C0485 Engine Trouble Code
What is C0485?
C0485 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 Chassis (C) Trouble Code |
| System: | Chassis |
| Code: | C0485 |
C0485 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
C0485 Code Structure
Understanding what each digit means in the C0485 chassis trouble code:
| C | 0 | 4 | 8 | 5 |
|---|---|---|---|---|
| Chassis Code | Intake Valve Control Solenoid Circuit Low | O2 Sensor Heater Circuit Malfunction | Ignition/Distributor Engine Speed Input Circuit Malfunction | Crankshaft Position Sensor B Circuit Malfunction |
How to Fix C0485
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:
Firing order is engineered to minimise vibration. Altering firing order results in mistimed ignition and poor engine operation. Consult vehicle-specific repair manual for correct firing order.
Technical Notes:
C0485 on electronically controlled automatic transmissions relates to shift solenoid operation. The solenoid actuates hydraulic circuits controlling clutches or bands for gear changes.
C0485 Description
C0485 engine trouble code is related to Crankshaft Position Sensor B Circuit Malfunction.
Main Cause
The primary reason for C0485 OBD-II Engine Trouble Code is: O2 Sensor Heater Circuit Malfunction.