U300E Code - ABS Module Ignition Input On
Quick Answer
The Anti-Lock Brake System (ABS) Module, hydraulic pump and solenoid valves require an operating voltage that is between 10 and 17 volts. Common causes include Faulty Anti-Lock Brake System (ABS) Module, Anti-Lock Brake System (ABS) Module harness is open or shorted, Anti-Lock Brake System (ABS) 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
- U300E indicates ABS Module Ignition Input On.
- Common causes
- Common causes include Faulty Anti-Lock Brake System (ABS) Module, Anti-Lock Brake System (ABS) Module harness is open or shorted, Anti-Lock Brake System (ABS) 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.
Code U300E Description
Internally to the ABS module, the ignition voltage supply circuit is used as a redundant back up for the battery voltage supply circuit in case the battery voltage supply circuit is interrupted. If the battery voltage supply circuit is interrupted, the ABS module immediately shuts off and does not enter the power latch mode. The module uses the power latch mode to write certain parameters (such as learned offsets numbers) to non-volatile memory. At the beginning of each ignition cycle, a counter value is increased by 1 after a specified vehicle speed has been reached and a specified time has elapsed. When the ABS module enters the power latch mode, this counter is reset to 0.
What are the Possible Causes of the DTC U300E?
- Faulty Anti-Lock Brake System (ABS) Module
- Anti-Lock Brake System (ABS) Module harness is open or shorted
- Anti-Lock Brake System (ABS) Module circuit poor electrical connection
How to Fix the DTC U300E?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U300E 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
- U300E Ford — ABS Module Ignition Input On
- U300E Lincoln — ABS Module Ignition Input On
- U300E Mercury — ABS Module Ignition Input On
Frequently Asked Questions about U300E Code
1. What does the OBDII code U300E mean?
U300E indicates a problem with the ABS module detecting an ignition input signal when it should not be present.
2. What are common symptoms of the U300E code?
Symptoms may include an illuminated ABS or traction control warning light, loss of ABS functionality, or erratic braking behavior.
3. What causes the U300E ABS Module Ignition Input On code?
Common causes include a faulty ignition switch, damaged wiring or connectors, a failing ABS module, or an electrical short in the ignition circuit.
4. Can I drive with the U300E code active?
Driving may still be possible, but ABS and traction control systems may not function correctly, leading to reduced braking performance and safety risks.
5. How is the U300E code diagnosed?
A technician will use a scan tool to confirm the code, inspect the ABS module wiring and connectors, and test the ignition circuit for shorts or faults.
6. How can I fix the U300E code?
Repairs may involve replacing damaged wiring, repairing faulty connectors, replacing the ignition switch, or reprogramming or replacing the ABS module.
7. Can a dead or weak battery cause the U300E code?
Yes, low voltage or electrical system issues can lead to erratic signals and trigger the U300E code.
8. Does clearing the U300E code with a scan tool fix the problem?
Clearing the code might turn off the warning temporarily, but the root cause must be repaired to prevent the code from returning.
9. How much does it cost to fix the U300E code?
Repair costs vary depending on the cause, ranging from $50 for simple wiring repairs to $1,000 or more if the ABS module needs replacement.
10. Can the U300E code be caused by aftermarket modifications?
Yes, improperly installed aftermarket electronics or modifications to the ignition or ABS system can cause this code.
Discuss the causes and fixes for U300E OBDII Code
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