U1900 Mercury Code - CAN Communication Bus Fault
Quick Answer
The Anti-ock Brakes System (ABS) module, the Powertrain Control Module (PCM), and the instrument cluster communicate over the Controller Area Network (CAN) Bus. Common causes include Faulty / intermittent ignition switch connections, CAN Bus wiring intermittently open/shorted to power or ground, Faulty / intermittent connection at PCM. 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
- U1900 Mercury indicates CAN Communication Bus Fault.
- Common causes
- Common causes include Faulty / intermittent ignition switch connections, CAN Bus wiring intermittently open/shorted to power or ground, Faulty / intermittent connection at PCM.
- 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 U1900 Mercury Description
What are the Possible Causes of the DTC U1900 Mercury?
- Faulty / intermittent ignition switch connections
- CAN Bus wiring intermittently open/shorted to power or ground
- Faulty / intermittent connection at PCM
- Faulty electrical connections at ABS Control Module
- Faulty electrical connections at the instrument cluster
- Poor connections at the trailer brake controller/trailer connector
How to Fix the DTC U1900 Mercury?
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
Someone hooks up a scanner to the OBDII port while the ignition is on or while the engine is idling.
A trailer brake system is installed improperly/incorrectly on a truck with ABS (anti-lock brakes).
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U1900 Mercury 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 U1900 Mercury code?
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Need Help with the Code?
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Frequently Asked Questions about U1900 Mercury Code
1. What are common symptoms of OBDII code U1900 in a Mercury related to CAN communication bus fault?
- Common symptoms include dashboard warning lights, loss of communication with vehicle modules, erratic behavior of electronic systems, and difficulty starting the vehicle.
2. What are some possible causes of OBDII code U1900 in a Mercury?
- Possible causes include damaged wiring or connectors in the CAN bus network, faulty Control Area Network (CAN) modules, water or corrosion damage, or software issues.
3. How can I diagnose the CAN communication bus fault causing code U1900 in my Mercury?
- To diagnose the issue, perform a visual inspection of wiring and connectors, use a diagnostic scanner to check for communication errors, and perform tests on individual modules within the CAN network.
4. What are the repair options for fixing OBDII code U1900 in a Mercury due to a CAN communication bus fault?
- Repair options may include repairing or replacing damaged wiring, connectors, or modules, resetting the network by disconnecting the battery, updating software, or seeking professional assistance for advanced diagnostics.
5. Can a DIY enthusiast fix the CAN communication bus fault causing code U1900 in a Mercury?
- Depending on the specific issue, some DIY enthusiasts may be able to address the problem by checking and repairing wiring connections. However, more complex issues may require professional diagnosis and repair.
6. Is it safe to continue driving with OBDII code U1900 related to a CAN communication bus fault in a Mercury?
- It is not recommended to continue driving with this issue as it can lead to further electrical problems or affect the overall performance and safety of the vehicle. It is best to address the problem promptly.
7. How can I prevent OBDII code U1900 from reoccurring in my Mercury after repairing the CAN communication bus fault?
- To prevent the code from reoccurring, regularly inspect the wiring and connectors in the CAN network, ensure proper maintenance of electronic components, and address any related issues promptly.
8. Are there any recalls or technical service bulletins related to OBDII code U1900 in Mercury vehicles?
- It is advisable to check with the manufacturer or authorized service centers for any recalls or technical service bulletins related to OBDII code U1900 and CAN communication bus faults in Mercury vehicles.
9. Can extreme weather conditions contribute to the occurrence of OBDII code U1900 in a Mercury due to CAN communication bus faults?
- Yes, extreme weather conditions such as heat, cold, or moisture can potentially affect the CAN bus network and lead to communication faults triggering code U1900 in a Mercury.
10. How long does it typically take to diagnose and repair OBDII code U1900 in a Mercury caused by a CAN communication bus fault?
- The time required for diagnosis and repair can vary depending on the complexity of the issue and the expertise of the technician. It may range from a few hours to a full day, or longer for more challenging cases.
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