P202F

Code

Generic P — Powertrain

Reductant/Regeneration Supply Control Circuit Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 23 EN: 27 RU: 28

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Page language: EN

Use a scan tool to read freeze frame and live data for reductant dosing status and commanded duty
Visually inspect wiring and connectors at the reductant dosing valve, pump/solenoid and control module for damage, corrosion, or water ingress
Check DEF/urea level and quality (crystals, contamination) and inspect lines/filters for restriction
Verify fuses and relays for the reductant supply/heater circuits are good
Perform voltage and resistance checks at the injector/solenoid connector with connector disconnected and key on
Check ground integrity at the actuator and module using a multimeter

Circuit supply voltage: nominal battery voltage ~11–14 V with key on/engine running
Command signal: PWM or switched ground/positive from control module; duty cycle varies 0–100% depending on system
Actuator coil resistance (typical range): often ~5–40 ohms (refer to manufacturer spec) — open or very low resistance indicates fault
Expected control pin voltage when actuator not commanded: near supply voltage (if switched to ground when commanded) or near 0 V (if switched to supply) depending on circuit design
Ground continuity: near 0 ohms between actuator ground terminal and chassis ground

Retrieve freeze frame and live data with a scan tool. Note commanded duty, actual feedback, and related aftertreatment codes.
Perform visual inspection: connectors, wiring, harness routing, signs of chafing, corrosion, or rodent damage. Repair as necessary.
Check DEF/reductant level and quality; replace or drain if contaminated or crystallized. Inspect and replace inline filter if restricted.
With ignition on, measure supply voltage at the actuator power pin; verify ~11–14 V. Check relevant fuse(s) and relay operation.
With actuator disconnected, measure coil resistance across actuator pins. Compare to specification. Replace actuator if open or shorted.
Backprobe control/command pin while performing an active test (command dosing on/off) with a scan tool. Verify expected PWM or switched voltage and that the actuator responds.
Check ground circuit continuity from actuator ground to chassis/more remote ground point. Repair any high-resistance grounds.
Wiggle test harness and connectors while monitoring live data for intermittent faults. Repair breaks or poor contacts.
If wiring and actuator test good but no proper command or abnormal driver signals, test or swap the control module output (if possible) or consult OEM module test procedures.
After repairs, clear codes and perform verification test(s) including active dosing and confirm code does not return under normal operating conditions.