P2634Fuel Pump B Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2634 indicates that the drive of the second fuel pump reads as shorted to battery voltage or carries too much current. For the 6.6 L LML with dual tanks, GM's 2014 table judges the transfer pump relay output while it is switched on and treats 0.5 ohm or less toward controller power, lasting 3 s, as a Type B fault. GM's 2020 diesel table checks the transfer pump driver while it is off instead and logs a Type C code after 20 of 25 samples; it notes that the open-circuit code P2632 may appear alongside. VW uses an overcurrent limit of 1.0 A for the in-line pump on 2014 Golf/GTI and Beetle. A pump with worn brushes or a shorted relay coil can cause it as well as damaged wiring. The open and low faults are P2632 and P2633.
- What you may notice
- Second pump runs constantly or is shut off by the module
- Fuel level display between tanks inconsistent
- Warning lamp depending on manufacturer
- Likely causes
- LikelyControl wire shorted to a battery-voltage feed
- PossibleWorn or binding pump drawing excess current
- RareRelay with shorted coil or stuck contacts
- 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.