P2AD7

Reductant Pump Control Circuit High Bank 1

P2AD7 is a generic OBD-II powertrain diagnostic trouble code: Reductant Pump Control Circuit High Bank 1. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P2AD7
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on, possible limp mode)
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What P2AD7 means

P2AD7 is set when the aftertreatment or engine control module detects that the control circuit voltage for the reductant (DEF/AdBlue) supply pump on Bank 1 is higher than expected. The reductant pump draws solution from the tank and pressurizes it for delivery to the dosing injector. The module commands pump speed or duty cycle via a control signal and monitors the feedback circuit for correct electrical behavior.

A high voltage condition on the pump control circuit typically indicates a short to voltage (battery or ignition supply) somewhere in the wiring between the module and the pump, or an internal fault within the pump motor driver. It can also be caused by a wiring harness chafed against a power supply line or a failed pump assembly with an internal short to the pump housing voltage supply. The module detects this because the measured circuit voltage exceeds the commanded or expected range.

When this fault is present, the module may disable the pump to protect the driver circuit, stopping all reductant delivery. Without reductant supply, the SCR system cannot function and NOx emissions will be elevated. Depending on the manufacturer's compliance strategy, a dosing shutdown can trigger a torque reduction warning after the compliance timer expires. Prompt diagnosis is required to restore proper SCR operation.

Common causes

Most-frequently reported root causes when P2AD7 is logged.

  • 1
    Short to voltage in the pump motor control circuit wiring.
  • 2
    Chafed wiring harness contacting a battery or ignition power supply wire.
  • 3
    Failed reductant pump with internal short to supply voltage.
  • 4
    Corroded or contaminated pump harness connector causing leakage current.
  • 5
    Damaged aftertreatment control module output driver shorted high.
  • 6
    Incorrect wiring repair creating unintended connection to power.

Symptoms drivers notice

MIL and DEF/AdBlue warning indicator illuminated.
Reductant pump may be disabled, stopping DEF supply.
No reductant dosing, resulting in increased NOx emissions.
Possible torque reduction if compliance timer expires.
Scan tool may show pump command active but no flow or pressure.

How to diagnose P2AD7

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all stored DTCs and document freeze-frame conditions.
  2. 2
    With the ignition off, disconnect the reductant pump harness connector and measure voltage on the control circuit wire relative to ground; any significant voltage indicates a short to power.
  3. 3
    Inspect the harness routing from the control module to the pump for signs of chafing, melting, or contact with power supply conductors.
  4. 4
    Check pump connector pins for corrosion or moisture ingress.
  5. 5
    Test the pump motor resistance and insulation to confirm the pump itself is not internally shorted.
  6. 6
    If harness and pump are sound, suspect the control module driver and consult manufacturer procedures before replacing.
  7. 7
    Repair the short or replace the defective component, clear codes, and verify pump operation with a scan tool.

Related powertrain codes

Frequently asked questions

What is the difference between a circuit high and a circuit open fault on the pump?

A circuit high fault (like P2AD7) means the measured voltage is above the expected range, usually indicating a short to a power source. A circuit open fault means no signal is detected at all.

Can P2AD7 damage the control module?

Sustained short-to-voltage conditions can stress or damage module driver outputs. Diagnose and repair promptly to protect the module.

Will clearing the code fix the problem?

No. Clearing codes without repairing the underlying short to voltage will result in immediate re-setting of the fault.

Can moisture in the DEF tank cause this code?

Moisture contamination causes different faults related to concentration or flow. P2AD7 is an electrical circuit fault, not a fluid quality fault.

Disabling P2AD7 in software

RaceTune can permanently disable P2AD7 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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