P0697 Sensor C reference voltage open circuit

P0697 – OBD-II Trouble Code Technical Description

Sensor C reference voltage circuit is open

What does the fault code mean P0697?

This P0697 diagnostic code is a generic transmission code (DTC) that applies to vehicles equipped with the OBD-II system. Although it is general in nature, the specific repair steps may vary depending on the make and model of the vehicle.

1. The P0697 code indicates an open circuit "C" for a specific sensor in the vehicle's system, often associated with the automatic transmission, transfer case, or differential.
2. When diagnosing a P0697 code, it is important to look for additional specific sensor codes as they may provide additional information about the problem.
3. Checking the location and function of the sensor in question for a specific vehicle make and model may be necessary for an accurate diagnosis.
4. The P0697 code can occur due to an error in the PCM (engine control module) programming, so this aspect should be taken into account.
5. To successfully resolve a P0697 code, you must scan the vehicle with an OBD-II code reader, diagnose and repair the circuit faults, then clear the codes and ensure the PCM is in Ready mode.
6. If the PCM enters Ready mode after clearing the codes, this may indicate a successful repair. If the PCM does not enter ready mode, the problem should be further diagnosed.
7. Note that the Malfunction Indicator Light (MIL) may come on, but sometimes it will take several driving cycles with the malfunction for it to become active.
8. In case of complex and intermittent faults associated with error P0697, it is recommended to contact a service center for professional diagnosis and repair.
9. This P0697 code is related to problems in the computer output circuit, and it can occur due to internal failures in the computer.

Please note that the exact repair steps may vary depending on the make and model of your vehicle, so it is recommended that you consult official repair manuals or consult a professional mechanic to accurately diagnose and repair the P0697 code.

Possible reasons

This P0697 code may occur due to the following reasons:

1. Open circuits and/or connectors.
2. Defective or blown fuses and/or fuses.
3. Faulty system power relay.
4. Bad sensor.
5. Damaged, open or shorted wiring and connectors between control modules.
6. Broken or shorted wiring and connectors between engine sensors.
7. Some faults in the engine control module.
8. The engine control module (ECM) is faulty.
9. ECM wiring harness is open or shorted.
10. Poor ECM circuit.
11. The sensor is shorted in the 5 V circuit.

These reasons indicate various potential problems that could cause the P0697 code. To accurately determine the cause, additional diagnostics and testing of each of the listed elements is necessary.

What are the symptoms of a fault code? P0697?

The severity of the P0697 code may vary depending on the sensor circuit that is open. However, it is important to also consider other stored codes and symptoms to determine the severity of the problem. Here are some of the symptoms associated with the P0697 code:

1. Inability to switch the gearbox between sport and economy modes.
2. Gear shifting problems.
3. Delay or failure to engage the transmission.
4. Transmission failure when switching between four-wheel drive and four-wheel drive modes.
5. Problems with the transfer case when shifting from low to high gear.
6. Front differential not engaging.
7. No front hub engagement.
8. Erratic or non-functional speedometer/odometer.

It is important to note that symptoms may vary depending on the specific problem and vehicle make/model. Therefore, the severity of the problem will be determined based on specific symptoms and additional diagnostic data.

How to diagnose a fault code P0697?

To resolve trouble code P0697, follow these steps:

1. Check for damaged wiring or components and replace them if necessary.
2. Repair faulty control modules as required.
3. If the engine control module (ECM) is found to be faulty, replace it or repair it.
4. Clear all fault codes and test drive the vehicle.
5. After the test drive, perform a rescan to check if any codes appear again.

To diagnose a P0697 code, you will need access to a diagnostic scan tool, a digital volt/ohm meter (DVOM), and a reliable source of information about your vehicle, such as All Data DIY. A portable oscilloscope can also be useful in some cases.

Check the fuses and fuses in the system, especially when the circuit is under full load, as blown fuses may be a sign of a short circuit.

Also perform a visual inspection of the wiring harnesses and connectors associated with the sensor system and replace any damaged or burnt components.

After clearing the trouble codes and test driving the vehicle, rescan it to ensure the P0697 code does not return.

Additionally, if there is no reference voltage signal at the sensor connector, check the circuit resistance and continuity between the sensor and the PCM, and replace open or shorted circuits as necessary.

Please note that the P0697 code is often provided in support of more specific codes and may be transmission related.

Diagnostic errors

Errors in diagnosing P0697 may include the following:

1. Not paying enough attention to multiple codes: One common mistake when diagnosing P0697 is not paying enough attention to other stored trouble codes in the vehicle. P0697 is often related to the transmission, but the error can also relate to other components. By overlooking other codes, the mechanic may miss possible problems that also affect the vehicle's performance.
2. Incorrect Component Replacement: In cases of misdiagnosis, the mechanic may replace components that are not actually faulty. This may lead to unnecessary costs and failure to correct the problem.
3. Misinterpretation of symptoms: Incorrect identification of symptoms associated with P0697 may lead to misdiagnosis. The mechanic must carefully analyze the symptoms of the malfunction and interpret them correctly for an accurate diagnosis.
4. Overlooked Electrical Tests: Since P0697 is related to electrical circuits, insufficient attention to checking wiring, connectors and fuses may result in missing the real cause of the problem.
5. Unaccounted for Updates and Recalls: Sometimes the P0697 code can be caused by known problems for which there are already updates or recallations from the manufacturer. A diagnostic error may lie in ignorance of such updates and their application.
6. Incorrect handling of multiple drive cycles: For some vehicles, it may take several successful drive cycles after the problem is resolved to clear the P0697 code. Incorrect assessment of this factor can lead to misdiagnosis.

Eliminating these errors and correctly diagnosing P0697 requires careful analysis, checking electrical components, taking into account all stored fault codes and, if necessary, referring to documentation and manufacturer's sales information.

How serious is the fault code? P0697?

Trouble code P0697 is serious and can affect the normal functioning of your vehicle, especially if it is related to the transmission or other critical systems. This code indicates a problem in the sensor's reference voltage "C" circuit, and this can lead to various problems, such as:

1. Delay or inability to change gears.
2. Problems engaging or switching between XNUMXWD and XNUMXWD modes.
3. Unstable speedometer and odometer.
4. Failures in the operation of gears, differentials and other systems associated with the transmission of torque.

Based on this, P0697 should be considered a serious code that requires immediate attention and diagnosis. If left unaddressed, this problem can cause additional damage and degrade your vehicle's performance, as well as pose a potential safety hazard on the road. Therefore, it is recommended that you contact a qualified mechanic or service center for diagnosis and repair.

What repair will help eliminate the code? P0697?

Resolving the P0697 code will require diagnosing and possibly replacing or repairing components associated with the sensor "C" reference voltage circuit. Here is a list of potential repairs that may help resolve this code:

1. Sensor replacement: If the sensor associated with the reference voltage “C” is identified as faulty, it should be replaced with a new and functional one.
2. Wiring Inspection and Repair: Inspect the wiring and connectors associated with the “C” voltage reference circuit. Replace or repair any damaged or broken wires.
3. Checking fuses: Check the condition of fuses and fuses, especially those associated with the circuit. Replace blown fuses.
4. Diagnose Control Modules: If the problem persists after replacing the sensor, it may be necessary to diagnose and, if necessary, repair the control modules associated with the system.
5. Checking the reference voltage: Use a digital volt/ohm meter (DVOM) to check for reference voltage at the sensor connector. If there is no reference voltage, examine the circuit to find the cause of the open.
6. Resistance Test: Use the DVOM to test the resistance of the sensor and circuit. If the sensor does not meet manufacturer specifications, replace it.
7. PCM Reprogramming or Replacement: In rare cases, if the problem is related to the programming or failure of the PCM (engine control module), the module may need to be reprogrammed or replaced.

Please note that for an accurate diagnosis and resolution of the problem, it is recommended that you contact qualified mechanics or service centers equipped with the appropriate equipment to diagnose the vehicle.

What is P0697 Engine Code [Quick Guide]

P0697 – Brand-specific information

Trouble code P0697 is a generic code that can apply to different makes of vehicles. Depending on the manufacturer and model of the vehicle, this code may be associated with various sensors and systems. Below is a list of some car brands where this code may occur:

1. Ford – P0697: Engine coolant temperature sensor 2, feedback circuit disabled.
2. Chevrolet – P0697: Fuel system feedback control error.
3. Honda – P0697: Monitoring the appearance of input data from the low pressure boost pressure sensor (MAP).
4. Toyota – P0697: Engine control module (ECM) internal control error.
5. Volkswagen – P0697: Turbine pressure sensor signal low.
6. Nissan – P0697: Signal error from turbine pressure sensor.
7. BMW – P0697: Turbine sensor circuit failure.
8. Mercedes-Benz – P0697: Inappropriate voltage or resistance in the diesel throttle control circuit.

Please remember that this code may have different meanings and interpretations depending on the specific model and year of the vehicle. To accurately determine the code value for your car, it is recommended to use a diagnostic scanner or contact a service center that specializes in your car brand.