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P0698 Cadillac Code - 5V Reference 3 Circuit Low Voltage

Quick Answer

The P0698 diagnostic trouble code (DTC) for Cadillac vehicles refers to a problem with the 5V reference 3 circuit, indicating that the voltage level in this circuit is lower than the expected range. Common causes include Faulty Wiring: Damaged or corroded wiring in the 5V reference 3 circuit can lead to a drop in voltage levels, Failed 5V Reference Voltage Regulator: A malfunctioning voltage regulator responsible for maintaining the 5V reference voltage can cause low voltage issues, Shorted Sensor: A shorted sensor connected to the 5V reference 3 circuit can draw excess current, resulting in low voltage levels. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0698 Cadillac indicates 5V Reference 3 Circuit Low Voltage.
Common causes
Common causes include Faulty Wiring: Damaged or corroded wiring in the 5V reference 3 circuit can lead to a drop in voltage levels, Failed 5V Reference Voltage Regulator: A malfunctioning voltage regulator responsible for maintaining the 5V reference voltage can cause low voltage issues, Shorted Sensor: A shorted sensor connected to the 5V reference 3 circuit can draw excess current, resulting in low voltage levels.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0698 Cadillac Description

The P0698 diagnostic trouble code (DTC) for Cadillac vehicles refers to a problem with the 5V reference 3 circuit, indicating that the voltage level in this circuit is lower than the expected range. In modern vehicles, the Engine Control Module (ECM) or Powertrain Control Module (PCM) relies on various reference voltage signals to properly operate and control different sensors and components within the vehicle's systems. The 5V reference voltage is a crucial signal that ensures the correct functioning of numerous sensors and modules throughout the vehicle.

OBDII Code P0698 Cadillac - 5V Reference 3 Circuit Low Voltage
P0698 Cadillac Code - 5V Reference 3 Circuit Low Voltage

Common Causes of P0698 Cadillac

  1. Faulty Wiring: Damaged or corroded wiring in the 5V reference 3 circuit can lead to a drop in voltage levels.
  2. Failed 5V Reference Voltage Regulator: A malfunctioning voltage regulator responsible for maintaining the 5V reference voltage can cause low voltage issues.
  3. Shorted Sensor: A shorted sensor connected to the 5V reference 3 circuit can draw excess current, resulting in low voltage levels.
  4. ECM/PCM Malfunction: A malfunctioning ECM or PCM can disrupt the 5V reference 3 circuit, leading to low voltage readings.

Symptoms of P0698 Cadillac

  1. Check Engine Light: The most common symptom associated with the P0698 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Engine Performance: The vehicle may exhibit reduced engine performance, including hesitation, stalling, or rough idling.
  3. Inaccurate Sensor Readings: Sensors reliant on the 5V reference 3 circuit may provide incorrect readings, leading to potential drivability issues.
  4. Transmission Issues: The transmission may experience shifting problems or fail to engage properly due to the low voltage in the circuit.

How to Fix P0698 Cadillac

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the wiring, connectors, and sensors in the 5V reference 3 circuit.
  2. Repair or Replace Wiring: Repair any damaged wiring or connectors in the circuit and ensure proper connections to restore the correct voltage levels.
  3. Check and Replace Sensors: Inspect sensors connected to the 5V reference 3 circuit for shorts or malfunctions, replacing any faulty sensors as needed.
  4. Test Voltage Regulator: Check the voltage regulator responsible for maintaining the 5V reference voltage and replace it if it is faulty.
  5. Clear Codes and Test Drive: After completing the repairs, clear the trouble codes from the ECM/PCM memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0698 Cadillac

The typical repair costs for addressing a P0698 code on a Cadillac can range from $150 to $500, depending on the specific cause of the issue and the parts/labour required for the repair. This estimate includes the cost of diagnostic testing, replacement parts, and labour charges. However, the actual cost may vary based on the location of the repair shop, the vehicle's make and model, and the extent of the repairs needed. It is advisable to consult with a qualified mechanic or repair shop to obtain an accurate estimate for your specific situation.

What does this mean?

Tech Notes for P0698 Cadillac

Disconnecting one component at a time from the affected 5 Volt reference circuit while observing the scan tool 5 Volt Reference Circuit Status parameter may help locate the fault. The scan tool parameter will change from Malfunction to OK when the source of the fault is disconnected. If all 5 Volt reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.



The 5 Volt reference 3 circuit provides 5 Volt to the following sensors: (Some models may have different sensors, please consult the factory service manual for the list of sensors for your model and year)



- Accelerator pedal position sensor 2

- Manifold absolute pressure sensor

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0698 Cadillac Code

1. What are the common symptoms of OBDII code P0698 in a Cadillac related to the 5V Reference 3 Circuit Low Voltage?

The common symptoms include engine misfires, rough idling, poor acceleration, and potential issues with the vehicle's electronic components.

2. What can cause the OBDII code P0698 in a Cadillac indicating 5V Reference 3 Circuit Low Voltage?

Possible causes include a faulty 5V reference circuit, damaged wiring or connectors, a defective sensor or component connected to the circuit, or a problem with the Engine Control Module (ECM).

3. How can I diagnose the OBDII code P0698 in my Cadillac with the 5V Reference 3 Circuit Low Voltage?

Diagnosis typically involves using a multimeter to check the voltage levels on the 5V reference circuit, inspecting the wiring and connectors for any damage, and testing the sensors or components connected to the circuit for proper functionality.

4. Is it safe to continue driving my Cadillac with the OBDII code P0698 indicating 5V Reference 3 Circuit Low Voltage?

It is not recommended to drive the vehicle with this code present as it can lead to further damage to the engine or electronic components. It is best to address the issue promptly.

5. How can I repair the OBDII code P0698 in my Cadillac related to the 5V Reference 3 Circuit Low Voltage?

Repairing the issue may involve repairing or replacing damaged wiring or connectors, replacing any faulty sensors or components, or reprogramming the Engine Control Module (ECM) if necessary.

6. Can a DIY enthusiast fix the OBDII code P0698 indicating 5V Reference 3 Circuit Low Voltage in a Cadillac?

While some simple checks like inspecting wiring and connectors can be done by a DIY enthusiast, diagnosing and repairing this code may require advanced automotive knowledge and tools. It is advisable to seek professional help if needed.

7. Will resetting the fault codes make the OBDII code P0698 go away in a Cadillac?

Resetting the fault codes may temporarily clear the code, but if the underlying issue causing the 5V Reference 3 Circuit Low Voltage is not addressed, the code is likely to reappear after driving the vehicle.

8. How much does it typically cost to repair the OBDII code P0698 in a Cadillac due to the 5V Reference 3 Circuit Low Voltage?

The cost of repair can vary depending on the specific cause of the issue and the labor rates in your area. It's best to consult a mechanic for an accurate estimate.

9. Can extreme weather conditions affect the occurrence of OBDII code P0698 in a Cadillac related to 5V Reference 3 Circuit Low Voltage?

Extreme temperatures or weather conditions can potentially impact electrical components and wiring, which may contribute to the occurrence of this code. It's essential to ensure proper insulation and protection of the electrical system.

10. How often should I have my Cadillac checked for potential issues like the OBDII code P0698 related to 5V Reference 3 Circuit Low Voltage?

Regular maintenance and inspections are recommended to catch any issues early on. If you notice any symptoms or warning lights, it's crucial to have the vehicle checked by a professional promptly.

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