P2551 Mercury Code - Torque Management Request Input Signal 'B' High
Quick Answer
To improve shift feel, the Transmission Control Module (TCM) may request that the Engine Control Module (ECM) reduce engine torque during shift events. Common causes include Faulty Engine Control Module (ECM), Faulty Transmission Control Module (TCM), Engine Control Module (ECM) software update. 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
- P2551 Mercury indicates Torque Management Request Input Signal 'B' High.
- Common causes
- Common causes include Faulty Engine Control Module (ECM), Faulty Transmission Control Module (TCM), Engine Control Module (ECM) software update.
- 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 P2551 Mercury Description
The torque reduction request is sent to the ECM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM.
A fault in the CAN will not cause the ECM to set the Diagnostic Trouble Codes (DTC). If a CAN fault occurs, other DTCs will set before this code.
The ECM set the OBDII code when the TCM receives a torque reduction failure message from the ECM.
What are the Possible Causes of the DTC P2551 Mercury?
- Faulty Engine Control Module (ECM)
- Faulty Transmission Control Module (TCM)
- Engine Control Module (ECM) software update
- Transmission Control Module (TCM) software update
- Engine Control Module (ECM) harness is open or shorted
- Engine Control Module (ECM) circuit poor electrical connection
How to Fix the DTC P2551 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 P2551 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 P2551 Mercury Code
1. What are the common symptoms of OBDII code P2551 in a Mercury vehicle?
- Common symptoms of P2551 include the engine light coming on, reduced engine power, and potential issues with the vehicle's torque management system.
2. What does the Torque Management Request Input Signal 'B' High mean in relation to OBDII code P2551?
- This code indicates that there is a high input signal detected in the torque management system, potentially causing performance issues in the vehicle.
3. What are the possible causes of OBDII code P2551 in a Mercury vehicle?
- Possible causes of P2551 include a faulty torque management sensor, wiring issues, a malfunctioning torque management module, or a problem with the engine control module.
4. How can I diagnose OBDII code P2551 in my Mercury vehicle?
- Diagnosing P2551 typically involves using a scan tool to retrieve the code, checking the torque management system components for faults, and testing the sensor and wiring for proper functionality.
5. Can I continue driving my Mercury vehicle with OBDII code P2551?
- It is not recommended to continue driving with P2551 present, as it can lead to reduced engine performance and potential safety issues. It's best to address the problem promptly.
6. How can I repair OBDII code P2551 in my Mercury vehicle?
- Repairing P2551 may involve replacing the faulty torque management sensor, repairing any damaged wiring, resetting the engine control module, or addressing any other underlying issues causing the high input signal.
7. Is it possible to clear OBDII code P2551 in a Mercury vehicle without fixing the underlying issue?
- While you can clear the code temporarily, it will likely return if the root cause is not addressed. It's crucial to fix the problem to prevent further issues.
8. Are there any DIY tips for troubleshooting OBDII code P2551 in a Mercury vehicle?
- DIY tips for troubleshooting P2551 include checking for loose or damaged wiring, inspecting the torque management sensor for visible damage, and ensuring all connections are secure.
9. How much does it typically cost to repair OBDII code P2551 in a Mercury vehicle?
- The cost of repairing P2551 can vary depending on the specific issue, parts needed, and labor costs. It's advisable to consult a mechanic for an accurate estimate.
10. Can a mechanic help me reset the OBDII code P2551 in my Mercury vehicle?
- Yes, a mechanic can diagnose the issue, make the necessary repairs, and reset the code using a scan tool to clear the fault code from the engine control module.
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