Fuel Pump B Control Circuit Open
The P2632 code means the vehicle's onboard diagnostic system has detected: Fuel Pump B Control Circuit Open. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $300 - $900 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Engine no-start or stalling
- Loss of fuel pressure
- Fuel pump B not running
- Check engine light on
Probable Causes (Ranked by Likelihood)
- Failed secondary fuel pump motor Very High
- Open wiring to fuel pump B High
- Blown fuel pump B fuse or relay Moderate
- ECM pump B driver failure Low
Step-by-Step Diagnostic Procedure
-
Check fuel pump B fuse and relay
-
Test pump B motor with direct power
-
Inspect wiring between ECM and pump B
-
Verify ECM commands pump B operation
Frequently Asked Questions
Why does my vehicle have two fuel pumps?
Many high-performance and direct injection vehicles use a low-pressure supply pump (pump B) to feed a high-pressure injection pump. Both must work for proper operation.
Can I drive if only pump B fails?
No. Pump B typically supplies fuel to the high-pressure pump. Without it, the high-pressure pump runs dry, causing no-start and potential pump damage.
Where is fuel pump B located?
Pump B is usually the in-tank low-pressure supply pump. It is accessed through a panel under the rear seat or by dropping the fuel tank.
Sources
This page is built from documented references. Verify against your own service info before repair work.
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.