P1238 on Volvo: How to Diagnose & Fix
Manufacturer-Specific Fuel/Injector System Fault
1 Volvo model · 1 documented issue · 1 critical · $350-$900 repair
P1238 on Volvo by model: symptoms, diagnosis and fix
The fuel pump electronic control module used on this generation can fail from heat, moisture, or internal electronics faults, leading to intermittent no-starts, sudden stalling, or extended cranking. This problem is documented across late-2000s/early-2010s P3 Volvos and appears in owner reports and service literature. Because the module controls pump speed and delivery, failure can mimic a bad in-tank fuel pump.
Common Symptoms
- extended crank before starting
- intermittent no-start
- engine stalls while driving
- loss of power under load
- fuel pressure too low
How to Fix
Confirm fuel pressure loss and scan for fuel pump communication or performance faults before replacing parts. Inspect the module and connectors for corrosion, then replace the fuel pump control module if command and power/ground are present but output is erratic. In some cases, software updates or connector repair are also needed.
Sources for this issue (1)
P1238 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 P1238 mean on a Volvo?
P1238 stands for "Manufacturer-Specific Fuel/Injector System Fault." P1238 is a manufacturer-specific powertrain code whose definition varies by maker, so it should be confirmed against model-specific data. Reported meanings include a fuel pump circuit/relay fault (Ford), a mechanical injector failure on some Toyota diesels, and a cylinder 2 injector circuit (open) fault on some Volkswagen/Audi applications. In general it points to a fuel-delivery or fuel-injector problem that can cause hard starting, stalling, misfire, and reduced power. On Volvo it is documented across 1 model: V70.
What are the most common causes of P1238?
The most common causes of P1238 are: Fuel pump circuit, relay, or driver fault (Ford), Faulty or open fuel injector / injector circuit (cylinder-specific, VW), Wiring, connector, or ground problems in the fuel circuit, Mechanical injector failure (some Toyota diesels), Fuel pump or fuel delivery weakness, Faulty PCM/ECM driver, Corroded or loose electrical connections. The specific cause varies by vehicle.
How much does it cost to fix P1238 on a Volvo?
Published repair estimates on Volvo range from $350 to $900 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P1238 on a different make?
View P1238 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.