Error code

OBD2 P2002

OBD2P2002
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Particulate Trap Efficiency Below Threshold.

Severity

moderateCan drive, but performance may be affected and the issue should be addressed soon.

Summary

P2002 indicates that the diesel particulate filter (DPF) in bank 1 is not functioning efficiently enough to meet the threshold set by the engine control module (ECM). This code typically appears when the DPF has accumulated too much soot and needs a regeneration cycle.

Symptoms

  • Malfunction Indicator Light (MIL) illuminated
  • Poor fuel economy
  • Hard starting

Common Causes

  • Driver habit leading to insufficient highway driving for regen cycles
  • Overcharged DPF due to poor engine maintenance or high sulfur content fuels
  • Defective differential pressure sensor (DPS)
  • Outdated vehicle software

Diagnosis

  1. Clear DTC and see if it returns
  2. Perform a visual check for leaks or damage in exhaust system before DPS
  3. Check DPS connector and harness for issues
  4. Manually initiate DPF regeneration cycle using scan tool

Fixes

  • Replace defective differential pressure sensor (DPS)
  • Update vehicle software

FAQ

What can cause P2002 to appear?

Common causes include insufficient highway driving for regen cycles, overcharged DPF due to poor maintenance or fuel quality issues, and a defective DPS.

How do I prevent P2002 from recurring?

Regularly drive the vehicle on highways to ensure proper regeneration of the DPF. Maintain good engine condition and use appropriate fuels.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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