P0699 2018 GMC Sierra Code - 5V Reference 3 Circuit High Voltage
Quick Answer
The P0699 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to a 5V Reference 3 Circuit High Voltage. Common causes include Faulty 5V Reference Voltage Regulator: A malfunctioning voltage regulator that controls the 5V reference circuit can lead to high voltage readings, Short Circuits: Wiring or connector issues causing a short circuit can result in high voltage on the 5V reference circuit, Sensor Malfunction: A faulty sensor connected to the 5V reference circuit can cause voltage irregularities. 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
- P0699 2018 GMC Sierra indicates 5V Reference 3 Circuit High Voltage.
- Common causes
- Common causes include Faulty 5V Reference Voltage Regulator: A malfunctioning voltage regulator that controls the 5V reference circuit can lead to high voltage readings, Short Circuits: Wiring or connector issues causing a short circuit can result in high voltage on the 5V reference circuit, Sensor Malfunction: A faulty sensor connected to the 5V reference circuit can cause voltage irregularities.
- 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.
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Code P0699 2018 GMC Sierra Description
The P0699 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to a 5V Reference 3 Circuit High Voltage. This code indicates that the voltage on the 5V reference circuit is higher than the normal operating range. The 5V reference circuit is a crucial component in the vehicle's electronic control system, providing a stable 5-volt reference voltage to various sensors and components throughout the vehicle. When this reference voltage exceeds the expected range, it can lead to erratic behavior in the vehicle's systems, potentially affecting engine performance, emissions, and overall drivability.
Common Causes of P0699 2018 GMC Sierra
- Faulty 5V Reference Voltage Regulator: A malfunctioning voltage regulator that controls the 5V reference circuit can lead to high voltage readings.
- Short Circuits: Wiring or connector issues causing a short circuit can result in high voltage on the 5V reference circuit.
- Sensor Malfunction: A faulty sensor connected to the 5V reference circuit can cause voltage irregularities.
- ECM/PCM Malfunction: A problem with the Engine Control Module (ECM) or Powertrain Control Module (PCM) can disrupt the 5V reference circuit.
Symptoms of P0699 2018 GMC Sierra
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
- Erratic Engine Performance: The vehicle may experience rough idling, stalling, or poor acceleration due to the high voltage on the 5V reference circuit.
- Inaccurate Sensor Readings: Faulty sensor readings, such as incorrect fuel levels, temperature readings, or speedometer inaccuracies, may occur.
- Electrical Issues: The vehicle's electrical system may exhibit strange behavior, such as flickering lights or malfunctioning gauges.
How to Fix P0699 2018 GMC Sierra
- Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and pinpoint the source of the high voltage on the 5V reference circuit.
- Inspect Wiring and Connectors: Check for any damaged or corroded wiring or connectors along the 5V reference circuit.
- Test Sensors: Verify the functionality of sensors connected to the 5V reference circuit to identify any faulty components.
- Replace Voltage Regulator: If the issue lies with the voltage regulator, replace it with a new one to restore proper voltage regulation.
- Clear Codes and Test Drive: After repairs are completed, clear the trouble codes from the ECM/PCM and test drive the vehicle to ensure the issue is resolved.
Cost to Fix P0699 2018 GMC Sierra
The typical repair costs for addressing a P0699 code on a 2018 GMC Sierra can range from $100 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates can vary between auto repair shops, with hourly rates typically ranging between $80 and $150. Factors such as location, vehicle make and model, and engine type can also influence the final repair costs. It's advisable to consult with a trusted mechanic or dealership for a more accurate estimate based on your specific circumstances.
Tech Notes for P0699 2018 GMC Sierra
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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Frequently Asked Questions about P0699 2018 GMC Sierra Code
1. What does the OBDII code P0699 mean on a 2018 GMC Sierra?
P0699 indicates a high voltage issue in the 5V Reference 3 Circuit, which provides power to certain engine sensors.
2. What are the common symptoms of a P0699 code in a GMC Sierra?
Symptoms may include a check engine light, erratic engine performance, poor fuel efficiency, or sensor-related issues.
3. What causes the P0699 code to appear on a 2018 GMC Sierra?
Common causes include a short to voltage in the wiring, a faulty sensor using the 5V reference circuit, or a defective Engine Control Module (ECM).
4. Can a P0699 code cause drivability issues?
Yes, this code can cause drivability problems such as rough idle, stalling, or inconsistent throttle response due to disrupted sensor operation.
5. How can I diagnose a P0699 code on my GMC Sierra?
Start by inspecting the 5V reference circuit wiring for damage, test the sensors connected to the circuit, and check the ECM for proper operation.
6. Which sensors use the 5V Reference 3 Circuit on a 2018 GMC Sierra?
Common sensors include the manifold absolute pressure (MAP) sensor, throttle position sensor (TPS), and other engine management sensors.
7. Is it safe to drive with a P0699 code on my GMC Sierra?
Driving may be possible but is not recommended, as the code indicates a problem that can lead to further engine performance issues or damage.
8. How do I fix a P0699 code on a 2018 GMC Sierra?
Repairs may include replacing damaged wiring, fixing shorts or open circuits, replacing faulty sensors, or reprogramming or replacing the ECM if necessary.
9. Can a blown fuse cause the P0699 code to appear?
Yes, a blown fuse in the 5V reference circuit can disrupt power delivery and trigger the code.
10. How much does it typically cost to repair a P0699 code issue?
The repair cost varies depending on the issue but can range from $50 for simple wiring repairs to $500 or more if the ECM or multiple sensors need replacement.
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