Regen Abort — Temperature Rise Rate Too Low
Temperature-rise-rate aborts require simultaneous monitoring of HC dosing and the DOC-to-DPF temperature chain before component replacement.
Fault Overview
Specific regen abort triggered when DOC or DPF temperature does not rise at the calibrated rate after hydrocarbon dosing begins. Indicates failure of light-off or heat transfer to the DPF. Temperature-rise aborts are among the most common regen failures.
Engine & Platform Coverage
Symptoms
- •Regen abort temperature rise
- •Temp rise rate low
- •DOC light-off fail
- •DPF temp rise abort
- •Regen failed heat
Possible Causes
- 1.Insufficient HC dosing
- 2.DOC face-plugging or damage
- 3.Exhaust leak before or at the DOC
- 4.Failed DOC inlet/outlet temperature sensors
- 5.Low exhaust flow
- 6.Incorrect dosing quantity
- 7.Oxygen starvation from high EGR or boost issues
- 8.Fuel quality problems
Wiring & Circuit Notes
Verify DOC and DPF temperature sensor circuits. Faulty sensors can report low rise rates that are not real or can fail to detect actual rise.
DVOM Specs & Sensor Tests
DOC inlet and outlet temperature traces during the first minutes of dosing. DPF inlet temperature response. HC dosing command. Differential pressure trend. Sensor resistance vs temperature chart if values appear irrational.
Diagnostic Flow — FSM Sequence
AI Diesel Tech enforces this evidence-gate sequence. Each gate must pass before advancing.
6 steps locked behind Technician Mode- 1Step 1 — Capture the Abort Reason and Freeze-Frame Temperatures: Capture the abort reason and freeze-frame temperatures. Temperature-rise aborts are among the most common regen failures.
- 2Step 2 — Force a Regen While Graphing DOC and DPF Temperatures with HC Command: Force a regen while graphing DOC inlet, DOC outlet, and DPF inlet temperatures together with HC command. This is the definitive test.
- 3Step 3 — Confirm Temperature Sensors Are Rational: Confirm temperature sensors are rational by correlation and resistance checks. Faulty sensors can report low rise rates that are not real.
- 4Step 4 — Verify HC Dosing Circuit and Quantity: Verify HC dosing circuit and quantity. Confirm the doser is receiving command and delivering fuel.
- 5Step 5 — Inspect for Exhaust Leaks Upstream of the DOC: Inspect for exhaust leaks upstream of the DOC. Leaks in this location directly prevent successful regeneration.
- 6Step 6 — Evaluate DOC Face Condition if Light-Off is Absent: Evaluate DOC face condition if light-off is absent despite confirmed dosing and no leaks.
- 7Step 7 — Correct the Failed Element and Confirm a Complete Regen: Correct the failed element and confirm a complete regen with proper temperature rise before releasing the vehicle.
Unlock the full evidence-gated diagnostic sequence, DVOM test steps, and repair procedures in Technician Mode.
Full Diagnostic Access
Verification steps, preventative measures, severity guidance, and legacy comparison are available in Technician Mode.
Typical Repair Costs
HC doser service $200–600; DOC cleaning or replacement $300–2,500; exhaust leak repair $100–400; temperature sensor replacement $120–400; address flow or oxygen issues variable.
Start Diagnosing This Fault Now
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Summary
Use the AI Diesel Tech diagnostic engine to run this code through a structured, evidence-gated sequence and get a confirmed root cause before any parts are replaced.