P215D

Code

Generic P — Powertrain

Reductant Pump B Stuck On

Brand: Generic

Type: P — Powertrain

Views: UK: 22 EN: 29 RU: 21

AI status

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Page language: EN

Causes

Short or stuck output in the engine/control module
Relay or pump control driver stuck closed
Faulty pump motor with internal short or mechanical jam forcing motor on
Wiring short to battery or ground at the pump control circuit
Corroded/shorted connector or terminal at pump B
Faulty body/control module commanding the pump erroneously

Symptoms

Malfunction Indicator Lamp (MIL) or SCR/DEF warning illuminated
Reductant pump B runs continuously even when system commands it off
Rapid depletion of reductant (DEF/AdBlue) fluid
Possible inability to perform proper dosing/regeneration; reduced emission control performance
Stored DTC P215D and possibly related DEF system codes
Unusual pump noise or excessive heat at pump or wiring harness

What to check

Read and record stored codes, freeze frame and pending codes with scan tool
Check vehicle manufacturer service information and TSBs for known issues
Perform visual inspection of pump B, wiring, connectors, ground points and fuse/relay(s) for corrosion, damage or aftermarket splices
With ignition ON (engine off), observe pump behavior and listen for continuous operation
Using a scan tool, command pump B OFF and monitor pump state and control output
Check related fuses and relays for proper operation; swap relay with known good if applicable

Signal parameters

Connector voltage when pump commanded OFF: ~0 V (should not be battery voltage)
Connector voltage when pump commanded ON: ~Battery voltage (11–14.5 V) or PWM-modulated voltage per manufacturer spec
Control signal type: switched battery or PWM from ECM/module (check vehicle data)
When commanded OFF, current draw should be near zero; typical OFF current
When commanded ON, expected current draw depends on pump (commonly 1–5 A) — compare to spec
Resistance of pump motor coil (ohms) per service manual

Diagnostic algorithm

Connect a capable scan tool; read and record all codes, freeze frame, and live data for reductant pump B. Note ignition and engine status during freeze frame.
Review manufacturer service information and TSBs for P215D or pump B issues.
Visually inspect pump B, harness, connectors, grounds, fuses and relays for damage, corrosion or aftermarket modifications. Repair any obvious faults.
With ignition ON (engine OFF), command pump B OFF via scan tool. Listen/observe: if pump continues to run, proceed to electrical checks.
Check pump relay (if fitted): identify relay and swap with identical known-good relay or bench test. If relay is welded/closed replace relay and re-test.
Backprobe pump connector: measure voltage with pump commanded OFF. If battery voltage present, trace wiring for short to battery or stuck relay/driver. Repair wiring as required.

Likely causes

Wiring short to battery on pump B control circuit
Stuck closed relay or defective pump driver in control module
Failed pump motor with low internal resistance causing current draw when off
Corroded/shorted connector at pump assembly
Faulty ECM/powertrain control module output (less common)

Fault status

⚠️ Status

Control module detected pump B electrical supply or driver output active when commanded off. Code set when continuous pump-on condition persists or defined threshold of current/voltage is exceeded.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours