Code Definition

P0629 — Fuel pump power (monitoring) circuit high - Circuit A

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0629

P0629 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0629 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0629 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0629 fault code is set when the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects a high voltage condition in the fuel pump power monitoring circuit, specifically in circuit A. This circuit is responsible for monitoring the voltage supplied to the fuel pump, ensuring it stays within the designated operational range. A high voltage condition in this monitoring circuit can indicate an overvoltage situation, potentially leading to excessive fuel pump speed or damage to the fuel pump and associated components.

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