P2634 on Chevrolet
Fuel Pump "B" Control Circuit High
P2634 on Chevrolet vehicles indicates fuel pump "b" control circuit high. Au7o has documented this code across 1 Chevrolet model — most commonly on Corvette. 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.
Common Causes of P2634
- •Short to voltage in the fuel pump 'B' circuit
- •Open circuit floating high
- •Faulty fuel pump or relay
- •Wiring/connector damage
- •PCM driver fault
P2634 on Chevrolet by Model
Chevrolet Corvette(1 issue)
- ZR1 LT7 Incidental DTCs P2632 and P2634 Found During a Scan2025
GM released Bulletin #25-NA-284, 'Information on DTCs P2632 and/or P2634 Found During a GDS 2 Scan for Another Concern,' with fitment limited to 2025 model year Corvettes equipped with the 5.5L twin-turbo LT7 - the ZR1. The bulletin's framing matters: these codes turn up as stored history codes while a technician is scanning for an unrelated complaint, which is exactly the situation where an aftermarket shop tends to sell an unnecessary repair. This is a diagnostic-information bulletin for the LT7 fuel/pump control DTC block, not a repair authorization.
Looking for P2634 on a different make?
View P2634 across all makes →Frequently Asked Questions
What does P2634 mean on Chevrolet?▼
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. On Chevrolet specifically, this code is documented across 1 model.
What causes P2634 on Chevrolet vehicles?▼
Common causes on Chevrolet: Short to voltage in the fuel pump 'B' circuit, Open circuit floating high, Faulty fuel pump or relay, Wiring/connector damage, PCM driver fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2634 on a Chevrolet?▼
Repair costs vary widely depending on the root cause and specific Chevrolet model.
Which Chevrolet models have P2634 documented?▼
Au7o has documented P2634 on 1 Chevrolet model: Corvette.