P0232 on Subaru: How to Diagnose & Fix
Fuel Pump Secondary Circuit - High
1 Subaru model · 1 documented issue · 1 critical
P0232 on Subaru by model: symptoms, diagnosis and fix
Certain 2019-2020 Ascents are covered by low-pressure fuel pump recalls (Subaru WRD-20 / NHTSA 20V-218 for 2019 models, expanded by WRG-21 / NHTSA 21V-587 to 2019-2020 models). The pump impeller was made with a lower-density material that can absorb excessive fuel and deform until it interferes with the pump body. A deformed impeller reduces fuel delivery, causing engine stalling, rough running, or inability to start. This is a safety concern as stalling can occur without warning during driving. The recall was coordinated across multiple manufacturers using the same Denso fuel pump.
Common Symptoms
- Engine stalling without warning while driving
- Rough idle or engine misfires
- Extended cranking before engine starts
- Loss of power during acceleration
- Check engine light with fuel system codes
- Vehicle fails to start
How to Fix
Check recall status by VIN at subaru.com/owners/recalls or NHTSA.gov. Recalls WRD-20 (NHTSA 20V-218) and WRG-21 (NHTSA 21V-587) provide free low-pressure fuel pump replacement at any Subaru dealer. The updated pump uses a revised impeller material resistant to fuel component absorption. If you experience stalling before recall repair, avoid situations where a stall could be dangerous.
Sources for this issue (6)
- NHTSA Recall 20V-218 Part 573 Safety Recall Reportrecall
- NHTSA Recall 21V-587 Part 573 Safety Recall Reportrecall
- Fuel pump recall - Subaru Ascent Forumforum
- Subaru Denso Fuel Pump Lawsuit - Seeger Weissmedia
- Subaru Outback Ascent Impreza Legacy Recalled Defective Fuel Pump - Torque Newsmedia
- Subaru Recalls Nearly All Carlines Fuel Pump Failure - Torque Newsmedia
P0232 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0232 mean on a Subaru?
P0232 stands for "Fuel Pump Secondary Circuit - High." This code means the engine computer has detected a high voltage signal in the fuel pump secondary (control) circuit, indicating the circuit that drives or monitors the fuel pump relay is reading higher than it should. The computer controls fuel pump power delivery through a relay and/or driver module, and a high reading suggests a short to voltage, a stuck relay, or a wiring fault in that control circuit. Depending on the fault, it can cause hard starting, stalling, or a no-start because fuel delivery is disrupted. The problem is typically electrical, in the relay, driver, or wiring, rather than the pump motor itself. On Subaru it is documented across 1 model: Ascent.
What are the most common causes of P0232?
The most common causes of P0232 are: Faulty fuel pump relay (stuck or shorted), Short to voltage in the fuel pump control wiring, Failed fuel pump driver module, Corroded or damaged connectors in the circuit, Faulty fuel pump (internal short), Wiring chafed against the body or harness short, Faulty PCM/ECM (rare). The specific cause varies by vehicle.
How much does it cost to fix P0232 on a Subaru?
Repair costs vary widely with the root cause and Subaru model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.