P200D: Particulate Filter Over Temperature (Bank 2)

What it means

The control module has detected particulate filter overtemperature on bank 2. The code does not establish that a runaway regeneration caused it.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The particulate filter on bank 2 captures soot from the exhaust, and regeneration raises its temperature to burn soot away. The module monitors bank 2 filter temperature and sets P200D when it detects a temperature above the permitted range. A restricted filter, regeneration or engine fault, or inaccurate temperature-sensor signal can cause the condition; the code alone does not identify which one.

Common causes

Most likely first.

1. Restricted or overloaded particulate filter
2. Excessive soot loading from an engine or regeneration fault
3. Faulty exhaust temperature sensor or wiring
4. Exhaust restriction or poor regeneration conditions

Symptoms

• Check engine light or DPF warning light on
• Power loss / limp mode
• Increased fuel consumption
• Failed forced regeneration attempts

How to diagnose it

1. Review freeze-frame and live bank 2 exhaust temperature data with DPF warning and regeneration status to see when the high temperature occurred and whether the reading is credible.
2. Inspect the bank 2 exhaust temperature sensor wiring and connector and the nearby exhaust for damage or overheating.
3. Check soot load and differential-pressure data, where available, to assess whether the bank 2 filter is restricted or overloaded.
4. Look for related engine and regeneration faults that could cause excess soot or fuel dosing before initiating any regeneration.
5. Test the bank 2 temperature sensor and circuit using the manufacturer's procedure, and address the cause before attempting regeneration.

Common fixes

• Repair damaged bank 2 exhaust temperature sensor wiring or connector.
• Replace a bank 2 temperature sensor confirmed faulty by testing.
• Fix engine or regeneration problems that are loading the filter with soot or excess fuel.
• Clean or replace the bank 2 particulate filter if tests confirm restriction or damage.

Can I keep driving?

If the DPF warning is accompanied by power loss or limp mode, avoid continued driving; stop safely if there is smoke, a burning smell, or signs of excessive exhaust heat. Continued operation can damage the filter and exhaust system, so have the bank 2 overtemperature cause checked promptly.