to the wiring