P1720 Mazda Code - Vehicle Speed Sensor No Signal
Quick Answer
The P1720 code for Mazda vehicles indicates that the Vehicle Speed Sensor (VSS) is not sending a signal to the Engine Control Module (ECM). Common causes include Faulty Vehicle Speed Sensor, Damaged wiring or connectors leading to the VSS, Failed ECM. 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
- P1720 Mazda indicates Vehicle Speed Sensor No Signal.
- Common causes
- Common causes include Faulty Vehicle Speed Sensor, Damaged wiring or connectors leading to the VSS, Failed ECM.
- 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 P1720 Mazda Description
The P1720 code for Mazda vehicles indicates that the Vehicle Speed Sensor (VSS) is not sending a signal to the Engine Control Module (ECM). The VSS plays a crucial role in the vehicle's operation by providing information about the speed of the vehicle to the ECM, which uses this data for various functions such as shifting gears in an automatic transmission, fuel injection, and ABS operation. When the ECM does not receive a signal from the VSS, it can lead to a variety of performance issues and potential safety concerns.
Common Causes of P1720 Mazda
- Faulty Vehicle Speed Sensor
- Damaged wiring or connectors leading to the VSS
- Failed ECM
- Broken tone ring or gear that the VSS reads from
- Corrosion or contamination affecting the VSS signal
Symptoms of P1720 Mazda
- Harsh or erratic shifting in an automatic transmission
- Speedometer not working or fluctuating
- ABS or traction control warning lights illuminated on the dashboard
- Cruise control not engaging or disengaging unexpectedly
How to Fix P1720 Mazda
- Begin by locating the VSS on the transmission or differential and inspecting the wiring and connectors for any damage or corrosion. Repair or replace any damaged wiring.
- Test the VSS using a multimeter to check for proper resistance and signal output. Replace the VSS if it fails the test.
- Check the tone ring or gear that the VSS reads from for any damage or wear. Replace if necessary.
- Clear the diagnostic trouble codes from the ECM using an OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P1720 Mazda
The cost of repairing a P1720 code related to the Vehicle Speed Sensor can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost of replacing a faulty VSS can range from $100 to $250 including parts and labor. However, if additional components such as the ECM need to be replaced, the cost can increase significantly. It's recommended to contact local auto repair shops for a more accurate estimate based on your vehicle make and model.
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Frequently Asked Questions about P1720 Mazda Code
1. What does the OBDII code P1720 mean on a Mazda?
P1720 indicates that the vehicle's Engine Control Module (ECM) has detected no signal from the vehicle speed sensor (VSS), which measures the speed at which the vehicle is traveling.
2. What are the symptoms of a P1720 code on a Mazda?
Common symptoms include erratic or non-functional speedometer, poor transmission shifting, reduced fuel efficiency, illuminated check engine light, and possible limp mode activation.
3. What causes the P1720 code in a Mazda?
The most common causes include a faulty vehicle speed sensor, damaged wiring or connectors in the VSS circuit, a malfunctioning ECM, or issues with the sensor's mounting or alignment.
4. Can I drive my Mazda with a P1720 code?
Driving with a P1720 code is not recommended because it can affect transmission shifting, fuel efficiency, and overall vehicle performance. Immediate diagnosis and repair are advised.
5. How do I diagnose a P1720 code on a Mazda?
Start by inspecting the VSS and its wiring for damage or disconnections. Use a multimeter to check the sensor’s resistance and ensure proper voltage supply. A scan tool can also monitor VSS data to confirm if the sensor is functioning.
6. How do I fix a P1720 code on a Mazda?
Repairs may include replacing the faulty vehicle speed sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the ECM if necessary.
7. How much does it cost to repair a P1720 code on a Mazda?
The cost depends on the issue. Replacing a vehicle speed sensor typically costs $100–$300, including parts and labor. Wiring repairs or ECM replacements may cost more.
8. Can a bad speed sensor cause transmission problems?
Yes, a faulty speed sensor can cause transmission shifting issues, as the ECM relies on speed data to determine proper gear changes.
9. Will clearing the P1720 code fix the issue?
Clearing the code without addressing the underlying problem will not solve the issue. The code will likely return until proper diagnosis and repairs are performed.
10. How often do vehicle speed sensors fail in Mazdas?
Vehicle speed sensors are generally durable but can fail due to wear and tear, exposure to dirt or moisture, or electrical issues. Regular maintenance can help prevent premature failure.
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