B3551 Engine Trouble Code
What is B3551?
B3551 indicates potential catalytic converter failure. If completely failed, your vehicle may not run properly and fuel economy will suffer significantly. Average replacement cost is $2,000–$2,140. This repair requires professional service and should not be delayed.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Code: | B3551 |
B3551 Symptoms
Check Engine Light
Illuminated dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration
Starting Problems
Difficulty starting the engine
B3551 Code Structure
Understanding what each digit means in the B3551 body trouble code:
| B | 3 | 5 | 5 | 1 |
|---|---|---|---|---|
| Body Code | Ignition System Or Misfire | Fuel Composition Sensor Circuit Malfunction | Cylinder 1 Injector Circuit Low | Crankshaft Position Sensor A Circuit Low Input |
How to Fix B3551
Diagnostic Steps:
The catalytic converter has oxygen sensors before and after it. When warm and in closed-loop mode, the upstream O2 sensor reading should fluctuate, while downstream should remain steady.
Repair Solution:
Verify all electrical connections are clean and tight. Check for damaged wiring, especially in high-heat or high-vibration areas. Use manufacturer wiring diagrams for accurate diagnosis.
Technical Notes:
B3551 on electronically controlled automatic transmissions relates to shift solenoid operation. The solenoid actuates hydraulic circuits controlling clutches or bands for gear changes.
B3551 Description
B3551 engine trouble code is related to Crankshaft Position Sensor A Circuit Low Input.
Main Cause
The primary reason for B3551 OBD-II Engine Trouble Code is: Fuel Composition Sensor Circuit Malfunction.