AutoCodes – Generic – C1748

C1748 Code - Switch Input Circuit Short To Ground

Quick Answer

The parking aid system is enabled when the ignition switch is in the RUN position and the transmission is in REVERSE. Common causes include Faulty Parking Aid Switch, Parking Aid Switch harness is open or shorted, Parking Aid Switch 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: C1748 indicates Switch Input Circuit Short To Ground.
Common causes: Common causes include Faulty Parking Aid Switch, Parking Aid Switch harness is open or shorted, Parking Aid Switch 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.

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Code Popularity 5,443

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 19, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1748 Description

The parking aid system is enabled when the ignition switch is in the RUN position and the transmission is in REVERSE. The system can be disabled by the parking aid switch.

OBDII Code C1748 - Switch Input Circuit Short To Ground - AutoCodes.com — C1748 Code - Switch Input Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC C1748?

Faulty Parking Aid Switch
Parking Aid Switch harness is open or shorted
Parking Aid Switch circuit poor electrical connection
Faulty Parking Aid Module

How to Fix the DTC C1748?

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 C1748 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.

Need more information about the C1748 code?

Need more information on how to fix the C1748 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1748 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1748 Ford — Switch Input Circuit Short To Ground
C1748 Lincoln — Switch Input Circuit Short To Ground
C1748 Mercury — Switch Input Circuit Short To Ground

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1748 Code

1. What are the common symptoms of OBDII code C1748 (Switch Input Circuit Short To Ground)?

The common symptoms include issues with the vehicle's electronic stability control system, malfunction indicator light (MIL) illuminating, and potential loss of power steering assist.

2. What are some possible causes of OBDII code C1748?

Possible causes include a short to ground in the switch input circuit, damaged wiring or connectors, a faulty steering angle sensor, or a problem with the electronic stability control module.

3. How can I diagnose the Switch Input Circuit Short To Ground issue related to code C1748?

Diagnosis typically involves using a scan tool to read the fault code, inspecting the wiring and connectors for damage, checking the steering angle sensor's operation, and testing the electronic stability control module.

4. Can a DIY enthusiast repair OBDII code C1748 at home?

Repairing this issue may require advanced diagnostic equipment and expertise. It is recommended to have a professional mechanic diagnose and repair the problem to ensure proper resolution.

5. Is it safe to drive with OBDII code C1748 present?

It is not recommended to drive the vehicle with this fault code present, as it may affect the stability control system and potentially compromise vehicle safety.

6. How much does it typically cost to repair OBDII code C1748?

The cost of repairs can vary depending on the exact cause of the issue. It is best to consult a mechanic for a proper diagnosis and cost estimate.

7. Can a faulty steering angle sensor cause OBDII code C1748?

Yes, a faulty steering angle sensor can contribute to the Switch Input Circuit Short To Ground issue and trigger code C1748.

8. Will resetting the fault codes make OBDII code C1748 disappear?

Resetting the fault codes may temporarily clear the MIL, but the underlying issue causing code C1748 will persist until properly diagnosed and repaired.

9. How urgent is it to address OBDII code C1748?

It is important to address code C1748 promptly to ensure the proper functioning of the vehicle's stability control system and to maintain safe driving conditions.

10. Can extreme weather conditions trigger OBDII code C1748?

Extreme weather conditions may not directly trigger this fault code, but they can exacerbate existing issues such as damaged wiring or connectors, leading to the code being set.