Imagine driving down the highway, only to realize that your speedometer is showing an incorrect speed and your ABS light is suddenly flashing. This alarming scenario is not just a mere inconvenience but a potential hazard that can compromise your safety and your vehicle’s performance.
So what to do when speedometer not working and abs light on?
As the speedometer and the ABS system play crucial roles in maintaining control and stability on the road, their malfunction can lead to disastrous consequences.
This informative article will delve into the symptoms and possible causes of a malfunctioning speedometer and a triggered ABS light, highlighting the importance of addressing these issues promptly and effectively.
My comprehensive guide will provide valuable insights into the potential causes of these malfunctions and practical solutions to remedy the situation.
Contents
What are the causes for the speedometer not working and abs light on?
There are several possible causes for the speedometer not working and the ABS light being on. Here, we will discuss these causes in detail using the provided subheadings:
Malfunctioning ABS Sensor
The ABS (Anti-lock Braking System) sensor monitors the wheel speed and sends this information to the ABS control module. If this sensor malfunctions, it can cause the ABS light to turn on and the speedometer to stop working.
Faulty speed sensor
The speed sensor sends information about the vehicle’s speed to the instrument cluster. If this sensor is faulty, it can cause the speedometer to stop working and trigger the ABS light.
Low brake fluid level
Low brake fluid levels can cause the ABS light to turn on, as the system relies on adequate pressure to function properly. While this may not directly affect the speedometer, it is essential to address this issue to ensure the proper functioning of the braking system.
Damaged wiring or electrical connections
If there is damage to the wiring or electrical connections related to the ABS system or speedometer, it can cause both of these components to malfunction. This may include frayed wires, loose connections, or corrosion.
Defective ABS module or control unit
The ABS module or control unit is responsible for processing the information from the wheel speed sensors and controlling the ABS system. If this module is defective, it can cause the ABS light to turn on and the speedometer to stop working.
Worn or damaged wheel bearings
Worn or damaged wheel bearings can cause inaccurate wheel speed readings, which can trigger the ABS light and cause the speedometer to malfunction.
Faulty instrument cluster
The instrument cluster is responsible for displaying the speedometer and other vehicle information. If the instrument cluster is faulty, it can cause the speedometer to stop working and may also trigger the ABS light.
Malfunctioning vehicle speed sensor (VSS)
The vehicle speed sensor (VSS) sends speed information to the engine control module (ECM) and other vehicle systems. If the VSS is malfunctioning, it can cause the speedometer to stop working and trigger the ABS light.
Blown fuses
Blown fuses related to the ABS system or speedometer can cause these components to stop working. It is essential to check the relevant fuses and replace them if necessary.
Damaged tone ring or reluctor ring
The tone ring or reluctor ring is a component of the wheel speed sensor system, which generates a signal as the wheel rotates. If this ring is damaged, it can cause inaccurate wheel speed readings, triggering the ABS light and causing the speedometer to malfunction.
Speedometer not working and abs light on- How to fix it?
Comprehensive Guide: Fixing Common Causes of Speedometer Not Working and ABS Light On
Troubleshooting
To diagnose each issue that can cause the speedometer not to work and the ABS light to turn on, follow these steps:
Malfunctioning ABS Sensor
- Locate the ABS sensors on each wheel hub.
- Inspect the sensors for visible damage or debris.
- Use a multimeter to test the resistance of each sensor. Compare the readings to the manufacturer’s specifications.
- If the resistance is out of range, the sensor may be malfunctioning.
Faulty Speed Sensor
- Locate the speed sensor, typically mounted on the transmission.
- Inspect the sensor for visible damage or debris.
- Disconnect the sensor and use a multimeter to test its resistance. Compare the readings to the manufacturer’s specifications.
- If the resistance is out of range, the sensor may be faulty.
Low Brake Fluid Level
- Locate the brake fluid reservoir in the engine compartment.
- Check the fluid level and compare it to the minimum and maximum markings on the reservoir.
- If the fluid level is below the minimum, top it off with the recommended brake fluid.
Damaged Wiring or Electrical Connections
- Inspect the wiring and connectors of the ABS and speedometer for visible damage, corrosion, or loose connections.
- Use a multimeter to test for continuity and resistance in the wiring.
- Repair or replace any damaged wiring or connectors as needed.
Defective ABS Module or Control Unit
- Locate the ABS control module in the engine compartment or under the dashboard.
- Check for any diagnostic trouble codes (DTCs) related to the ABS using an OBD-II scanner.
- If DTCs indicate a problem with the ABS module or control unit, consider replacing it.
Worn or Damaged Wheel Bearings
- Raise the vehicle and secure it on jack stands.
- Grasp each wheel and attempt to move it back and forth. Excessive play can indicate worn or damaged wheel bearings.
- Remove the wheel and inspect the bearing for damage or wear if necessary. Replace as needed.
Faulty Instrument Cluster
- Inspect the instrument cluster for any visible damage or malfunctioning gauges.
- Check for any DTCs related to the instrument cluster using an OBD-II scanner.
- If necessary, consider replacing the instrument cluster.
Malfunctioning Vehicle Speed Sensor (VSS)
- Locate the VSS, which is typically mounted on the transmission or within the instrument cluster.
- Inspect the sensor for visible damage or debris.
- Disconnect the sensor and use a multimeter to test its resistance. Compare the readings to the manufacturer’s specifications.
- If the resistance is out of range, the VSS may be malfunctioning.
Blown Fuses
- Locate the fuse box and identify the fuses related to the ABS and speedometer.
- Remove each fuse and visually inspect it for damage.
- Use a multimeter to test for continuity in each fuse.
- Replace any blown fuses as needed.
Damaged Tone Ring or Reluctor Ring
- Raise the vehicle and secure it on jack stands.
- Remove the wheel and brake components to access the tone or reluctor ring.
- Inspect the ring for visible damage or missing teeth.
- If necessary, replace the damaged tone ring or reluctor ring.
Fixing the problems
Below are detailed instructions for fixing each issue, including the necessary tools and parts.
Malfunctioning ABS sensor
- Locate the ABS sensor on the wheel hub assembly.
- Disconnect the electrical connector.
- Remove the mounting bolt and gently pull out the sensor.
- Clean the sensor mounting area.
- Install the new ABS sensor and reconnect the electrical connector.
- Secure the sensor with the mounting bolt.
Tools and parts needed
- New ABS sensor
- Socket wrench
- Cleaning supplies
Faulty speed sensor
- Locate the speed sensor on the transmission.
- Disconnect the electrical connector.
- Remove the mounting bolt and gently pull out the sensor.
- Install the new speed sensor and reconnect the electrical connector.
- Secure the sensor with the mounting bolt.
- Tools and parts needed:
- New speed sensor
- Socket wrench
Low brake fluid level
- Locate the brake fluid reservoir in the engine bay.
- If necessary, check the fluid level and top up with the appropriate brake fluid.
- Inspect for leaks and repair if needed.
- Tools and parts needed:
- Brake fluid
- Funnel
Damaged wiring or electrical connections
- Inspect the wiring and connections related to the ABS and speed sensors.
- Repair or replace any damaged wires or connectors.
- Tools and parts needed:
- Wire strippers
- Electrical tape or heat shrink tubing
- Wire connectors (if necessary)
Defective ABS module or control unit
- Locate the ABS control module.
- Disconnect the electrical connectors and remove the mounting bolts.
- Install the new ABS module and reconnect the electrical connectors.
- Secure the module with the mounting bolts.
- Tools and parts needed:
- New ABS module
- Socket wrench
Worn or damaged wheel bearings
- Jack up the vehicle and remove the wheel.
- Remove the brake caliper and rotor.
- Remove the wheel hub assembly.
- Replace the wheel bearing and reassemble the wheel hub assembly.
- Reinstall the brake rotor and caliper.
- Reinstall the wheel and lower the vehicle.
- Tools and parts needed:
- New wheel bearing
- Jack and jack stands
- Socket wrench
- Brake caliper tool
Faulty instrument cluster
- Remove the instrument cluster from the dashboard.
- Disconnect the electrical connectors.
- Install the new instrument cluster and reconnect the electrical connectors.
- Reinstall the instrument cluster in the dashboard.
- Tools and parts needed:
- New instrument cluster
- Screwdriver or trim removal tool
Malfunctioning vehicle speed sensor (VSS)
- Locate the VSS on the transmission or differential.
- Disconnect the electrical connector.
- Remove the mounting bolt and gently pull out the sensor.
- Install the new VSS and reconnect the electrical connector.
- Secure the sensor with the mounting bolt.
- Tools and parts needed:
- New vehicle speed sensor
- Socket wrench
Blown fuses
- Locate the fuse box and identify the ABS or speed sensor-related fuses.
- Remove the blown fuse and replace it with a new one of the same amperage.
- Tools and parts needed:
- Replacement fuse(s)
- Fuse puller or needle-nose pliers
Damaged tone ring or reluctor ring
- Jack up the vehicle and remove the wheel.
- Remove the brake caliper and rotor.
- Inspect the tone ring or reluctor ring for damage.
- If damaged, replace the ring or the entire wheel hub assembly, depending on the design.
- Reinstall the brake rotor and caliper.
- Reinstall the wheel and lower the vehicle.
- Tools and parts needed:
- New tone ring or reluctor ring (or wheel hub assembly)
- Jack and jack stands
- Socket wrench
- Brake caliper tool
Frequently Asked Questions (FAQs)
Can ABS speed sensor affect speedometer?
Answer: No, the ABS speed sensor does not typically affect the speedometer. The speedometer usually relies on the vehicle speed sensor (VSS) to measure vehicle speed.
Will bad speed sensor cause ABS light?
Answer: Yes, a bad speed sensor can cause the ABS light to come on, as it may disrupt the communication between the ABS and the wheel speed information.
What causes a speedometer to stop working?
Answer: The most common causes for a speedometer to stop working are a faulty vehicle speed sensor (VSS), damaged wiring, a malfunctioning instrument cluster, or blown fuses.
Can you drive with a broken ABS speed sensor?
Answer: While it is possible to drive with a broken ABS speed sensor, it is not recommended, as it can compromise the vehicle’s ABS system, leading to reduced braking performance and safety.
Conclusion:
In conclusion, a non-functioning speedometer and an illuminated ABS light can be caused by various issues, such as faulty sensors, damaged wiring, or a malfunctioning instrument cluster.
It’s important to address these problems promptly to ensure your vehicle’s safety and proper functioning. Following the provided troubleshooting and repair steps, you can effectively diagnose and fix the issues, maintaining optimal vehicle performance and safety on the road.
