U172A Code - Left High Beam Control Module Lost Communication With Left Headlamp Horizontal Motor
Quick Answer
The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Left Headlamp Horizontal Motor, Left Headlamp Horizontal Motor harness is open or shorted, Left Headlamp Horizontal 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
- U172A indicates Left High Beam Control Module Lost Communication With Left Headlamp Horizontal Motor.
- Common causes
- Common causes include Faulty Left Headlamp Horizontal Motor, Left Headlamp Horizontal Motor harness is open or shorted, Left Headlamp Horizontal 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 U172A Description
What are the Possible Causes of the DTC U172A?
- Faulty Left Headlamp Horizontal Motor
- Left Headlamp Horizontal Motor harness is open or shorted
- Left Headlamp Horizontal Motor circuit poor electrical connection
- Faulty Left High Beam Control Module
How to Fix the DTC U172A?
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 U172A 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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Information for Specific Makes
- U172A Buick — Left High Beam Control Module Lost Communication With Left Headlamp Horizontal Motor
- U172A Cadillac — Left High Beam Control Module Lost Communication With Left Headlamp Horizontal Motor
- U172A Chevrolet — Left High Beam Control Module Lost Communication With Left Headlamp Horizontal Motor
- U172A GMC — Left High Beam Control Module Lost Communication With Left Headlamp Horizontal Motor
Frequently Asked Questions about U172A Code
1. What are the common symptoms of OBDII code U172A?
The common symptoms of OBDII code U172A include the left high beam not working, the headlight not adjusting horizontally, and a warning light on the dashboard.
2. What can cause the OBDII code U172A to appear?
The OBDII code U172A typically appears when there is a communication loss between the left high beam control module and the left headlamp horizontal motor.
3. How serious is the OBDII code U172A?
The seriousness of OBDII code U172A depends on the driver's preference for high beam functionality and headlight adjustment. It is recommended to address this issue to maintain optimal visibility and safety during nighttime driving.
4. Can I still drive my vehicle with the OBDII code U172A present?
It is not recommended to drive the vehicle with the OBDII code U172A present, as it may compromise visibility and safety, especially during night driving or in low-light conditions.
5. What are some DIY repair tips for fixing OBDII code U172A?
Some DIY repair tips for fixing OBDII code U172A include checking the wiring connections between the control module and the headlamp motor, ensuring they are secure and free from damage. Resetting the system by disconnecting the battery for a few minutes may also help.
6. How can a mechanic diagnose and repair OBDII code U172A?
A mechanic can diagnose OBDII code U172A using a scan tool to communicate with the vehicle's onboard computer. They will inspect the wiring, connectors, and components related to the left high beam control module and left headlamp horizontal motor to identify and repair any faults.
7. Is it necessary to replace the left high beam control module when dealing with OBDII code U172A?
In some cases, replacing the left high beam control module may be necessary to resolve OBDII code U172A if it is determined to be faulty or damaged beyond repair. However, thorough diagnosis is recommended before replacing any components.
8. How much does it typically cost to repair OBDII code U172A at a repair shop?
The cost to repair OBDII code U172A at a repair shop can vary depending on the underlying issue, labor rates, and parts needed. It is advisable to obtain multiple quotes from reputable repair shops to compare prices.
9. Can OBDII code U172A be triggered by a loose connection or bad ground?
Yes, OBDII code U172A can be triggered by a loose connection or bad ground affecting the communication between the left high beam control module and the left headlamp horizontal motor. Checking and securing these connections is a good first step in troubleshooting.
10. Is it possible for the OBDII code U172A to reoccur after being reset or repaired?
Yes, it is possible for OBDII code U172A to reoccur if the root cause of the communication loss between the control module and headlamp motor is not adequately addressed during the reset or repair process. Regular maintenance and timely repairs can help prevent its recurrence.
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