P0636 Power Steering Control Circuit Low

P0636 – OBD-II Trouble Code Technical Description

Power steering control circuit low

What does the fault code mean P0636?

Code P0636 in the OBD-II system indicates a low signal level in the power steering control circuit. This code can occur in different makes of cars, including Saturn, Renault, Dodge, Ford, Nissan, Mercedes and others.

Modern power steering systems are adaptive and adjust the level of force depending on the speed of travel. This provides better handling and prevents steering from being too hard or unstable.

Code P0636 indicates problems in the control circuit of this system. If the powertrain control module (PCM) does not receive enough signals from the power steering, it sets this code and activates the check engine light. This may require several failure cycles before the indicator is activated.

The purpose of the power steering control circuit is to ensure proper fluid pressure in the power steering system. It also helps you adapt to different driving conditions, which is important for safe driving.

When a P0636 code occurs, it is important to perform diagnostics and repairs to prevent possible damage to the power steering and to ensure normal operation of the steering system.

Possible reasons

Causes of the P0636 code may include:

1. The power steering pressure sensor is faulty.
2. The power steering position switch is faulty.
3. The power steering switch is faulty.
4. Loose control module ground strap or broken ground wire.
5. Insufficient fluid level or leak.
6. The fuse or fuse link has blown (if applicable).
7. Corroded or damaged connector.
8. Faulty or damaged wiring.
9. Faulty PCM (engine control module).

The P0636 code may indicate one or more of the problems listed above are occurring and requires diagnosis to determine the specific cause.

What are the symptoms of a fault code? P0636?

Driver symptoms of P0636 include:

1. The MIL (Malfunction Indicator Light), also known as the check engine light, comes on.
2. The “Check Engine” light on the control panel lights up (the code is stored as a malfunction).
3. Possible steering problems such as:

• The engine stalls when turning the steering wheel at low speed.
• Difficulty or almost impossible to turn the steering wheel at low speed.
• Noises, howls, whistles or knocks made by the power steering pump.

1. In some cases, there may be no symptoms and the only sign may be a stored DTC.

The P0636 code is serious as it can lead to steering problems and it is recommended to fix it immediately if detected.

How to diagnose a fault code P0636?

To resolve code P0636, it is recommended to follow these steps:

1. Study TSB: The first step in the process of troubleshooting any problem is to review the vehicle-specific Technical Service Bulletins (TSBs) by year, model, and powertrain. This can save a lot of time and point you in the right direction.
2. Checking the power steering fluid level: Check the hydraulic fluid level and look for any leaks that could affect the pressure in the power steering system. Fluid pressure plays a key role in system operation.
3. Visual inspection of components and wiring: Inspect all components and wiring in the power steering control circuit for obvious defects such as scratches, scuffs, exposed wires, or burn marks. Carefully check connectors for corrosion and damaged contacts, including the power steering controller, sensors, switches and PCM.
4. Voltage test: Check the voltage ranges required on the power steering control circuit according to the vehicle-specific troubleshooting guidelines. Pay attention to power supplies and grounding. If there is no power supply or ground connection, check the integrity of wiring, connectors, and other components.
5. Continuity check: Check wiring continuity when power is removed from the circuit. Normal readings for wiring and connections should be 0 ohms. Resistance or lack of continuity indicates faulty wiring that requires repair or replacement.
6. Additional steps: Additional steps may be vehicle specific and require appropriate advanced equipment and technical data. For example, testing the power steering pressure sensor, power steering position switch, power steering pump and other components may require specialized tools and data.
7. Checking the PCM: If P0636 persists after following the steps above, you should check the PCM as it can sometimes be the cause of the problem.

Following these steps will help resolve P0636 and restore normal operation of the power steering system.

Diagnostic errors

When diagnosing a P0636 trouble code or any other error code, a mechanic may make a number of mistakes, including:

1. Incorrect interpretation of error code: The mechanic may misinterpret the error code or its meaning. This may lead to incorrect conclusions about the cause of the malfunction.
2. Insufficient diagnosis: The mechanic may not conduct a deep enough diagnosis and limit himself to only reading the error code. As a result, he may miss other problems that may be related to the main problem.
3. Defective sensors: A mechanic may mistakenly believe that the problem is caused by the sensors and replace them without further checking. It may be an unnecessary expense to replace functioning components.
4. Skipping Wiring and Connector Checks: One of the common causes of errors in car control systems is damage to the wiring or connectors. A mechanic may not thoroughly check the wiring and connectors, which can lead to undiagnosed problems.
5. Incomplete diagnosis: The mechanic may not complete the full diagnostic cycle and, without eliminating the cause, immediately proceed to replacing components. This may cause the error to reappear after replacement.
6. Incorrect repair or replacement of components: A mechanic may repair or replace components incorrectly, which not only will not solve the problem, but may also create new problems.
7. Incorrect interpretation of data from diagnostic equipment: Sometimes a mechanic may misinterpret the data received from the diagnostic equipment, which can lead to incorrect conclusions about the cause of the problem.

To avoid these mistakes, it is important that your mechanic has good diagnostic skills, uses quality diagnostic equipment, and follows the manufacturer's recommendations for diagnosing and repairing your specific make and model of vehicle.

How serious is the fault code? P0636?

Trouble code P0636, which is associated with a low signal in the power steering control circuit, is serious because it can affect the operation of the vehicle's steering system. The steering is one of the most important systems in your vehicle, and its proper operation is essential to safety and controllability.

Symptoms associated with this error code may include rough or unstable steering, or noises or sounds when turning the steering wheel. In practice, this may mean that the driver will have difficulty controlling the vehicle, especially at low speeds or when maneuvering.

Moreover, problems with steering can lead to danger on the road, as the driver may lose control of the car.

Therefore, if the P0636 code activates and you notice symptoms related to your steering, it is recommended that you contact a professional as soon as possible to diagnose and repair the problem. It is important to take steps to ensure your vehicle is safe on the road and that your steering is working properly.

What repair will help eliminate the code? P0636?

1. The first step is to check the level and condition of the fluid in the steering reservoir. If the level is low or the fluid has a strange color or smell, this could be the cause. Leaks should also be found and repaired.
2. Visually check the wiring and connectors associated with the steering control system. Look for damage, corrosion, or loose wires. Repair damaged components.
3. If the problem persists, use a voltmeter to test the voltage in the wiring. Make sure the voltage meets vehicle specifications.
4. Check the steering pressure sensor. If its resistance is abnormal, replace it.
5. Check the actual pressure generated by the power steering pump. If it is not normal, this may be the cause of the problem. But replacing a pump is a difficult task; it is better to leave it to professionals.
6. If after all this, the P0636 code still does not go away, there may be a problem with the electrical system. This may require PCM (engine control module) replacement and additional testing.

It is important to note that diagnosing and repairing the P0636 problem may require specialized equipment and knowledge, so for complex cases it is best to contact a professional mechanic or auto repair shop.

What is P0636 Engine Code [Quick Guide]

P0636 – Brand-specific information

List of car brands with code P0636:

1. Dodge/Chrysler/Jeep: P0636 – Serial ABS signal lost.
2. Ford: P0636 – Additional electronics control (AED): no communication.
3. Volkswagen / Audi: P0636 – Intake system control module – No communication with the control module.
4. BMW: P0636 – Carburetor adjustment – ​​Carburetor position is incorrect.
5. Chevrolet/GMC: P0636 – Steering Module Monitoring – No communication with BCM (Body Control Module).
6. Toyota: P0636 – Variable Exhaust Valve System – Communication with the ECM (Engine Control Module) is lost.

Please note that the meaning of the codes may vary slightly depending on the specific model and year of the vehicle.