P2551 Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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 Chevrolet Code
1. What are the common symptoms of OBDII code P2551 on a Chevrolet?
- Common symptoms include reduced engine power, illuminated Check Engine Light, and potential transmission shifting issues.
2. What does the Torque Management Request Input Signal 'B' High mean in relation to code P2551?
- This code indicates that the signal from the torque management system to the engine control module is higher than expected.
3. What are the possible causes of OBDII code P2551 in a Chevrolet?
- Possible causes include a faulty torque management sensor, damaged wiring or connectors, issues with the torque management system itself, or a problem with the engine control module.
4. How can I diagnose the cause of OBDII code P2551 on my Chevrolet?
- Diagnosis typically involves using a scan tool to read the code, checking the torque management sensor and related components for damage, and testing the wiring for continuity.
5. Is it safe to continue driving with OBDII code P2551 present in a Chevrolet?
- It is not recommended to drive with this code present, as it can lead to reduced engine power and potential transmission issues, impacting the vehicle's drivability and safety.
6. Can I reset OBDII code P2551 on my Chevrolet to see if it returns?
- While you can reset the code, it is advisable to diagnose and address the underlying issue causing the code to prevent potential damage to the vehicle.
7. Are there any DIY repair tips for fixing OBDII code P2551 in a Chevrolet?
- DIY repair tips include checking and cleaning the torque management sensor connections, inspecting the wiring for damage, and ensuring all related components are securely in place.
8. How much does it typically cost to repair OBDII code P2551 on a Chevrolet?
- The cost of repair can vary depending on the exact cause of the code, but it may involve replacing the torque management sensor, repairing damaged wiring, or addressing issues with the torque management system.
9. Can a mechanic easily fix OBDII code P2551 on a Chevrolet?
- A qualified mechanic with experience in diagnosing and repairing engine control system issues should be able to efficiently address and repair OBDII code P2551 on a Chevrolet.
10. Is OBDII code P2551 a common issue in Chevrolet vehicles?
- While not extremely common, OBDII code P2551 can occur in Chevrolet vehicles, particularly in models equipped with torque management systems.
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