P2634 on 2025 Chevrolet Corvette (ZR1, ZR1 1LZ, ZR1 2LZ, ZR1 3LZ, ZR1 ZTK) — Fuel Pump "B" Control Circuit High
1 vehicles · 1 makes
Most Reported On
P2634 is an OBD-II diagnostic trouble code meaning “Fuel Pump "B" Control Circuit High.” The PCM detects a high-voltage condition (short to power or floating high) on the fuel pump 'B' control circuit, so the pump is not controlled correctly. This code is most commonly reported on 2025 Chevrolet Corvette (ZR1, ZR1 1LZ, ZR1 2LZ, ZR1 3LZ, ZR1 ZTK).
Common Causes
Diagnostic Tools
This is a powertrain code, so a basic OBD-II reader can read it. These read P2634.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple code reader for engine (P) codes on many compatible OBD-II vehicles. It does not support every vehicle or hybrid/EV application, and it does NOT read body, chassis or network codes; confirm exact-vehicle compatibility before buying.
- Read & clear engine (P) codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth scanner with a companion app that reads beyond the engine module — ABS, SRS and transmission — plus manufacturer-specific codes on many vehicles.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X V3.0 Elite OBD-II Scanner
by LAUNCH
Handheld scanner covering the four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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FAQ
What does P2634 mean?
P2634 stands for "Fuel Pump "B" Control Circuit High." The PCM detects a high-voltage condition (short to power or floating high) on the fuel pump 'B' control circuit, so the pump is not controlled correctly.
What are the most common causes of P2634?
The most common causes of P2634 are: Short to voltage in the fuel pump 'B' circuit, Open circuit floating high, Faulty fuel pump or relay, Wiring/connector damage, PCM driver fault. The specific cause varies by vehicle.
How much does it cost to fix P2634?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P2634?
Au7o has documented P2634 across 1 vehicle models from 1 manufacturers: Chevrolet.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.