Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble getting the right information about how fast the car is going from the dashboard.
The P1577 code indicates an issue with the speed indication signal that is sent to the instrument pack, which is the part of the car that displays speed and other important information to the driver.
The P1577 code is triggered when the Engine Control Module (ECM) detects a malfunction in the speed indication signal from the instrument pack. This signal is crucial for various vehicle systems that rely on accurate speed data.
• Speedometer not working
• Erratic speed readings
• Check Engine Light illuminated
• Faulty speed sensor
• Wiring issues in the speed signal circuit
• Malfunctioning instrument cluster
ECM: Engine Control Module, the computer that controls engine functions.
Instrument Cluster: The panel on the dashboard that displays speed, fuel level, and other information.
• Verify the code with an OBD-II scanner.
• Inspect the speed sensor and related wiring.
• Check the instrument cluster for faults.
• Replace the faulty speed sensor.
• Repair or replace damaged wiring.
• Repair or replace the instrument cluster.
• OBD-II scanner
• Multimeter
• Screwdriver set
$100 - $500
Moderate
• Ford Focus
• Volkswagen Golf
• BMW 3 Series
• Regularly check the vehicle's wiring for damage.
• Ensure the speed sensor is clean and functioning.
• Perform routine maintenance on the instrument cluster.
Sensor Issue
• Do not ignore the Check Engine Light.
• Get the vehicle inspected by a professional if unsure.
• Avoid driving at high speeds until the issue is resolved.
Check with the vehicle manufacturer for warranty coverage on sensor and instrument cluster issues.
This code has been known to appear in vehicles with aging electrical systems, particularly those with high mileage.
Moderate – It is important to address this issue to ensure accurate speed readings and avoid further complications.
Driving with a malfunctioning speedometer can be unsafe and may lead to traffic violations.
• Vehicle at operating temperature
• On a flat, straight road
The speed sensor is typically located on the transmission, and the instrument cluster is located on the dashboard.
Q: Can I drive my car with the P1577 code?
A: While you can drive the car, it's not recommended as the speed readings may be inaccurate.
Q: Will the Check Engine Light turn off after the issue is fixed?
A: Yes, after the repair, the Check Engine Light should turn off if the issue is resolved.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.