C1805 Mercury Code - Mismatched PCM and/or ABS Module
Quick Answer
When the ignition is turned to the RUN position, the Anti-Lock Brake System (ABS) Module and the Powertrain Control Module (PCM) share Vehicle Identification Number (VIN) information over the High Speed Controller Area Network (HS-CAN) bus. Common causes include Reprogram Powertrain Control Module (PCM) ("Flashing"), Faulty Anti-Lock Brake System (ABS) Module, Anti-Lock Brake System (ABS) Module 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
- C1805 Mercury indicates Mismatched PCM and/or ABS Module.
- Common causes
- Common causes include Reprogram Powertrain Control Module (PCM) ("Flashing"), Faulty Anti-Lock Brake System (ABS) Module, Anti-Lock Brake System (ABS) Module 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 C1805 Mercury Description
What are the Possible Causes of the DTC C1805 Mercury?
- Reprogram Powertrain Control Module (PCM) ("Flashing")
- 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
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC C1805 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1805 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.
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Frequently Asked Questions about C1805 Mercury Code
1. What are the common symptoms of OBDII code C1805 (Mismatched PCM and/or ABS Module) in a Mercury vehicle?
The common symptoms include the ABS warning light staying on, traction control issues, and potential difficulty in engaging the ABS system.
2. What could cause the OBDII code C1805 to appear in a Mercury vehicle?
The code C1805 typically appears when there is a mismatch between the powertrain control module (PCM) and the anti-lock braking system (ABS) module in the vehicle, often due to a communication error or module replacement.
3. How can I diagnose a mismatched PCM and ABS module in my Mercury?
Diagnosing a mismatched PCM and ABS module involves using an OBDII scanner to retrieve the specific code C1805, checking for any recent module replacements, and performing a thorough inspection of the communication between the modules.
4. Is it safe to continue driving my Mercury with the code C1805 present?
It is not recommended to drive the vehicle with the code C1805 present, as it may affect the functionality of the ABS system and compromise overall safety on the road.
5. Can I repair the mismatched PCM and ABS module issue in my Mercury myself?
Repairing the mismatched PCM and ABS module typically requires advanced diagnostic equipment and knowledge. It is advisable to seek help from a qualified mechanic or dealership to properly address the issue.
6. How much does it cost to fix the OBDII code C1805 in a Mercury vehicle?
The cost of fixing the code C1805 can vary depending on the root cause of the issue, parts needed for repair, and labor costs. It is recommended to obtain estimates from mechanics or dealerships for an accurate cost assessment.
7. Are there any preventive measures to avoid encountering the OBDII code C1805 in a Mercury?
Regular maintenance, avoiding unauthorized module replacements, and ensuring proper communication protocols between the PCM and ABS module can help prevent the occurrence of the code C1805 in a Mercury vehicle.
8. Can a software update resolve the mismatched PCM and ABS module issue in my Mercury?
In some cases, a software update provided by the manufacturer may address the mismatched PCM and ABS module concern. It is recommended to consult with a dealership or mechanic for guidance on software updates.
9. Will resetting the PCM or ABS module clear the code C1805 in my Mercury?
Resetting the PCM or ABS module may temporarily clear the code C1805, but if the root cause of the mismatch is not resolved, the code is likely to reappear. It is essential to diagnose and address the underlying issue for a permanent solution.
10. How long does it take to repair the mismatched PCM and ABS module issue in a Mercury vehicle?
The repair time for the mismatched PCM and ABS module issue can vary depending on the complexity of the problem and the availability of parts. It is advisable to consult with a mechanic for an estimated repair timeline.
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