P2632Fuel Pump B Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Fuel pump B is a second pump beside the main one: a transfer pump between two tanks, an in-line booster or a second in-tank pump. P2632 reports an open in its control circuit. On the 6.6 L LML Duramax with dual tanks, GM's 2014 table 14OBDG10 drives the transfer pump relay through a low-side driver and sets the code as Type B after 3 s above 200 kOhm. In the 2020 diesel table 20OBDG04 it is a Type C code without MIL after 20 of 25 samples. Bulletin PIT5212B on 2013 Silverado/Sierra 3500 chassis cabs asks for a scan tool update before diagnosis. VW sets it below 0.8 mA for the in-line pump of 2014 Golf and Beetle; Ford's 2020-2023 summary uses P2632 for driver feedback faults of pump module B.
- What you may notice
- Fuel from the second tank is not transferred, gauge drops faster
- Possible stalling when the main tank runs dry
- Warning lamp depending on manufacturer
- Likely causes
- LikelyFailed transfer pump relay, fuse or relay socket
- PossibleOpen wire or corroded connector at the pump or tank
- PossiblePump motor or pump driver module open internally
- RareOutdated scan tool cannot command the pump (GM PIT5212B)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.