P0337 on Saab: How to Diagnose & Fix
Crankshaft Position Sensor "A" Circuit Low Input
1 Saab model · 1 documented issue · 1 critical · $100-$350 repair
P0337 on Saab by model: symptoms, diagnosis and fix
The crankshaft position sensor on the first-generation 9-5 (B235 engine) is a very common failure item. As it degrades it tends to fail when the engine is hot, producing the classic 'hot no-start': the engine cranks but will not fire when warm, then restarts after cooling. It can also cause intermittent stalling while driving, a real safety concern.
Common Symptoms
- Hot no-start (cranks but won't start when warm)
- Intermittent stalling
- Restarts after cooling down
- Check engine light
How to Fix
Replace the crankshaft position sensor with an OEM/Bosch-quality part - cheap unbranded aftermarket sensors are reported to fail again within months. The sensor is relatively inexpensive but located awkwardly near the bell-housing.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Bosch OE-supplier crank position sensor 32101510 / Saab 55557326
Saab 9-5 1998-2009 B205/B235 four-cylinder and cataloged OG 9-3 applications; confirm VIN/engine. Not B308 V6 or later engines.
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Sources for this issue (3)
P0337 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 P0337 mean on a Saab?
P0337 stands for "Crankshaft Position Sensor "A" Circuit Low Input." The crankshaft position (CKP) sensor watches a toothed reluctor wheel on the crankshaft and tells the engine computer exactly how fast the crank is spinning and where each piston is, which the computer needs to time spark and fuel injection. P0337 sets when the computer sees the sensor's signal voltage stuck near zero — below the expected range — usually because the sensor has failed or its wiring is open, shorted to ground, or corroded. You may notice hard starting, an engine that cranks but won't start, rough idle, stalling, or reduced power and fuel economy; on many vehicles the engine simply won't run while the fault is present. Ignoring it risks being stranded by a sudden no-start or a stall in traffic, so it should be diagnosed promptly. On Saab it is documented across 1 model: 9-5.
What are the most common causes of P0337?
The most common causes of P0337 are: Failed crankshaft position sensor (the most common cause), Open, shorted-to-ground, or chafed wiring in the CKP sensor circuit, Loose, corroded, or damaged CKP sensor connector, Damaged, dirty, or missing-tooth reluctor (tone) ring on the crankshaft, Metal debris on the sensor's magnetic tip or incorrect sensor air gap, Low battery voltage or a weak starter producing an out-of-range signal during cranking, Faulty powertrain control module (rare). The specific cause varies by vehicle.
How much does it cost to fix P0337 on a Saab?
Published repair estimates on Saab range from $100 to $350 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.
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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.