P1128 Lexus Code - Throttle Control Motor Lock Malfunction
Quick Answer
The throttle control motor is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve. Common causes include Faulty Throttle Control Motor, Throttle Control Motor harness is open or shorted, Throttle Control Motor circuit poor electrical connection. 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
- P1128 Lexus indicates Throttle Control Motor Lock Malfunction.
- Common causes
- Common causes include Faulty Throttle Control Motor, Throttle Control Motor harness is open or shorted, Throttle Control Motor circuit poor electrical connection.
- 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.
Code P1128 Lexus Description
The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feedback to the ECM to control the throttle control motor to make the throttle valve opening angle properly in response to driving condition.
What are the Possible Causes of the DTC P1128 Lexus?
- Faulty Throttle Control Motor
- Throttle Control Motor harness is open or shorted
- Throttle Control Motor circuit poor electrical connection
How to Fix the DTC P1128 Lexus?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1128 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1128 Lexus Code
What does the OBDII code P1128 mean for a Lexus?
P1128 indicates a "Throttle Control Motor Lock Malfunction," meaning the electronic throttle control system is not operating correctly.
What are the common symptoms of a P1128 code on a Lexus?
Symptoms include reduced engine power, poor acceleration, erratic idle, and possibly the check engine light turning on.
What causes the P1128 code to appear on a Lexus?
The code is typically caused by issues such as a malfunctioning throttle control motor, dirty or damaged throttle body, wiring problems, or a failing electronic control module (ECM).
Can I drive my Lexus with the P1128 code?
Driving with this code is not recommended, as it can lead to unsafe driving conditions due to reduced engine performance or throttle response.
How can I fix the P1128 code on my Lexus?
Repair options include cleaning or replacing the throttle body, inspecting and repairing wiring or connectors, and replacing the throttle control motor if necessary.
Is a throttle body cleaning enough to resolve the P1128 code?
In some cases, cleaning the throttle body may fix the issue, but if the throttle control motor is damaged, it will need to be replaced.
How much does it cost to repair a P1128 code on a Lexus?
Repair costs can vary, but throttle body cleaning might cost $100-$200, while throttle control motor replacement could range from $300 to $800 depending on labor and parts.
Can a software update resolve the P1128 code on a Lexus?
If the issue is related to ECM programming, a software update may help, but mechanical issues with the throttle system will require physical repairs.
How can I diagnose the P1128 code myself?
You can inspect the throttle body for dirt or damage, check wiring and connectors for corrosion or disconnection, and test the throttle control motor using a multimeter.
Will a faulty throttle control motor cause other problems in my Lexus?
Yes, it can lead to poor fuel efficiency, reduced engine performance, and potential damage to other components if not addressed promptly.
Discuss the causes and fixes for P1128 Lexus OBDII Code
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