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 getting a signal that's too high from one of its sensors, kind of like when a microphone is too loud and makes a screeching noise.
The Electronic Control Module (ECM) is detecting a higher than expected voltage from one of its sensor circuits.
P1571 indicates that the ECM has identified an abnormally high voltage output from the sensor supply circuit 'A'. This could be due to a short circuit, a faulty sensor, or issues with the ECM itself. The sensor supply circuit provides a reference voltage to various sensors, and when this voltage is too high, it can lead to incorrect sensor readings and affect engine performance.
• Check Engine Light is on
• Poor engine performance
• Erratic sensor readings
• Faulty sensor
• Short circuit in the wiring
• Defective ECM
ECM: Electronic Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Test the voltage output from the ECM to the sensor.
• Repair or replace damaged wiring.
• Replace the faulty sensor.
• Replace or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wiring diagram
$100 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect wiring for damage.
• Ensure sensors are properly maintained.
• Keep ECM software updated.
Sensor Issue
• Avoid driving the vehicle until repaired to prevent further damage.
• Consult a professional mechanic for diagnosis and repair.
Check your vehicle's warranty for coverage on ECM or sensor-related issues.
This code has been associated with sensor supply issues in various vehicle models, often related to wiring or sensor faults.
Moderate – It should be addressed soon to prevent potential engine performance issues.
Ignoring this code may lead to decreased vehicle performance and could affect emissions compliance.
• Engine running
• Sensors connected
The ECM is typically located in the engine compartment or under the dashboard.
Q: Can I drive with a P1571 code?
A: It's not recommended as it may lead to further engine issues.
Q: How can I reset the code?
A: You can reset the code using an OBD-II scanner, but it's important to fix the underlying issue first.
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.