U2473 Code - Unexpected Vehicle Speed
Quick Answer
The primary source of vehicle location for the navigation system is the Audio Control Module (ACM) receiving the position signal through the Global Positioning System (GPS) antenna. Common causes include Vehicle Speed Signal, Faulty Audio Control Module (ACM), Audio Control Module (ACM) harness is open or shorted. 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
- U2473 indicates Unexpected Vehicle Speed.
- Common causes
- Common causes include Vehicle Speed Signal, Faulty Audio Control Module (ACM), Audio Control Module (ACM) harness is open or shorted.
- 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 U2473 Description
In addition, the ACM receives the wheel pulse signal from the Instrument Cluster (IC) (which gateways the signal from the Anti-Lock Brake System (ABS) module). This secondary signal is used to calculate vehicle position when the GPS signal is lost. It also supports the adaptive learning function of the ACM, whereby the ACM can compensate for long-term differences between the GPS signal location, and the actual distance traveled by the vehicle. The Diagnostic Trouble Code (DTC) will set when the calculated vehicle distance traveled based on the wheel pulse signal does not agree with the GPS antenna location.
What are the Possible Causes of the DTC U2473?
- Vehicle Speed Signal
- Faulty Audio Control Module (ACM)
- Audio Control Module (ACM) harness is open or shorted
- Audio Control Module (ACM) circuit poor electrical connection
How to Fix the DTC U2473?
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 U2473 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 U2473 code?
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Get the U2473 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- U2473 Ford — Unexpected Vehicle Speed
- U2473 Lincoln — Unexpected Vehicle Speed
- U2473 Mercury — Unexpected Vehicle Speed
Frequently Asked Questions about U2473 Code
1. What are the common symptoms of OBDII code U2473 (Unexpected Vehicle Speed)?
- Common symptoms include erratic speedometer readings, sudden acceleration or deceleration, and transmission shifting issues.
2. What could be causing OBDII code U2473 to trigger?
- Possible causes include a malfunctioning wheel speed sensor, wiring issues, a faulty ABS module, or a problem with the vehicle's transmission control module.
3. How can I diagnose the root cause of OBDII code U2473?
- Diagnosing the issue involves using a scan tool to retrieve the code, checking the wheel speed sensors for proper operation, inspecting the wiring for damage, and testing the ABS and transmission control modules.
4. Is it safe to continue driving with OBDII code U2473 present?
- It is not recommended to drive the vehicle with this code active, as it can lead to unpredictable vehicle behavior and potential safety hazards.
5. Can I reset OBDII code U2473 on my own?
- While you can clear the code using a scan tool, it is important to address the underlying issue causing the code to prevent it from recurring.
6. What are some repair tips for fixing OBDII code U2473?
- Repair tips may include replacing a faulty wheel speed sensor, repairing damaged wiring, recalibrating the ABS module, or reprogramming the transmission control module.
7. How much does it typically cost to repair OBDII code U2473?
- The cost of repairing this code can vary depending on the specific cause and the labor rates of the repair shop. It is recommended to get a diagnostic evaluation to determine the exact cost.
8. Will OBDII code U2473 cause my vehicle to fail an emissions test?
- The presence of this code may indicate underlying issues that can affect the vehicle's emissions system, potentially leading to a failed emissions test.
9. Can a DIY enthusiast fix OBDII code U2473 at home?
- Depending on the cause of the code, some DIY enthusiasts with the necessary tools and knowledge may be able to address the issue themselves, but more complex repairs may require professional assistance.
10. How can I prevent OBDII code U2473 from recurring in the future?
- Regular maintenance, such as checking and replacing wheel speed sensors as needed, inspecting wiring for damage, and addressing any ABS or transmission module issues promptly, can help prevent the code from recurring.
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