AutoCodes – Generic – C2521

C2521 Code - Vehicle Speed Is Abnormal

Quick Answer

Vehicle speed function codes were received from the transmitter, but the vehicle speed signal was not input to the module. Common causes include Faulty Tire Pressure Monitor System (TPMS) Control Module, TPMS Control Module harness is open or shorted, TPMS Control Module 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: C2521 indicates Vehicle Speed Is Abnormal.
Common causes: Common causes include Faulty Tire Pressure Monitor System (TPMS) Control Module, TPMS Control Module harness is open or shorted, TPMS Control Module 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 4,407

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C2521 Description

Vehicle speed function codes were received from the transmitter, but the vehicle speed signal was not input to the module. The Tire Pressure Monitor System (TPMS) Control Module monitors the vehicle speed. The TPMS Control Module sets the OBDII code when the vehicle speed signal is not to factory specifications.

OBDII Code C2521 - Vehicle Speed Is Abnormal - AutoCodes.com — C2521 Code - Vehicle Speed Is Abnormal

What does this mean?

What are the Possible Causes of the DTC C2521?

Faulty Tire Pressure Monitor System (TPMS) Control Module
TPMS Control Module harness is open or shorted
TPMS Control Module circuit poor electrical connection

How to Fix the DTC C2521?

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 C2521 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 C2521 code?

Need more information on how to fix the C2521 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C2521 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C2521 Subaru — Vehicle Speed Is Abnormal

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 C2521 Code

1. What are the common symptoms of OBDII code C2521 (Vehicle Speed Is Abnormal)?

- Common symptoms include erratic speedometer readings, vehicle speed fluctuations, and transmission shifting issues.

2. What are the possible causes of OBDII code C2521?

- Possible causes include a malfunctioning wheel speed sensor, damaged wiring or connectors in the speed sensor circuit, or issues with the vehicle's ABS system.

3. How can I diagnose the cause of OBDII code C2521?

- To diagnose the issue, you can use a diagnostic scan tool to check for specific trouble codes, visually inspect the speed sensor and its wiring, and perform a road test to observe the vehicle's speed behavior.

4. Can a faulty ABS system trigger OBDII code C2521?

- Yes, a malfunction in the ABS system, particularly related to the wheel speed sensors, can trigger OBDII code C2521 due to its impact on accurate speed measurements.

5. What are some repair tips for addressing OBDII code C2521?

- Repair tips may include replacing the faulty wheel speed sensor, repairing damaged wiring or connectors, ensuring proper ABS system functionality, and clearing the trouble code with a diagnostic tool.

6. Is it safe to drive with OBDII code C2521 active?

- It is not recommended to drive with OBDII code C2521 active, as inaccurate speed readings can affect the vehicle's performance and safety systems.

7. Can weather conditions affect the triggering of OBDII code C2521?

- Yes, extreme weather conditions such as heavy rain or snow can impact the speed sensor's performance and potentially trigger OBDII code C2521.

8. How can I prevent OBDII code C2521 from recurring?

- Regularly inspecting and maintaining the vehicle's speed sensor, wheel speed sensors, ABS system, and wiring can help prevent the recurrence of OBDII code C2521.

9. Will OBDII code C2521 cause a vehicle to fail an emissions test?

- OBDII code C2521 is related to vehicle speed and not emissions, so it may not directly cause a vehicle to fail an emissions test. However, it should still be addressed for overall vehicle performance.

10. How long does it typically take to repair OBDII code C2521?

- The repair time for OBDII code C2521 can vary depending on the exact cause of the issue, but it may take anywhere from a few hours to a full day for diagnosis and repair.