P0699 Sensor C Circuit High Reference Voltage

P0699 – OBD-II Trouble Code Technical Description

Sensor “C” Circuit High Reference Voltage

What does the fault code mean P0699?

This diagnostic trouble code (DTC) P0699 is a generic code that applies to vehicles equipped with the OBD-II system. Despite the general nature of the code, the specifics of the repair actions may vary depending on the make and model of the car.

If a P0699 code is detected, consider the following repair steps:

1. Checking wiring and connectors: The first step is to check the wiring and connectors associated with the sensors and system. If the wiring or connectors are damaged or corroded, they must be replaced.
2. Restoring faulty control modules: If control modules are found to be faulty, they must be repaired or replaced as required.
3. Replacing a faulty engine control module (ECM): If the ECM is identified as the source of the problem, the faulty module should be replaced or repaired.
4. Clearing codes and test drive: After completing the repair work, you should clear the fault codes and test drive the vehicle to see if the codes appear again.
5. Repeated Diagnosis: After completing the repair work, it is recommended to rescan the vehicle using a diagnostic scanner to ensure that DTCs no longer appear.

Remember that the P0699 code can occur in different makes and models of vehicles, and its interpretation may vary. To accurately determine the cause and repair actions, it is recommended to contact a service center or a specialist for your car brand.

Possible reasons

Possible causes of this engine code include:

• Voltage-related shorted circuits and/or connectors.
• Faulty sensor.
• Errors or malfunctions in PCM (engine control module) programming.
• The engine control module (ECM) itself is faulty.
• Poor electrical contact in the ECM circuit.
• The sensor on the 5V circuit may be shorted.
• The ECM wiring harness may be open or shorted.

To accurately determine the cause and resolve this trouble code, it is recommended to conduct a detailed diagnosis using a diagnostic scanner and, if necessary, contact a professional auto repair specialist.

What are the symptoms of a fault code? P0699?

The relevance of a stored P0699 code depends on which sensor circuit is in the high reference voltage condition. To more accurately assess the severity of the problem, the accompanying fault codes must also be taken into account. Symptoms associated with a P0699 code may include:

• Delay or failure to engage the transmission.
• Inability to shift the transmission between sport and economy modes.
• Gear shifting problems.
• Transmission failure when switching between four-wheel drive and four-wheel drive modes.
• Problems with the transfer case when shifting from low to high gear.
• Front differential not engaging.
• No front hub engagement.
• Unstable or inoperative speedometer and odometer.

In addition, the following symptoms are possible:

• Check Engine light on.
• Hard start or lack of engine start.
• Rough engine operation.
• Engine misfires.
• Reduced overall fuel economy.
• Lack of traction in the car.

For more accurate diagnosis and elimination of the problem, it is recommended to conduct a detailed check using a diagnostic scanner and, if necessary, contact a car repair specialist.

How to diagnose a fault code P0699?

To diagnose DTC P0699, follow these steps:

1. Prepare the necessary equipment, including an OBD-II diagnostic scanner/code reader, a digital volt/ohm meter (DVOM), and some device to back up the PCM and other controller data. It is also necessary to have access to the factory wiring diagram and CAN processor diagrams.
2. Begin your diagnosis by carefully visually inspecting the connectors and wiring. Replace or repair any damaged, disconnected, shorted or corroded wiring or connectors.
3. Connect the scanner to the vehicle's diagnostic port and write down any stored trouble codes. It is also worth recording freeze frame data, which can be useful in diagnostics.
4. After that, take the car for a test drive and check if the codes return. If the code does not clear immediately, it may be an intermittent problem and sometimes it will take time for the problem to appear again.
5. At the end of the test drive, perform a further check for loose or disconnected engine or transmission ground cables, straps or wires that may have been inadvertently left unconnected from previous repairs.
6. If the problem remains unclear after completing the above steps, resort to using a digital volt/ohm meter to check the reference voltage and resistance in the circuit, as well as continuity between the sensor and the PCM. Replace any shorted circuits if necessary.
7. If the sensor uses an electromagnetic reciprocating signal, use an oscilloscope to monitor the current data, focusing on spikes, glitches, and overloaded circuits.
8. Please note that the P0699 code is often provided as additional information to more specific codes. Therefore, performing a detailed diagnosis and addressing the root cause indicated by more specific codes may help resolve the problem associated with P0699.

Diagnostic errors

Common mistakes when diagnosing code P0699:

1. Incorrect Code Interpretation: If you have a vehicle equipped with a CAN system, the P0699 code may sometimes appear due to a response to a communication failure between the modules. This can lead to misinterpretation of the code and erroneous replacement of components that are not actually related to the CAN system and are not the source of the problem.
2. Lack of Detailed Diagnostics: Some vehicles equipped with a CAN system may display a P0699 code as additional information without providing detailed information about the specific problem. The pitfall is that many technicians may attempt to solve the problem without conducting a detailed diagnosis, which can lead to replacing unnecessary components and unnecessary costs.

When diagnosing a P0699 code, it is important to consider that it may be related to the CAN system, ruling out problems in that system, as well as conducting a more detailed test to determine the source of the problem and avoid unnecessary component replacements.

How serious is the fault code? P0699?

Trouble code P0699 is important to take seriously because it indicates problems in the sensor reference voltage, which can affect the operation of various vehicle systems, including the transmission, gearbox, and other critical components. This problem can lead to delays in shifting gears, rough engine running, transmission failure, and other unwanted symptoms.

The exact severity of the P0699 code may vary depending on the specific make and model of the vehicle, as well as other factors. It is important to take into account the symptoms that accompany this code and perform diagnostics to determine the source of the problem. It is recommended that you contact a qualified auto mechanic or service center for detailed diagnostics and repairs to prevent possible serious consequences for the operation of the vehicle.

What repair will help eliminate the code? P0699?

To resolve trouble code P0699, you will need to complete the following steps depending on the result of your diagnosis:

1. The first step is to check and, if necessary, repair damaged wires, connectors and components in the circuit associated with the “C” sensor. Be sure to eliminate any mechanical damage and corrosion in the wiring and connectors.
2. If the problems are related to the sensors or processors of the CAN system, then these must also be diagnosed and, if necessary, repaired or replaced.
3. In case the P0699 code has not yet been resolved, do not worry. You can turn to us and we offer a wide range of quality auto parts including northern radiators, auto solenoids, gear shift solenoids, electric radiator fans, pressure control solenoids, PCMs, auto cooling fans and much more. Our products are available at competitive prices and can help you solve your P0699 problem.

It's important to note that the exact repair steps may vary depending on the specific vehicle and the nature of the problem. To ensure proper repairs, it is best to contact a professional auto mechanic or service center for a detailed diagnosis and solution to the problem.

What is P0699 Engine Code [Quick Guide]

P0699 – Brand-specific information

Trouble code P0699 is a common OBD-II code and can be found in different makes of vehicles. This code is related to the high reference voltage of the “C” sensor in the circuit and may require various repairs depending on the specific make and model of the vehicle. There are no specific explanations for individual brands here, since diagnostics and repairs will depend on the characteristics of each car.

For accurate information on specific makes and models of cars, it is best to contact an authorized service center or repair specialist for a specific car brand. They will be able to provide the most detailed instructions and recommendations for troubleshooting the P0699 code for your specific vehicle.