AutoCodes – Ford – C1704 Ford

C1704 Ford Code - Parking Aid Right Rear Outer Sensor Fault

Quick Answer

The parking aid system detects objects behind the vehicle when the vehicle is in REVERSE. Common causes include Faulty Parking Aid Right Rear Outer Sensor, Parking Aid Right Rear Outer Sensor harness is open or shorted, Parking Aid Right Rear Outer Sensor 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: C1704 Ford indicates Parking Aid Right Rear Outer Sensor Fault.
Common causes: Common causes include Faulty Parking Aid Right Rear Outer Sensor, Parking Aid Right Rear Outer Sensor harness is open or shorted, Parking Aid Right Rear Outer Sensor 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 3,698

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 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
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Code C1704 Ford Description

The parking aid system detects objects behind the vehicle when the vehicle is in REVERSE. The parking aid module does this by calculating the distance to an object by the use of 4 ultrasonic sensors mounted in the rear bumper. The ultrasonic field is emitted in a semicircular area around the rear of the vehicle. The parking aid sensors can detect objects approximately 1.8 m (5.9 ft) to the rear of the vehicle, 46 cm (18 in) to the rear side of the vehicle, and 16 cm (6 in) above ground. A 750 Hz variable warning tone is generated from a parking aid speaker attached to the parking aid module. The parking aid speaker increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 25 cm (10 in) of the sensors, the warning tone becomes continuous.
The parking aid system is enabled when the ignition switch is in the RUN position and REVERSE is selected. The system can be disabled through the message center RESET switch located in the instrument cluster. The parking aid menu is displayed until the transmission is taken out of REVERSE. While the menu is displayed, pressing the message center RESET switch changes the parking aid system status to OFF.
The parking aid system is disabled if a fault is detected in 1 of the 4 sensors, the parking aid speaker, or the parking aid module. This will be indicated by the parking aid disabled warning CHECK BACKUP AID displayed in the message center. The parking aid module is on the International Standards Organization (ISO) 9141 network and can be diagnosed with a diagnostic tool.

OBDII Code C1704 Ford - Parking Aid Right Rear Outer Sensor Fault - AutoCodes.com — C1704 Ford Code - Parking Aid Right Rear Outer Sensor Fault

What does this mean?

What are the Possible Causes of the DTC C1704 Ford?

Faulty Parking Aid Right Rear Outer Sensor
Parking Aid Right Rear Outer Sensor harness is open or shorted
Parking Aid Right Rear Outer Sensor circuit poor electrical connection

How to Fix the DTC C1704 Ford?

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 C1704 Ford 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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Need Help with the Code?

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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 C1704 Ford Code

What does the OBDII code C1704 mean for a Ford vehicle?

C1704 indicates a fault in the right rear outer parking aid sensor, which may affect the vehicle's parking assistance system.

What are the common symptoms of a C1704 code?

Symptoms may include the parking aid system not functioning, beeping or warning lights when the vehicle is in reverse, or inconsistent sensor readings.

What could cause the C1704 code to trigger?

Possible causes include a faulty right rear outer sensor, damaged wiring or connectors, or issues with the parking aid control module.

How can I diagnose the C1704 code?

Use an OBDII scanner to confirm the code, then visually inspect the sensor, wiring, and connectors. Check for any related codes that may provide additional context.

Can I drive my Ford with a C1704 code?

While you can drive the vehicle, the parking aid system will not function correctly, which could make parking more challenging.

What is the cost of repairing the C1704 code?

Repair costs can vary widely depending on whether the sensor needs to be replaced, if wiring needs repair, or if further diagnostics are required. Expect costs to range from $100 to $500.

Is it safe to ignore the C1704 code?

Ignoring the C1704 code is not recommended, as it affects parking assistance, which can lead to accidents or damage while parking.

How can I reset the C1704 code after repairs?

You can reset the code using an OBDII scanner, or by disconnecting the vehicle's battery for a short period, although the latter may reset other system settings as well.

What should I do if the C1704 code keeps coming back after repairs?

If the code reappears, further diagnosis is necessary. Check for shorts in the wiring, ensure proper sensor installation, and verify that the control module is functioning correctly.