P0691 OBD Error Code: Problem & Solutions

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The P0691 error code can be defined as Cooling Fan 1 Relay Control Circuit Low. If an inappropriate level of voltage would be detected by the powertrain control module in the electric cooling fan control circuit, then the P0691 trouble code would start appearing. The level can be sometimes too high and on the other hand sometimes extremely low.

Do you want to gain some more knowledge about the P0691 trouble code? If the voltage would vary by more than 10% of the vehicle manufacturer parameters, then the P0691 trouble code would start triggering up.

What causes this problem with the Cooling Fan 1 Relay Control Circuit Low?

• The engine coolant temperature sensor might be quirky
• The fuse might blow because of shorted or open electrical wiring
• There can be some flaws in the cooling fan relay
• Faults in the cooling fan motor
• There can be some electrical connectors which have been corroded or might have become loose

1. Powertrain Control Module - Did your mechanic just found out that there is some fault in the Powertrain Control Module? Buy top notch Powertrain Control Module from us at economical prices.
2. Electronic Control Unit - A broken Electronic Control Unit can cause a lot of issues. It would be nice if you get it replaced on time.
3. Engine Control Module - Everything is fine with the Electronic Control Unit and still OBD code P0691 flashing? Then there is definitely some fault with the Engine Control Module. Get it checked and replace if needed.
4. Radiator Fan Assembly - Radiator Fan Assembly is an important car part which should never be neglected. May be there is some fault in griffin radiator due to which P0691 code may start flashing.
5. Electric Cooling Fan - A faulty Electric Cooling Fan can be troublesome. You can always rely on us as we have best auto parts for our customers.
6. Automatic Transmission Sensor - If everything is alright with PCM, then there is surely some defect in Automatic Transmission Sensor. Get it replaced before the situation gets worse.
7. Auto Transmission Shift Solenoid - P0691 code can display due to some issues in the Auto Transmission Shift Solenoid. So, it is very important to replace the Auto Transmission Shift Solenoid with us at equitable prices.

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P0691 code by mentioning some major symptoms below:

Common Symptoms

• The car engine may overheat
• Car air conditioning system may not function properly
• There can be an appearance of the check engine light

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 P0691:

• First of all, the car mechanic should verify the code by using a scanner
• After that the wiring schematic for the vehicle should be obtained
• You can always repair and update the PCM wiring and connectors
• Carefully inspect the engine cooling fan and its voltage and grounding
• If there are any issues in the cooling fan relay and circuit, then it should be repaired properly
• Inspect the engine temperature readings as it should lie between the manufacturer’s parameters
• Replace the engine coolant temperature sensor

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Here are some steps which you should follow in order to diagnose this fault code:

• The trouble code P0691 can be diagnosed by using an OBD-II scanner, digital ohm meter and an infrared thermometer
• Diagnosing this can be somewhat challenging without knowing the manufacturer's specs regarding cooling fans for the engine and the air conditioner.
• After that a scanner is used by the mechanic or technician to activate the engine fan and check voltage and grounding of the fan motor.
• No voltage means the system fuses must then be tested, and if the fuses are acceptable, the fan relay must be checked.
• The voltage at the connector must be within parameters of the manufacturer
• The engine temperature readings must then be tested and if not within the manufacturer specs, it is likely a defective engine coolant temperature sensor
• Generally, the source of the code would be revealed by the series of tests
• Then the mechanic will repair an open or shorted circuitry as detected by the diagnostics before rechecking with the scanner

Common Mistakes When Diagnosing The P0691 Code

• A most common mistake which can be made during diagnosing the P0691 trouble code can be to replace the cooling fan motors initially without doing the complete diagnosis
• Make sure that the mechanic does a proper test before replacing the primary fan motor directly

P0692 - Fan 1 Control Circuit High