What Does P200C Mean?
DTC P200C indicates the diesel particulate filter (DPF) on bank 1 has reached an over-temperature condition. The ECM monitors exhaust gas temperature sensors upstream and downstream of the DPF and sets this code when temperatures exceed safe thresholds, typically above 800-900 degrees Celsius. This can occur during forced regeneration events or due to excessive soot loading requiring aggressive regeneration.
Safety Warning
Significant safety concern. Extreme DPF temperatures can damage surrounding components, create fire risk near flammable materials, and may lead to thermal runaway. Avoid parking over dry grass or flammable surfaces. Prompt diagnosis is recommended.
Common Causes
30%
Excessive soot loading in the DPF triggering prolonged or aggressive regeneration
25%
Faulty diesel injector causing late injection or raw fuel entering the exhaust
20%
Malfunctioning exhaust gas temperature (EGT) sensor providing incorrect readings
15%
DPF substrate damage or partial melt from previous over-temperature event
10%
Failed DPF differential pressure sensor causing incorrect regeneration strategy
Diagnostic Steps
1
Read freeze frame data and review exhaust gas temperature PIDs for both upstream and downstream DPF sensors to confirm actual over-temperature versus sensor fault.
2
Check DPF soot loading level using scan tool; excessive soot load indicates regeneration issues or frequent short-trip driving.
3
Inspect the DPF differential pressure sensor and its hoses for blockage, leaks, or damage.
4
Perform a fuel injector balance test and check for injectors leaking excessive fuel into the exhaust stream.
5
If temperatures were genuinely extreme, inspect the DPF substrate through the downstream sensor port for signs of melting or collapse.
6
Verify the EGT sensors read accurately by comparing their values at ambient temperature (should match within a few degrees).
Estimated Repair Cost
$200 - $3,500
Parts + labor, varies by vehicle and location
DTC P200C indicates the diesel particulate filter (DPF) on bank 1 has reached an over-temperature condition. The ECM monitors exhaust gas temperature sensors upstream and downstream of the DPF and sets this code when temperatures exceed safe thresholds, typically above 800-900 degrees Celsius. This ...
The most common cause of P200C (Diesel Particulate Filter Over Temperature Bank 1) is: Excessive soot loading in the DPF triggering prolonged or aggressive regeneration
Typical repair costs for P200C range from $200 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Significant safety concern. Extreme DPF temperatures can damage surrounding components, create fire risk near flammable materials, and may lead to thermal runaway. Avoid parking over dry grass or flammable surfaces. Prompt diagnosis is recommended.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P200C to identify the root cause.
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Quick Info
Category
Powertrain
System
Exhaust / Emissions (Diesel Aftertreatment)
Difficulty
Type
Generic (SAE)
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