Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the part of the car that controls how much air goes into the engine. It's like when the remote control for your toy car isn't working right.
The engine control module (ECM) has detected a high voltage condition in the throttle valve enable line circuit for bank 2.
The P157E code indicates that the ECM has found an issue with the throttle valve enable line circuit, specifically that the voltage is higher than expected. This circuit is responsible for controlling the throttle valve, which regulates airflow into the engine. Bank 2 refers to the side of the engine that does not contain cylinder 1 in a V-type engine configuration.
• Check Engine Light is on
• Poor engine performance
• Reduced fuel efficiency
• Faulty throttle actuator control motor
• Wiring issues such as open or short circuits
• Defective ECM
Throttle Valve: A component that regulates the amount of air entering the engine.
ECM: Engine Control Module, the computer that controls engine functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the throttle actuator control motor for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the throttle actuator control motor if faulty.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Screwdriver set
$200 - $800
Moderate
• BMW 5 Series
• Audi A6
• Mercedes-Benz E-Class
• Regularly inspect and maintain the throttle system.
• Keep the engine control module updated.
• Ensure all electrical connections are secure.
Sensor Issue
• Avoid driving the vehicle until the issue is resolved.
• Consult a professional mechanic for diagnosis and repair.
Check with your vehicle manufacturer for warranty coverage on the throttle system.
This code has been associated with throttle control issues in vehicles with electronic throttle systems.
Moderate – It is recommended to address this issue soon to avoid potential engine performance problems.
Ignoring this code may lead to reduced vehicle performance and could affect emissions compliance.
• Engine at operating temperature
• Vehicle in park or neutral
The throttle valve is located near the intake manifold on the engine.
Q: Can I drive with a P157E code?
A: It's not recommended to drive with this code as it may lead to poor engine performance.
Q: How is the throttle valve related to engine performance?
A: The throttle valve controls the amount of air entering the engine, which is crucial for proper combustion and performance.
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.